Geotextiles and Geomembranes最新文献_第9页

Model tests on wicking geosynthetic composite reinforced bases over weak subgrade 软弱地基上吸湿土工合成复合材料加筋地基模型试验

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-03-28 DOI: 10.1016/j.geotexmem.2025.03.006

Minghao Liu , Jiming Liu , Sam Bhat , Yongxuan Gao , Cheng Lin

Road performance is significantly enhanced by incorporating geosynthetics through their reinforcement and drainage functions. This study introduces a novel geosynthetic that integrates these functions. It is made of biaxial polypropylene geogrids heat-bonded to wicking nonwoven geotextiles (WNWGs). WNWGs are chemically treated to be hydrophilic and thus possess rapid wetting and wicking properties while preserving the large lateral drainage functionality of conventional nonwoven geotextiles. To assess the combined reinforcement and drainage performance of this material, a series of model tests including rainfall simulation and plate loading tests were performed on the WNWG-geogrid composite reinforced bases over weak subgrade using a customized model test apparatus. The results confirmed that the inclusion of wicking geosynthetic composite significantly enhanced drainage, stiffness, and bearing capacity of road bases compared to the conventional nonwoven geotextile-geogrid reinforcement and the unreinforced condition. The modulus improvement factor (MIF) for this wicking composite was 2.74 as compared to 1.46 for the conventional nonwoven geotextile-geogrid reinforcement. The findings from this study demonstrate the promising performance of this new composite and provide a valuable reference for full-scale tests and applications on roads.

土工合成材料的加固和排水功能大大提高了道路性能。本研究介绍了一种集成了这些功能的新型土工合成材料。它是由双轴聚丙烯土工格栅热粘合到吸芯非织造土工布（WNWGs）。WNWGs经过化学处理，具有亲水性，因此具有快速润湿和排芯性能，同时保留了传统非织造土工布的大侧向排水功能。为了评估该材料的综合配筋和排水性能，使用定制的模型试验装置对弱路基上的wnwg -土工格栅复合地基进行了降雨模拟和板载试验等一系列模型试验。结果证实，与常规非织造土工布-土工格栅加固和未加筋条件相比，加入吸芯土工合成复合材料显著提高了道路基层的排水能力、刚度和承载能力。这种吸芯复合材料的模量改善系数（MIF）为2.74，而传统的非织造土工布-土工格栅增强材料的模量改善系数为1.46。研究结果证明了这种新型复合材料的良好性能，并为全面测试和道路应用提供了有价值的参考。

{"title":"Model tests on wicking geosynthetic composite reinforced bases over weak subgrade","authors":"Minghao Liu , Jiming Liu , Sam Bhat , Yongxuan Gao , Cheng Lin","doi":"10.1016/j.geotexmem.2025.03.006","DOIUrl":"10.1016/j.geotexmem.2025.03.006","url":null,"abstract":"<div><div>Road performance is significantly enhanced by incorporating geosynthetics through their reinforcement and drainage functions. This study introduces a novel geosynthetic that integrates these functions. It is made of biaxial polypropylene geogrids heat-bonded to wicking nonwoven geotextiles (WNWGs). WNWGs are chemically treated to be hydrophilic and thus possess rapid wetting and wicking properties while preserving the large lateral drainage functionality of conventional nonwoven geotextiles. To assess the combined reinforcement and drainage performance of this material, a series of model tests including rainfall simulation and plate loading tests were performed on the WNWG-geogrid composite reinforced bases over weak subgrade using a customized model test apparatus. The results confirmed that the inclusion of wicking geosynthetic composite significantly enhanced drainage, stiffness, and bearing capacity of road bases compared to the conventional nonwoven geotextile-geogrid reinforcement and the unreinforced condition. The modulus improvement factor (MIF) for this wicking composite was 2.74 as compared to 1.46 for the conventional nonwoven geotextile-geogrid reinforcement. The findings from this study demonstrate the promising performance of this new composite and provide a valuable reference for full-scale tests and applications on roads.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 4","pages":"Pages 938-949"},"PeriodicalIF":4.7,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Critical state mechanics-based arching model for pile-supported embankments 基于临界状态力学的桩基路堤拱模型

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-03-26 DOI: 10.1016/j.geotexmem.2025.03.002

Tuan A. Pham , Abdollah Tabaroei , Daniel Dias , Jie Han

The study and application of soil arching theory in geosynthetic-reinforced pile-supported (GRPS) embankments have gained increasing attention, as accurate arching estimation significantly influences load-deflection behavior of structures. While most existing models rely on Rankine's earth pressure theory, which applies primarily to granular soils and neglects cohesion effects. This paper employs three-dimensional numerical simulations to examine the impact of soil cohesion on soil arching mechanisms in pile-supported embankments. Results indicate that cohesion enhances load transfer to piles, with arching efficacy increasing nonlinearly before stabilizing at higher cohesion values. Building on these findings, the ground reaction curve (GRC) model is proposed to predict arching behavior in both cohesive and non-cohesive embankments at various deformation stages. By integrating critical state soil mechanics with the concentric arch model, the transition between maximum and critical arching states is captured through changes in the mobilized friction angle with relative displacement. Model validation against two well-instrumented case studies demonstrates its accuracy, particularly in accounting for soil cohesion. Moreover, the maximum arching model better predicts GRPS embankments under small deformations (relative displacement <4 %), while the critical arching model is more suitable for large deformations (relative displacement >6 %). The proposed model effectively captures arching behavior improvements in both cohesive and non-cohesive soils.

土拱理论在土工合成桩支撑（GRPS）路堤中的研究和应用越来越受到重视，因为准确的土拱估算对结构的荷载-挠曲行为有重要影响。而现有的大多数模型依赖于Rankine土压力理论，该理论主要适用于颗粒土而忽略了粘聚效应。本文采用三维数值模拟的方法研究了土体粘聚力对桩基路堤土拱机制的影响。结果表明：粘聚力增强了荷载向桩的传递，在较高的粘聚力值下，拱效率呈非线性增长，趋于稳定；在此基础上，提出了地基反力曲线（GRC）模型来预测粘性和非粘性路堤在不同变形阶段的拱行为。将临界状态土力学与同心拱模型相结合，通过动员摩擦角随相对位移的变化来捕捉最大拱状态与临界拱状态之间的过渡。模型验证对两个良好的仪器案例研究证明了其准确性，特别是在考虑土壤凝聚力。最大拱模型较好地预测了小变形（相对位移>； 4%）下的GRPS路堤，而临界拱模型更适合于大变形（相对位移>； 6%）下的GRPS路堤。所提出的模型有效地捕捉了粘性和非粘性土壤中拱行为的改善。

{"title":"Critical state mechanics-based arching model for pile-supported embankments","authors":"Tuan A. Pham , Abdollah Tabaroei , Daniel Dias , Jie Han","doi":"10.1016/j.geotexmem.2025.03.002","DOIUrl":"10.1016/j.geotexmem.2025.03.002","url":null,"abstract":"<div><div>The study and application of soil arching theory in geosynthetic-reinforced pile-supported (GRPS) embankments have gained increasing attention, as accurate arching estimation significantly influences load-deflection behavior of structures. While most existing models rely on Rankine's earth pressure theory, which applies primarily to granular soils and neglects cohesion effects. This paper employs three-dimensional numerical simulations to examine the impact of soil cohesion on soil arching mechanisms in pile-supported embankments. Results indicate that cohesion enhances load transfer to piles, with arching efficacy increasing nonlinearly before stabilizing at higher cohesion values. Building on these findings, the ground reaction curve (GRC) model is proposed to predict arching behavior in both cohesive and non-cohesive embankments at various deformation stages. By integrating critical state soil mechanics with the concentric arch model, the transition between maximum and critical arching states is captured through changes in the mobilized friction angle with relative displacement. Model validation against two well-instrumented case studies demonstrates its accuracy, particularly in accounting for soil cohesion. Moreover, the maximum arching model better predicts GRPS embankments under small deformations (relative displacement <4 %), while the critical arching model is more suitable for large deformations (relative displacement >6 %). The proposed model effectively captures arching behavior improvements in both cohesive and non-cohesive soils.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 4","pages":"Pages 909-937"},"PeriodicalIF":4.7,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Consolidation of slurry treated by PHDs-VP incorporating development process of clogged zone 含堵塞区发展过程的ph - vp处理浆体固结

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-03-22 DOI: 10.1016/j.geotexmem.2025.03.003

Kang Yang , Mengmeng Lu , Kuo Li , Xiusong Shi

The prefabricated horizontal drains combined with vacuum preloading (PHDs-VP) method exhibits significant benefits in dredged slurry treatment. This study introduces an analytical model of slurry consolidation treated by PHDs-VP. In this model, the PHD is treated as a permeable boundary with a vacuum pressure. The governing equations are established by dividing the analytical unit into normal zone and clogged zone, and by incorporating the development process of the clogged zone. Numerical solutions are obtained utilizing the finite difference method. The accuracy and reliability of the solutions are validated through both degradation analysis and experimental verification. Furthermore, a parametrical analysis is conducted to investigate the influence of several key parameters on consolidation behavior. The results indicate that the clogging effect significantly retards the consolidation process, with a lower permeability coefficient or a greater thickness of the clogged zone resulting in a more pronounced reduction in the consolidation rate. Additionally, the consolidation rate decreases with the accelerated development of the clogged zone, and this effect becomes more pronounced with denser PHDs layout.

预制水平排水管结合真空预压（ph - vp）方法在疏浚泥浆处理中具有显著的效果。介绍了ph - vp处理浆体固结的分析模型。在该模型中，将PHD视为具有真空压力的可渗透边界。将分析单元划分为正常区和堵塞区，结合堵塞区的发展过程，建立了控制方程。利用有限差分法得到了数值解。通过退化分析和实验验证，验证了解的准确性和可靠性。此外，还进行了参数分析，探讨了几个关键参数对固结行为的影响。结果表明：堵塞效应显著延缓了固结过程，渗透系数越低或堵塞区厚度越大，固结速率降低越明显；此外，固结速率随着堵塞区发育的加快而降低，并且随着博士层的密集，这种影响更加明显。

{"title":"Consolidation of slurry treated by PHDs-VP incorporating development process of clogged zone","authors":"Kang Yang , Mengmeng Lu , Kuo Li , Xiusong Shi","doi":"10.1016/j.geotexmem.2025.03.003","DOIUrl":"10.1016/j.geotexmem.2025.03.003","url":null,"abstract":"<div><div>The prefabricated horizontal drains combined with vacuum preloading (PHDs-VP) method exhibits significant benefits in dredged slurry treatment. This study introduces an analytical model of slurry consolidation treated by PHDs-VP. In this model, the PHD is treated as a permeable boundary with a vacuum pressure. The governing equations are established by dividing the analytical unit into normal zone and clogged zone, and by incorporating the development process of the clogged zone. Numerical solutions are obtained utilizing the finite difference method. The accuracy and reliability of the solutions are validated through both degradation analysis and experimental verification. Furthermore, a parametrical analysis is conducted to investigate the influence of several key parameters on consolidation behavior. The results indicate that the clogging effect significantly retards the consolidation process, with a lower permeability coefficient or a greater thickness of the clogged zone resulting in a more pronounced reduction in the consolidation rate. Additionally, the consolidation rate decreases with the accelerated development of the clogged zone, and this effect becomes more pronounced with denser PHDs layout.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 4","pages":"Pages 897-908"},"PeriodicalIF":4.7,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682583","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}

引用次数: 0

The effect of a bench on leakage through a cover: A field and numerical assessment 台架对盖层渗漏的影响：现场与数值评估

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-03-15 DOI: 10.1016/j.geotexmem.2025.02.005

Y.H. Fan , R. Kerry Rowe , R.W.I. Brachman , Jamie F. VanGulck

Field experiments are conducted to quantify the leakage through an 11-mm-diameter hole in the liner on slopes with and without a bench under waste cover conditions. Over 14 months, with a total precipitation of 947 mm, a 0.68 m bench on a 4H: 1V slope results in a 43-fold increase in leakage (from 6.5 L to 282 L) compared to the reference section without a bench. Substantial leakage is attributed to snowmelt occurring at low temperatures. 3D numerical modelling is conducted and shows good agreement with the measured leakage induced by both rainfall and snowmelt. Parametric studies are conducted to further analyze the impact of hole locations, slope length, and slope gradient on leakage. The validated numerical model is used to predict potential leakage in a real case scenario, which features benches formed by differential settlement observed after 3-year service as a landfill cover. This paper contributes to enhancing leakage prediction so as to optimize the design of slope and bench configurations in waste covers.

通过现场试验，量化了垃圾覆盖条件下，在有垫层和没有垫层的斜坡上，衬里直径11 mm孔的泄漏量。在14个月的时间里，总降水量为947毫米，在4H: 1V的斜坡上，0.68米的工作台与没有工作台的参考区域相比，漏水量增加了43倍（从6.5升增加到282升）。大量泄漏归因于低温下发生的融雪。三维数值模拟结果与实测的降水和融雪引起的渗漏量吻合较好。进行参数化研究，进一步分析孔位、坡长、坡坡度对渗漏的影响。验证的数值模型用于预测实际情况下的潜在泄漏，其特征是作为垃圾填埋场覆盖3年后观测到的差异沉降形成的长凳。本文有助于加强渗漏预测，从而优化垃圾填埋场坡面和台架配置的设计。

引用次数: 0

Shear behavior of saline soil-geotextile interfaces under freeze-thaw cycles 冻融循环作用下盐渍土-土工织物界面剪切特性

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-03-10 DOI: 10.1016/j.geotexmem.2025.03.001

Junli Gao, Lai Pan, Feiyu Liu, Yan Yang

Volume changes in soil caused by freeze-thaw cycles can affect the shear performance of the saline soil-geotextile interface. To investigate this issue, the study examined changes in shear strength, deformation characteristics, and failure modes of the saline soil-geotextile interface under different numbers of freeze-thaw cycles. The experimental results indicate that with the increase in freeze-thaw cycles, the shear stiffness of the interface initially increases and then decreases, demonstrating the reduction in elasticity and resistance to deformation caused by freeze-thaw cycles. And the enhancement of normal stress can effectively increase the density of the soil and the adhesion at the interface, thereby improving shear stiffness. Meanwhile, the salt content in the soil also significantly impacts the mechanical properties, with notable changes in the dynamic characteristics of the interface as the salt content varies. Furthermore, after freeze-thaw actions, the soil becomes loose, reduces in integrity, features uneven surfaces, and sees increased internal porosity leading to slip surfaces. Trend analysis from this study provides new insights into the failure mechanisms at the saline soil-geotextile interface.

冻融循环引起的土体体积变化会影响盐渍土-土工织物界面的抗剪性能。为此，研究了不同冻融循环次数下盐渍土-土工织物界面抗剪强度、变形特征和破坏模式的变化。试验结果表明，随着冻融循环次数的增加，界面剪切刚度先增大后减小，表明冻融循环导致的弹性和抗变形能力降低。法向应力的增强可以有效地增加土的密度和界面黏附，从而提高抗剪刚度。同时，土壤含盐量对力学性能也有显著影响，界面动态特性随着含盐量的变化而发生显著变化。此外，在冻融作用后，土壤变得松散，完整性降低，表面不均匀，内部孔隙度增加导致表面滑动。本研究的趋势分析为盐渍土-土工织物界面破坏机制的研究提供了新的思路。

{"title":"Shear behavior of saline soil-geotextile interfaces under freeze-thaw cycles","authors":"Junli Gao, Lai Pan, Feiyu Liu, Yan Yang","doi":"10.1016/j.geotexmem.2025.03.001","DOIUrl":"10.1016/j.geotexmem.2025.03.001","url":null,"abstract":"<div><div>Volume changes in soil caused by freeze-thaw cycles can affect the shear performance of the saline soil-geotextile interface. To investigate this issue, the study examined changes in shear strength, deformation characteristics, and failure modes of the saline soil-geotextile interface under different numbers of freeze-thaw cycles. The experimental results indicate that with the increase in freeze-thaw cycles, the shear stiffness of the interface initially increases and then decreases, demonstrating the reduction in elasticity and resistance to deformation caused by freeze-thaw cycles. And the enhancement of normal stress can effectively increase the density of the soil and the adhesion at the interface, thereby improving shear stiffness. Meanwhile, the salt content in the soil also significantly impacts the mechanical properties, with notable changes in the dynamic characteristics of the interface as the salt content varies. Furthermore, after freeze-thaw actions, the soil becomes loose, reduces in integrity, features uneven surfaces, and sees increased internal porosity leading to slip surfaces. Trend analysis from this study provides new insights into the failure mechanisms at the saline soil-geotextile interface.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 4","pages":"Pages 867-881"},"PeriodicalIF":4.7,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579882","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}

引用次数: 0

Influence of rainfall and drying periods on the performance of a large-scale segmental GRS wall model built with poorly draining local soil 降雨和干燥期对局部排水差的大尺度分段式GRS墙体模型性能的影响

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-03-09 DOI: 10.1016/j.geotexmem.2025.02.003

M.C. Santos , Yoo C , F.H.M. Portelinha

The use of poorly draining local soils as backfill material in geosynthetic reinforced soil walls has become a common practice despite the known risks. With climate change effects, it is crucial to understand how these structures will perform under such extreme conditions. In this study, the performance of a large-scale model of a modular block geogrid-reinforced soil wall, using fine-grained backfill material, is evaluated under varying simulated rainfall intensities and drying periods. The model was constructed in a laboratory environment, enabling the implementation of an extensive instrumentation program designed to monitor soil suction, volumetric water content, and the resulting deformation and reinforcement strains. Tensile loads mobilized by the geogrid within the backfill soil and at the connection with block wall facing are discussed in the paper. The study demonstrates the satisfactory performance of a poorly draining reinforced soil wall even after prolonged and intense simulated rainfall. The low hydraulic conductivity of the well-compacted backfill soil, combined with significant surface runoff, helped maintain low levels of soil suction which reflects in apparent cohesion. Drying periods led to varying but significant rates of suction recovery influenced by rainfall-drying patterns. The findings indicate that rainfall intensities of 10 mm/h (240 mm/day) for over 7 days were insufficient to fully eliminate suction in a poorly draining geogrid-reinforced wall.

使用排水差的当地土壤作为土工合成加筋土墙的回填材料已经成为一种常见的做法，尽管已知的风险。由于气候变化的影响，了解这些结构在这种极端条件下的表现是至关重要的。在这项研究中，采用细粒回填材料的模块化块格土工格栅加筋土墙的大尺度模型在不同的模拟降雨强度和干燥时间下的性能进行了评估。该模型是在实验室环境中构建的，可以实施广泛的仪器程序，用于监测土壤吸力、体积含水量以及由此产生的变形和加固应变。本文讨论了土工格栅在回填土内及与砌块墙接头处所调动的拉伸荷载。研究表明，在长时间的强模拟降雨作用下，疏水性较差的加筋土墙仍具有良好的性能。压实良好的回填土的低水力导率，加上大量的地表径流，有助于保持较低的土壤吸力水平，这反映在表观粘聚性上。干燥期导致受降雨干燥模式影响的吸力恢复速率变化但显著。研究结果表明，持续7天以上的10毫米/小时（240毫米/天）降雨强度不足以完全消除排水差的土工格栅加筋墙的吸力。

{"title":"Influence of rainfall and drying periods on the performance of a large-scale segmental GRS wall model built with poorly draining local soil","authors":"M.C. Santos , Yoo C , F.H.M. Portelinha","doi":"10.1016/j.geotexmem.2025.02.003","DOIUrl":"10.1016/j.geotexmem.2025.02.003","url":null,"abstract":"<div><div>The use of poorly draining local soils as backfill material in geosynthetic reinforced soil walls has become a common practice despite the known risks. With climate change effects, it is crucial to understand how these structures will perform under such extreme conditions. In this study, the performance of a large-scale model of a modular block geogrid-reinforced soil wall, using fine-grained backfill material, is evaluated under varying simulated rainfall intensities and drying periods. The model was constructed in a laboratory environment, enabling the implementation of an extensive instrumentation program designed to monitor soil suction, volumetric water content, and the resulting deformation and reinforcement strains. Tensile loads mobilized by the geogrid within the backfill soil and at the connection with block wall facing are discussed in the paper. The study demonstrates the satisfactory performance of a poorly draining reinforced soil wall even after prolonged and intense simulated rainfall. The low hydraulic conductivity of the well-compacted backfill soil, combined with significant surface runoff, helped maintain low levels of soil suction which reflects in apparent cohesion. Drying periods led to varying but significant rates of suction recovery influenced by rainfall-drying patterns. The findings indicate that rainfall intensities of 10 mm/h (240 mm/day) for over 7 days were insufficient to fully eliminate suction in a poorly draining geogrid-reinforced wall.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 4","pages":"Pages 847-866"},"PeriodicalIF":4.7,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579881","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}

引用次数: 0

Use of soilbags to protect flexible pipes against repeated load effects 使用沙袋保护柔性管道免受重复载荷影响

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-02-27 DOI: 10.1016/j.geotexmem.2025.02.004

S.N. Moghaddas Tafreshi , A.F. Ahmadian , A.R. Dawson

An investigation was made of the over-trench bridging effect provided by soilbags to reduce the pressure on, and vertical and horizontal diametral change (VDC and HDC) of, buried flexible pipes, along with reductions in trench surface settlement (TSS). Full-scale tests examined the effects of burial depth, soilbag width, number of soilbag layers and distance between layers in trenches with 250-mm diameter pipes subjected to 150 surface loading cycles that simulated vehicular traffic. TSS reduced most when a soilbag was nearest the surface, while positioning a soilbag over the pipe's crown best protected the pipe. The soilbag's width must exceed 1.2 times the loading surface diameter/width to prevent unhelpful downward (punching) movement of soilbags into the trench backfill. Increasing soilbag width beyond 1.6–2 times that diameter/width or using more than two (sometimes three) soilbag layers, delivers diminishing returns. Using one to four soilbag layers, TSS, VDC and pipe pressure reduce to 45-15%, 70-15% and 75-25% of the unreinforced values, respectively, though the improvement rates diminish with increasing layers. Overall, TSS and pipe protection are similarly sensitive to the positioning of two layers of soilbags, while the spacing between the layers has the opposite effect.

研究了土袋对降低埋地柔性管道的压力、垂直和水平直径变化（VDC和HDC）以及减少沟槽表面沉降（TSS）的桥接作用。全尺寸试验考察了埋深、土袋宽度、土袋层数和层间距离对管道直径为250毫米的沟槽的影响，这些沟槽在模拟车辆交通的150次表面加载循环中受到影响。当土袋靠近管道表面时，TSS降低最多，而将土袋放置在管道顶部可以最好地保护管道。土袋的宽度必须超过荷载面直径/宽度的1.2倍，以防止土袋向下（冲）进入沟填土。将土袋宽度增加到直径/宽度的1.6-2倍以上，或使用超过两层（有时是三层）的土袋层，收益递减。使用1 ~ 4层土袋，TSS、VDC和管道压力分别降低到未加筋值的45 ~ 15%、70 ~ 15%和75 ~ 25%，但改善率随着层数的增加而降低。总体而言，TSS和管道保护对两层土袋的定位同样敏感，而层与层之间的间距则相反。

{"title":"Use of soilbags to protect flexible pipes against repeated load effects","authors":"S.N. Moghaddas Tafreshi , A.F. Ahmadian , A.R. Dawson","doi":"10.1016/j.geotexmem.2025.02.004","DOIUrl":"10.1016/j.geotexmem.2025.02.004","url":null,"abstract":"<div><div>An investigation was made of the over-trench bridging effect provided by soilbags to reduce the pressure on, and vertical and horizontal diametral change (<em>VDC</em> and <em>HDC</em>) of, buried flexible pipes, along with reductions in trench surface settlement (<em>TSS</em>). Full-scale tests examined the effects of burial depth, soilbag width, number of soilbag layers and distance between layers in trenches with 250-mm diameter pipes subjected to 150 surface loading cycles that simulated vehicular traffic. <em>TSS</em> reduced most when a soilbag was nearest the surface, while positioning a soilbag over the pipe's crown best protected the pipe. The soilbag's width must exceed 1.2 times the loading surface diameter/width to prevent unhelpful downward (punching) movement of soilbags into the trench backfill. Increasing soilbag width beyond 1.6–2 times that diameter/width or using more than two (sometimes three) soilbag layers, delivers diminishing returns. Using one to four soilbag layers, <em>TSS</em>, <em>VDC</em> and pipe pressure reduce to 45-15%, 70-15% and 75-25% of the unreinforced values, respectively, though the improvement rates diminish with increasing layers. Overall, TSS and pipe protection are similarly sensitive to the positioning of two layers of soilbags, while the spacing between the layers has the opposite effect.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 4","pages":"Pages 823-846"},"PeriodicalIF":4.7,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510345","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}

引用次数: 0

Deformation and load transfer of pile-supported foundation reinforced with soilbags raft cushion 土袋筏垫层加固桩承基础的变形与荷载传递

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-02-18 DOI: 10.1016/j.geotexmem.2025.01.005

Bowen Li, Sihong Liu, Xuelei Han, Yang Lu, Yuansheng Liu

This study proposes a new pile-supported soilbags raft cushion for foundation treatment. A series of two-dimensional model tests were conducted on the reinforced foundation to investigate its deformation and load transfer characteristics. An analytical method was established to determine the surface pressure between the piles. The tests demonstrated that the soilbags raft cushion can reduce the differential settlement of the foundation by improving the uniformity of the load transfer. The deformation patterns and load transfer efficiency of the soilbags raft cushion reinforced foundation were found to be related to the pile spacing, the embedded depth of the pile top, the thickness of the soilbags raft cushion, and the external pressure applied to the foundation surface. The performance of soilbags raft cushion is more effective when the ratio of the embedded depth of the pile top to the pile spacing is at least one and the ratio of the thickness of the cushion to the embedded depth of the pile top is at least 0.2. The analytical method considers the relative pile-soil settlement and the elastic modulus of the soilbags raft cushion reinforced foundation, allowing for a reasonable evaluation of the surface pressure between the piles and the load transfer efficiency.

本研究提出一种新型桩承式土袋筏垫地基处理方法。对加固地基进行了一系列二维模型试验，研究了加固地基的变形和荷载传递特性。建立了一种确定桩间表面压力的解析方法。试验结果表明，土袋筏垫层可以通过改善荷载传递的均匀性来减少地基的差沉降。发现土袋筏垫加固基础的变形模式和荷载传递效率与桩间距、桩顶埋深、土袋筏垫厚度、地基表面外压力有关。当桩顶嵌入深度与桩距之比至少为1，垫层厚度与桩顶嵌入深度之比至少为0.2时，土袋筏垫层的性能更为有效。该分析方法考虑了桩土相对沉降和土袋筏垫加固基础的弹性模量，合理地评价了桩间表面压力和荷载传递效率。

{"title":"Deformation and load transfer of pile-supported foundation reinforced with soilbags raft cushion","authors":"Bowen Li, Sihong Liu, Xuelei Han, Yang Lu, Yuansheng Liu","doi":"10.1016/j.geotexmem.2025.01.005","DOIUrl":"10.1016/j.geotexmem.2025.01.005","url":null,"abstract":"<div><div>This study proposes a new pile-supported soilbags raft cushion for foundation treatment. A series of two-dimensional model tests were conducted on the reinforced foundation to investigate its deformation and load transfer characteristics. An analytical method was established to determine the surface pressure between the piles. The tests demonstrated that the soilbags raft cushion can reduce the differential settlement of the foundation by improving the uniformity of the load transfer. The deformation patterns and load transfer efficiency of the soilbags raft cushion reinforced foundation were found to be related to the pile spacing, the embedded depth of the pile top, the thickness of the soilbags raft cushion, and the external pressure applied to the foundation surface. The performance of soilbags raft cushion is more effective when the ratio of the embedded depth of the pile top to the pile spacing is at least one and the ratio of the thickness of the cushion to the embedded depth of the pile top is at least 0.2. The analytical method considers the relative pile-soil settlement and the elastic modulus of the soilbags raft cushion reinforced foundation, allowing for a reasonable evaluation of the surface pressure between the piles and the load transfer efficiency.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 3","pages":"Pages 811-821"},"PeriodicalIF":4.7,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427934","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}

引用次数: 0

Evaluation of two-layered soils reinforced with 3D printed geogrid models under axisymmetric loading conditions 轴对称荷载条件下3D打印土工格栅模型加筋双层土的评价

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-02-16 DOI: 10.1016/j.geotexmem.2025.01.008

Gabriel M. Oliveira, Isabel M.C.F.G. Falorca

A series of drained triaxial tests was carried out on homogeneous and two-layered soil (TLS) samples under low confining pressure. A granite aggregate was selected as the base layer, and sand was used to simulate the subgrade. Geogrids with varying aperture sizes and stiffness values were designed using CAD software and manufactured using 3D printing technology. A method for correcting the cross-sectional area during triaxial TLS testing was developed. The load transfer at the aggregate-geogrid interface was also evaluated. The strength of the TLS samples increased as the relation between the aperture size of the geogrid and the median particle diameter was closer to unity. Consistent results were found for the polylactic acid (PLA), photopolymer (RGD 8560), and polypropylene (PP) geogrids, but better mechanical behavior was observed for the RGD 8560 geogrid. Higher tensile forces at the interface were mobilized in geogrids with greater stiffness. However, the best interface behavior is not solely governed by the geogrid stiffness.

在低围压条件下，对均匀土和双层土进行了一系列排水三轴试验。选择花岗岩骨料作为基层，用砂土模拟路基。采用CAD软件设计不同孔径大小和刚度值的土工格栅，并采用3D打印技术制造。提出了一种校正三轴TLS测试中截面积的方法。并对土工格栅界面处的荷载传递进行了分析。随着土工格栅孔径大小与中位粒径之间的关系趋于一致，TLS样品的强度增加。聚乳酸（PLA）、光聚合物（RGD 8560）和聚丙烯（PP）土工格栅的力学性能一致，但RGD 8560土工格栅的力学性能更好。在刚度较大的土工格栅中，界面处的拉力也较大。然而，最佳的界面行为并不完全由土工格栅刚度决定。

引用次数: 0

Numerical investigation of ground reinforced embankments: Structural geometry design 地基加筋土堤防的数值研究：结构几何设计

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-02-14 DOI: 10.1016/j.geotexmem.2025.01.006

Liang Xiao , Qingshan Meng , Shizhan Lv , Ting Yao , Yaxiong Liao

Ground reinforced embankment (GRE) is a common and efficient rockfall mitigation measure. However, due to the diversity of geometric dimensions and composite components of the embankments worldwide, the design methods have not yet been unified. This article proposes a DEM-based framework for modeling the GREs impacted by rockfalls, and to optimize the structural design by comparing the block-intercepting performance. The numerical model based on MatDEM is validated by restoring the Peila's field tests, and the simulated materials are calibrated by comparing the laboratory test results. The design elements can be determined through simulated impact tests, with the site topography and rockfall trajectory as prerequisite information. The simulation test results show that the structural positions and cross-sectional shapes alter the interaction between rockfalls and embankments, thereby affecting the block-intercepting capacity. Under the impact of high-energy blocks, the characteristic of structural failure is that the extrusion of the downhill face is greater than the displacement of the uphill face, which can be used as a criteria to determine the reasonable design elements. The proposed framework can be applied to an actual site and maximize the cost-benefit performance of design depending on the site space and budget conditions.

地基加筋路堤是一种常见而有效的岩崩防治措施。然而，由于世界范围内堤防的几何尺寸和复合构件的多样性，设计方法尚未统一。本文提出了一种基于dem的框架来模拟受落石冲击的GREs，并通过比较截块性能来优化结构设计。通过恢复Peila的现场试验验证了基于MatDEM的数值模型，并通过对比实验室试验结果对模拟材料进行了校准。设计要素可以通过模拟冲击试验确定，以场地地形和落石轨迹为前提信息。模拟试验结果表明，构筑物的位置和断面形状改变了落石与路堤之间的相互作用，从而影响了拦阻能力。在高能块体冲击下，结构破坏的特点是下坡面的挤压大于上坡面的位移，可以此作为确定合理设计要素的标准。建议的框架可以应用于实际场地，并根据场地空间和预算条件最大化设计的成本效益表现。

{"title":"Numerical investigation of ground reinforced embankments: Structural geometry design","authors":"Liang Xiao , Qingshan Meng , Shizhan Lv , Ting Yao , Yaxiong Liao","doi":"10.1016/j.geotexmem.2025.01.006","DOIUrl":"10.1016/j.geotexmem.2025.01.006","url":null,"abstract":"<div><div>Ground reinforced embankment (GRE) is a common and efficient rockfall mitigation measure. However, due to the diversity of geometric dimensions and composite components of the embankments worldwide, the design methods have not yet been unified. This article proposes a DEM-based framework for modeling the GREs impacted by rockfalls, and to optimize the structural design by comparing the block-intercepting performance. The numerical model based on MatDEM is validated by restoring the Peila's field tests, and the simulated materials are calibrated by comparing the laboratory test results. The design elements can be determined through simulated impact tests, with the site topography and rockfall trajectory as prerequisite information. The simulation test results show that the structural positions and cross-sectional shapes alter the interaction between rockfalls and embankments, thereby affecting the block-intercepting capacity. Under the impact of high-energy blocks, the characteristic of structural failure is that the extrusion of the downhill face is greater than the displacement of the uphill face, which can be used as a criteria to determine the reasonable design elements. The proposed framework can be applied to an actual site and maximize the cost-benefit performance of design depending on the site space and budget conditions.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 3","pages":"Pages 780-797"},"PeriodicalIF":4.7,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420495","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}

引用次数: 0