Pub Date : 2025-07-16DOI: 10.1016/j.geotexmem.2025.07.007
Laura Ibagón , Bernardo Caicedo , Juan P. Villacreses , Fernando López‐Caballero
Washboard or corrugation is characterised by undulating patterns that emerge on unpaved roads as vehicles pass over. Soil properties, vehicle velocity, and mass influence these undulations. This study investigates the use of a cellular confinement system (geocells) placed at the road surface as a method to increase soil shear resistance. This approach aims to mitigate the formation of washboard undulations. A multi-pass experimental setup was employed to evaluate the reinforcement effect on the washboard phenomenon. The setup consists of a rotating wheel that traverses a sandy path, both with and without geocell reinforcement. Reinforced and non-reinforced results were compared under various scenarios, including wheel velocities and masses. Additionally, the effect of geocell confinement was compared with the effect of apparent cohesion using the theoretical model proposed by Ibagón et al. (2025). Findings showed that ripple formations are significantly reduced due to the geocell reinforcement. This suggests that geocells placed at the road surface may improve the durability and stability of unpaved roads under repeated vehicular loads.
{"title":"Mitigating washboard effect: A study on geocells as soil reinforcement for unpaved roads","authors":"Laura Ibagón , Bernardo Caicedo , Juan P. Villacreses , Fernando López‐Caballero","doi":"10.1016/j.geotexmem.2025.07.007","DOIUrl":"10.1016/j.geotexmem.2025.07.007","url":null,"abstract":"<div><div>Washboard or corrugation is characterised by undulating patterns that emerge on unpaved roads as vehicles pass over. Soil properties, vehicle velocity, and mass influence these undulations. This study investigates the use of a cellular confinement system (geocells) placed at the road surface as a method to increase soil shear resistance. This approach aims to mitigate the formation of washboard undulations. A multi-pass experimental setup was employed to evaluate the reinforcement effect on the washboard phenomenon. The setup consists of a rotating wheel that traverses a sandy path, both with and without geocell reinforcement. Reinforced and non-reinforced results were compared under various scenarios, including wheel velocities and masses. Additionally, the effect of geocell confinement was compared with the effect of apparent cohesion using the theoretical model proposed by Ibagón et al. (2025). Findings showed that ripple formations are significantly reduced due to the geocell reinforcement. This suggests that geocells placed at the road surface may improve the durability and stability of unpaved roads under repeated vehicular loads.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 6","pages":"Pages 1433-1445"},"PeriodicalIF":4.7,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144634095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-13DOI: 10.1016/j.geotexmem.2025.07.003
Peng Wang , Ming Li , Zhuoxuan Wu , Jun Wang , Guohui Yuan , Xianfeng Huang , Jianfeng Wu
Traditional vacuum preloading, electroosmotic techniques face challenges such as poor removal efficiency, reinforcement and high energy consumption when treating contaminated sludge with high water content. This study investigates the reinforcement and remediation of nickel (Ni)-contaminated sludge with high water content using an approach combining grouting, vacuum preloading, and electroosmosis (GVE). Through laboratory model tests, the effects of grouting agents, vacuum preloading, and voltage loading modes on Ni removal efficiency, soil reinforcement, and energy consumption were evaluated. The results demonstrate that the grouting of sodium alginate can chelate Ni2+ in the soil, facilitating the removal of heavy metal ions during the electroosmosis process. The GVE combined with vacuum preloading significantly enhances Ni removal rates, achieving up to 94.52 % compared to 65.11 % with electroosmosis alone. Additionally, GVE reduced soil water content to 30.34 % and increased shear strength to 98 kPa, indicating improved soil reinforcement. The step loading further reduced energy consumption by over 35 % compared to constant voltage loading while enhancing both soil remediation and reinforcement. This study concludes that GVE, particularly with step loading and intermittent loading, is an effective and energy-efficient method for remediating and reinforcing heavy metal contaminated sludge.
{"title":"Experimental study on reinforcement and remediation of nickel-contaminated sludge using grouting vacuum preloading combined with electroosmosis","authors":"Peng Wang , Ming Li , Zhuoxuan Wu , Jun Wang , Guohui Yuan , Xianfeng Huang , Jianfeng Wu","doi":"10.1016/j.geotexmem.2025.07.003","DOIUrl":"10.1016/j.geotexmem.2025.07.003","url":null,"abstract":"<div><div>Traditional vacuum preloading, electroosmotic techniques face challenges such as poor removal efficiency, reinforcement and high energy consumption when treating contaminated sludge with high water content. This study investigates the reinforcement and remediation of nickel (Ni)-contaminated sludge with high water content using an approach combining grouting, vacuum preloading, and electroosmosis (GVE). Through laboratory model tests, the effects of grouting agents, vacuum preloading, and voltage loading modes on Ni removal efficiency, soil reinforcement, and energy consumption were evaluated. The results demonstrate that the grouting of sodium alginate can chelate Ni<sup>2+</sup> in the soil, facilitating the removal of heavy metal ions during the electroosmosis process. The GVE combined with vacuum preloading significantly enhances Ni removal rates, achieving up to 94.52 % compared to 65.11 % with electroosmosis alone. Additionally, GVE reduced soil water content to 30.34 % and increased shear strength to 98 kPa, indicating improved soil reinforcement. The step loading further reduced energy consumption by over 35 % compared to constant voltage loading while enhancing both soil remediation and reinforcement. This study concludes that GVE, particularly with step loading and intermittent loading, is an effective and energy-efficient method for remediating and reinforcing heavy metal contaminated sludge.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 6","pages":"Pages 1423-1432"},"PeriodicalIF":4.7,"publicationDate":"2025-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144611789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-12DOI: 10.1016/j.geotexmem.2025.07.004
Yupeng Cao , Xinzhuang Cui , Zhehao Qiu , Jie Yin , Pengfei Qi , Shuo Sun
This study investigates the dewatering and reinforcement performance of high-water-content dredged slurry using vacuum preloading combined with superabsorbent polymer (SAP) as a flocculant. Preliminary sedimentation experiments were conducted to compare the dewatering performance of different flocculants, and SAP was identified as the most effective additive for enhancing sedimentation. Laboratory vacuum preloading model tests were conducted on dredged clay treated with SAP and prefabricated vertical drain (PVD), to evaluate the effectiveness of SAP in enhancing the dewatering process. Results show that SAP enhances vacuum efficiency, leading to higher and faster vacuum pressure stabilization near the PVD. SAP-treated samples exhibited more rapid pore water pressure dissipation and accelerated water content reduction, particularly in the early stages. Post-treatment water content increased with distance from the PVD, but SAP improved overall drainage uniformity. Vane shear strength decreased with distance from the PVD but remained higher in SAP-treated samples, showing a linear correlation with normalized water content. SAP also influenced soil column formation, expanding its effective radius and reducing stabilization time. Two quantitative models were developed to predict shear strength and soil column radius variations under vacuum preloading with and without SAP. The radius of the soil column formed during vacuum preloading varied with depth, decreasing towards the bottom and increasing towards the surface. These findings provide valuable insights for optimizing vacuum preloading in dredged material treatment and soft soil improvement.
{"title":"Investigation on dewatering and reinforcement of dredged clay treated with SAP and PVD under vacuum preloading","authors":"Yupeng Cao , Xinzhuang Cui , Zhehao Qiu , Jie Yin , Pengfei Qi , Shuo Sun","doi":"10.1016/j.geotexmem.2025.07.004","DOIUrl":"10.1016/j.geotexmem.2025.07.004","url":null,"abstract":"<div><div>This study investigates the dewatering and reinforcement performance of high-water-content dredged slurry using vacuum preloading combined with superabsorbent polymer (SAP) as a flocculant. Preliminary sedimentation experiments were conducted to compare the dewatering performance of different flocculants, and SAP was identified as the most effective additive for enhancing sedimentation. Laboratory vacuum preloading model tests were conducted on dredged clay treated with SAP and prefabricated vertical drain (PVD), to evaluate the effectiveness of SAP in enhancing the dewatering process. Results show that SAP enhances vacuum efficiency, leading to higher and faster vacuum pressure stabilization near the PVD. SAP-treated samples exhibited more rapid pore water pressure dissipation and accelerated water content reduction, particularly in the early stages. Post-treatment water content increased with distance from the PVD, but SAP improved overall drainage uniformity. Vane shear strength decreased with distance from the PVD but remained higher in SAP-treated samples, showing a linear correlation with normalized water content. SAP also influenced soil column formation, expanding its effective radius and reducing stabilization time. Two quantitative models were developed to predict shear strength and soil column radius variations under vacuum preloading with and without SAP. The radius of the soil column formed during vacuum preloading varied with depth, decreasing towards the bottom and increasing towards the surface. These findings provide valuable insights for optimizing vacuum preloading in dredged material treatment and soft soil improvement.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 6","pages":"Pages 1407-1422"},"PeriodicalIF":4.7,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144604380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-10DOI: 10.1016/j.geotexmem.2025.06.009
Zhilang You , Jian Xu , Hua Liu , Zhichao Zhang , Yang Peng
The effectiveness of a self-developed wicking geotextile under different freezing-thawing cycles (0, 1, 3, 5, 10) in draining water from the coarse-grained railways soils with varying initial water contents (12 %, 15 %, 18 %, and 21 %) and fine contents (5 %, 10 %, 15 %, 20 %, 30 %) was evaluated using a series of vertical wicking tests. Results show that: 1) the wicking geotextile demonstrated efficient vertical water drainage from coarse-grained soils, with its performance significantly influenced by soil properties (initial water content and fine content) and freezing-thawing cycles; 2) the maximum liquid vertical wicking heights (LVWHs) of the wicking geotextiles in the coarse-grained soils increased with the increasing initial water contents but decreased with the increasing fine contents; 3) with the increase in freezing-thawing cycles, the maximum LVWHs of the wicking geotextiles in coarse-grained soils demonstrated a two-stage decline (first decreasing rapidly, then slowing down) before stabilizing at a constant value. Based on the microstructures, the mechanisms by which the initial water contents, fine contents, and freezing-thawing cycles affected the wicking performance were qualitatively analyzed and discussed. This study contributes to frost heave prevention of coarse-grained soils in cold regions.
{"title":"Experimental study on the wicking performance of a wicking geotextile in coarse-grained soils under freezing-thawing actions","authors":"Zhilang You , Jian Xu , Hua Liu , Zhichao Zhang , Yang Peng","doi":"10.1016/j.geotexmem.2025.06.009","DOIUrl":"10.1016/j.geotexmem.2025.06.009","url":null,"abstract":"<div><div>The effectiveness of a self-developed wicking geotextile under different freezing-thawing cycles (0, 1, 3, 5, 10) in draining water from the coarse-grained railways soils with varying initial water contents (12 %, 15 %, 18 %, and 21 %) and fine contents (5 %, 10 %, 15 %, 20 %, 30 %) was evaluated using a series of vertical wicking tests. Results show that: 1) the wicking geotextile demonstrated efficient vertical water drainage from coarse-grained soils, with its performance significantly influenced by soil properties (initial water content and fine content) and freezing-thawing cycles; 2) the maximum liquid vertical wicking heights (LVWHs) of the wicking geotextiles in the coarse-grained soils increased with the increasing initial water contents but decreased with the increasing fine contents; 3) with the increase in freezing-thawing cycles, the maximum LVWHs of the wicking geotextiles in coarse-grained soils demonstrated a two-stage decline (first decreasing rapidly, then slowing down) before stabilizing at a constant value. Based on the microstructures, the mechanisms by which the initial water contents, fine contents, and freezing-thawing cycles affected the wicking performance were qualitatively analyzed and discussed. This study contributes to frost heave prevention of coarse-grained soils in cold regions.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 6","pages":"Pages 1388-1406"},"PeriodicalIF":4.7,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-08DOI: 10.1016/j.geotexmem.2025.06.008
Weiting Deng , Xuanming Ding , Chunyan Wang , Changwei Yang , Zhenhua Ren , Qiang Ou , Ren Wang
This study investigated the seismic response and reinforcement mechanism of high-fill embankment reinforced with geogrid and pile-slab structure through shaking table tests and numerical method. Experimental results demonstrated that the geogrid-reinforced composite embankment can still maintain structural integrity under high-intensity seismic loading (PGA ≥0.8g), exhibiting only surface cracking and localized soil extrusion. The acceleration amplification factor (AAF) exhibited both “elevation effect” and “surface tendency effect”, while strain distribution in the pile-slab structure followed characteristic arch-shaped and M-shaped patterns. Geogrid reinforcement effectively constrained soil deformation and redistributed stresses, delaying the development of pile bending moment and embankment displacement. Its reinforcement efficiency increased with seismic intensity. Validated numerical models reproduced shear strain localization-induced cracking at both embankment surfaces and embankment-accumulation interfaces. Shear strain propagation exhibited a progressive inward expansion from the embankment surface under seismic excitation. Parametric studies further revealed that reducing geogrid spacing can improve constraint effects, minimize displacement, and mitigate internal shear deformation. These findings underscore the synergistic role of geogrids and pile-slab structures in redistributing seismic thrust forces, offering critical insights for optimizing reinforcement strategies in seismically active regions.
{"title":"Experimental and numerical analysis of wrapped geogrid-stabilized high-fill embankment: Seismic response and composite reinforcement mechanisms","authors":"Weiting Deng , Xuanming Ding , Chunyan Wang , Changwei Yang , Zhenhua Ren , Qiang Ou , Ren Wang","doi":"10.1016/j.geotexmem.2025.06.008","DOIUrl":"10.1016/j.geotexmem.2025.06.008","url":null,"abstract":"<div><div>This study investigated the seismic response and reinforcement mechanism of high-fill embankment reinforced with geogrid and pile-slab structure through shaking table tests and numerical method. Experimental results demonstrated that the geogrid-reinforced composite embankment can still maintain structural integrity under high-intensity seismic loading (PGA ≥0.8g), exhibiting only surface cracking and localized soil extrusion. The acceleration amplification factor (AAF) exhibited both “elevation effect” and “surface tendency effect”, while strain distribution in the pile-slab structure followed characteristic arch-shaped and M-shaped patterns. Geogrid reinforcement effectively constrained soil deformation and redistributed stresses, delaying the development of pile bending moment and embankment displacement. Its reinforcement efficiency increased with seismic intensity. Validated numerical models reproduced shear strain localization-induced cracking at both embankment surfaces and embankment-accumulation interfaces. Shear strain propagation exhibited a progressive inward expansion from the embankment surface under seismic excitation. Parametric studies further revealed that reducing geogrid spacing can improve constraint effects, minimize displacement, and mitigate internal shear deformation. These findings underscore the synergistic role of geogrids and pile-slab structures in redistributing seismic thrust forces, offering critical insights for optimizing reinforcement strategies in seismically active regions.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 6","pages":"Pages 1357-1374"},"PeriodicalIF":4.7,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144571598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-08DOI: 10.1016/j.geotexmem.2025.07.002
Jun Wang , Chenglong Gu , Xiaobing Li , Hongtao Fu , Junfeng Ni , Ziyang Gao , Long Wang
In the combined method of horizontal drainage board vacuum preloading and sealed geomembrane bags, the horizontal drainage board serves as the sole drainage channel, making its diameter coefficient critical in determining the appropriate filling height. Based on the theoretical model for vertical drainage boards, this study analyzes the influence range of a horizontal drainage board using the sealed geomembrane bag method. Model tests show that the maximum influence diameter coefficient of the horizontal drainage board lies between 24.6 and 25.3. By referencing the minimum influence diameter coefficient typically used for vertical drains, the applicable range for horizontal drainage boards in sealed geomembrane bags is suggested to be 15.0 to 25.3. Results also reveal that the upper slurry layer drains more efficiently than the lower layer due to gravity-assisted downward flow. In contrast, upward drainage in the lower zone is less effective. Adding a drainage board at the bottom creates a direct flow path and improves consolidation in the lower zone. To mitigate clogging during testing, the drainage board was embedded in geotextile, which reduced clogging to some extent. However, as clogging is difficult to avoid in practice, the proposed coefficient does not account for its effects.
{"title":"Experimental analysis of the influence of drainage board diameter coefficient on sludge treatment combining horizontal drain-vacuum preloading with geomembrane bags","authors":"Jun Wang , Chenglong Gu , Xiaobing Li , Hongtao Fu , Junfeng Ni , Ziyang Gao , Long Wang","doi":"10.1016/j.geotexmem.2025.07.002","DOIUrl":"10.1016/j.geotexmem.2025.07.002","url":null,"abstract":"<div><div>In the combined method of horizontal drainage board vacuum preloading and sealed geomembrane bags, the horizontal drainage board serves as the sole drainage channel, making its diameter coefficient critical in determining the appropriate filling height. Based on the theoretical model for vertical drainage boards, this study analyzes the influence range of a horizontal drainage board using the sealed geomembrane bag method. Model tests show that the maximum influence diameter coefficient of the horizontal drainage board lies between 24.6 and 25.3. By referencing the minimum influence diameter coefficient typically used for vertical drains, the applicable range for horizontal drainage boards in sealed geomembrane bags is suggested to be 15.0 to 25.3. Results also reveal that the upper slurry layer drains more efficiently than the lower layer due to gravity-assisted downward flow. In contrast, upward drainage in the lower zone is less effective. Adding a drainage board at the bottom creates a direct flow path and improves consolidation in the lower zone. To mitigate clogging during testing, the drainage board was embedded in geotextile, which reduced clogging to some extent. However, as clogging is difficult to avoid in practice, the proposed coefficient does not account for its effects.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 6","pages":"Pages 1375-1387"},"PeriodicalIF":4.7,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144581417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Geotextile filter layers are extensively utilized in revetment structures for riverbanks, floodwalls, and dams. These structures are often located in complex hydraulic environments, so geotextile filter layers may be subject to long-term cyclic flows. In this study, based on a self-developed gradient ratio test device, a series of gradient ratio tests under different hydraulic gradients and normal stresses were carried out to investigate the filtration characteristics and mechanisms of soil-geotextile systems under cyclic flow. The results show that the risk of particle erosion under cyclic flow is greater than the risk of system clogging, and the magnitude of hydraulic gradient and normal stress have an important influence on the filtration behavior. The boundary scour effect caused by the cyclic flow is proportional to the hydraulic gradient, while the normal stress enhances the retention of the soil through the benign geotextile blockage effect. The corresponding visual inspection analyses reveal that stable arching structures can be formed near the filter interface under cyclic flow, thus mechanically enhancing the stability of the system. These mechanisms suggest that strategic adjustments of the overburden pressure can optimize the structural stability of the soil-geotextile system in flood-prone environments.
{"title":"Filtration characteristics and mechanism of geotextile filters under cyclic flow","authors":"Feifan Ren , Zhipeng Hu , Yuan Gao , Qiangqiang Huang , Xiaorui Qian","doi":"10.1016/j.geotexmem.2025.07.001","DOIUrl":"10.1016/j.geotexmem.2025.07.001","url":null,"abstract":"<div><div>Geotextile filter layers are extensively utilized in revetment structures for riverbanks, floodwalls, and dams. These structures are often located in complex hydraulic environments, so geotextile filter layers may be subject to long-term cyclic flows. In this study, based on a self-developed gradient ratio test device, a series of gradient ratio tests under different hydraulic gradients and normal stresses were carried out to investigate the filtration characteristics and mechanisms of soil-geotextile systems under cyclic flow. The results show that the risk of particle erosion under cyclic flow is greater than the risk of system clogging, and the magnitude of hydraulic gradient and normal stress have an important influence on the filtration behavior. The boundary scour effect caused by the cyclic flow is proportional to the hydraulic gradient, while the normal stress enhances the retention of the soil through the benign geotextile blockage effect. The corresponding visual inspection analyses reveal that stable arching structures can be formed near the filter interface under cyclic flow, thus mechanically enhancing the stability of the system. These mechanisms suggest that strategic adjustments of the overburden pressure can optimize the structural stability of the soil-geotextile system in flood-prone environments.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 6","pages":"Pages 1343-1356"},"PeriodicalIF":4.7,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144570912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-03DOI: 10.1016/j.geotexmem.2025.06.006
Shuai Qin , Chenyao Guo , Jingwei Wu , Shuai He , Haoyu Yang , Chenzhi Yao , Xinman Jiang , Hang Li
This study investigates the morphological characteristics, development process, and impact on permeability of physical-chemical combined clogging on geotextile envelopes, through laboratory experiments involving particle flow coupled with chemical precipitation. The results show that there is a synergistic effect between physical clogging caused by soil particle accumulation and chemical clogging due to salt precipitation. Chemical precipitation exacerbates physical clogging, while physical clogging promotes the formation of chemical precipitation. The chemical precipitates on the upstream of the geotextile envelope binds the particles to each other and to the fibers of the geotextile envelope, while on the downstream, precipitates tends to encapsulate the fibers, with less physical clogging. After combined clogging, the permeability coefficient of the geotextile envelope decreases rapidly with the increasing of the clogging material, and then decreases slowly. When the area density of the clogging material is less than 91.02 g/m2, it shows a linear decrease, and then followed by a logarithmic decrease. Physical-chemical combined clogging is more severe than single physical or chemical clogging. After the permeability stabilizes, for the same clogging mass, the decrease in permeability caused by combined clogging is 1.2 times and 2 times greater than that caused by physical and chemical clogging, respectively.
{"title":"The effect of physical-chemical combined clogging on the area density and permeability of geotextile envelopes for subsurface drainage systems in arid regions","authors":"Shuai Qin , Chenyao Guo , Jingwei Wu , Shuai He , Haoyu Yang , Chenzhi Yao , Xinman Jiang , Hang Li","doi":"10.1016/j.geotexmem.2025.06.006","DOIUrl":"10.1016/j.geotexmem.2025.06.006","url":null,"abstract":"<div><div>This study investigates the morphological characteristics, development process, and impact on permeability of physical-chemical combined clogging on geotextile envelopes, through laboratory experiments involving particle flow coupled with chemical precipitation. The results show that there is a synergistic effect between physical clogging caused by soil particle accumulation and chemical clogging due to salt precipitation. Chemical precipitation exacerbates physical clogging, while physical clogging promotes the formation of chemical precipitation. The chemical precipitates on the upstream of the geotextile envelope binds the particles to each other and to the fibers of the geotextile envelope, while on the downstream, precipitates tends to encapsulate the fibers, with less physical clogging. After combined clogging, the permeability coefficient of the geotextile envelope decreases rapidly with the increasing of the clogging material, and then decreases slowly. When the area density of the clogging material is less than 91.02 g/m<sup>2</sup>, it shows a linear decrease, and then followed by a logarithmic decrease. Physical-chemical combined clogging is more severe than single physical or chemical clogging. After the permeability stabilizes, for the same clogging mass, the decrease in permeability caused by combined clogging is 1.2 times and 2 times greater than that caused by physical and chemical clogging, respectively.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 6","pages":"Pages 1332-1342"},"PeriodicalIF":4.7,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144535539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A significant amount of sludge is generated worldwide every day, characterized by its high moisture content. This study investigates the impact of freeze-thaw cycles and step vacuum preloading on sludge dewatering and volume reduction. It also analyzes the effects of different loading methods to address challenges associated with sludge dewatering. Based on Hansbo's consolidation theory, equations for excess pore water pressure and the degree of consolidation under step vacuum loading are derived, and the experimental results are predicted. A conversion coefficient, r, was introduced to measure the degree of clogging in the drainage board. The results indicate that step vacuum loading is more effective for sludge drainage and volume reduction. Additionally, the theoretical predictions accurately reflect the experimental outcomes, providing a solid theoretical foundation for the feasibility of employing step vacuum preloading in engineering applications.
{"title":"Analytical solution of freeze-thaw pretreatment combined with step vacuum preloading for sludge consolidation and dewatering","authors":"Xudong Zhang , Zhenggao Xu , Yajun Wu , Peng Ye , Xueke Zang , Jinhong Wu","doi":"10.1016/j.geotexmem.2025.06.005","DOIUrl":"10.1016/j.geotexmem.2025.06.005","url":null,"abstract":"<div><div>A significant amount of sludge is generated worldwide every day, characterized by its high moisture content. This study investigates the impact of freeze-thaw cycles and step vacuum preloading on sludge dewatering and volume reduction. It also analyzes the effects of different loading methods to address challenges associated with sludge dewatering. Based on Hansbo's consolidation theory, equations for excess pore water pressure and the degree of consolidation under step vacuum loading are derived, and the experimental results are predicted. A conversion coefficient, r, was introduced to measure the degree of clogging in the drainage board. The results indicate that step vacuum loading is more effective for sludge drainage and volume reduction. Additionally, the theoretical predictions accurately reflect the experimental outcomes, providing a solid theoretical foundation for the feasibility of employing step vacuum preloading in engineering applications.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 6","pages":"Pages 1299-1313"},"PeriodicalIF":4.7,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-06-30DOI: 10.1016/j.geotexmem.2025.06.007
Hani Meree , Dongpo Wang , Shuaixing Yan , Stéphane Lambert , Yanhao Chen , Qi Dong
Orthogonal Experimental Design (OED) and Response Surface Methodology (RSM) optimized waste Expanded Polystyrene (EPS) bead-sand composite cushions, identifying an optimal EPS content of 38.79 % by volume for superior energy absorption and load distribution. The novel SE-S-F layered configuration (EPS-sand mixture over pure sand) reduced RC slab tension damage by 79.7 % compared to traditional sand cushions and crack width by 92.3 % relative to the EPS-sand mixture, surpassing monolithic designs. It minimized transmitted forces, accelerations, and energy dissipation while promoting flexural cracking for enhanced structural protection. Validated numerical simulations accurately modeled impact dynamics, enabling reliable performance predictions. Successive impact tests confirmed the SE-S-F configuration's multi-impact resistance, achieving a non-dimensional factor (Ω) of 1.47 by the fifth impact, outperforming geofoam-based designs. Repurposing waste EPS, this approach delivers lightweight, sustainable, and cost-effective rockfall protection systems, enhancing safety in mountainous regions and transportation corridors.
{"title":"Optimization and performance analysis of novel waste EPS bead-sand composite cushions for rockfall mitigation: An integrated experimental and numerical study","authors":"Hani Meree , Dongpo Wang , Shuaixing Yan , Stéphane Lambert , Yanhao Chen , Qi Dong","doi":"10.1016/j.geotexmem.2025.06.007","DOIUrl":"10.1016/j.geotexmem.2025.06.007","url":null,"abstract":"<div><div>Orthogonal Experimental Design (OED) and Response Surface Methodology (RSM) optimized waste Expanded Polystyrene (EPS) bead-sand composite cushions, identifying an optimal EPS content of 38.79 % by volume for superior energy absorption and load distribution. The novel SE-S-F layered configuration (EPS-sand mixture over pure sand) reduced RC slab tension damage by 79.7 % compared to traditional sand cushions and crack width by 92.3 % relative to the EPS-sand mixture, surpassing monolithic designs. It minimized transmitted forces, accelerations, and energy dissipation while promoting flexural cracking for enhanced structural protection. Validated numerical simulations accurately modeled impact dynamics, enabling reliable performance predictions. Successive impact tests confirmed the SE-S-F configuration's multi-impact resistance, achieving a non-dimensional factor (Ω) of 1.47 by the fifth impact, outperforming geofoam-based designs. Repurposing waste EPS, this approach delivers lightweight, sustainable, and cost-effective rockfall protection systems, enhancing safety in mountainous regions and transportation corridors.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 6","pages":"Pages 1314-1331"},"PeriodicalIF":4.7,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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