Geotextiles and Geomembranes最新文献_第10页

Generation and prediction of defect in HDPE GMB serving as landfill base barrier 填埋场基障HDPE GMB缺陷的产生与预测

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-02-09 DOI: 10.1016/j.geotexmem.2025.01.009

Feng Yang , Jingcai Liu , Ting Lin , Changxin Nai , Yuqiang Liu , Panpan Qiu , Ya Xu , Can Qian

This study utilized electrical defects detection, correlation analysis, and regression analysis to conduct a prediction about the generation of defects in high-density polyethylene geomembranes (HDPE GMBs) in landfills. The findings revealed that the average defect density of 108 landfills was 15 defects/ha, and the average defect area was 122 cm²/ha. Four out of the 11 potential indicators, namely construction unit qualification, HDPE GMB thickness, drainage media type, and drainage system structure, had a significant impact on the density of installation and total defects. Prediction models of installation and total defects, using the four key indicators as independent variables, could reasonably predict the occurrence of initial defects. The model supports the accurate prediction of landfill risk and the identification of high-risk sites, which is crucial for hierarchical classification management and risk control.

本研究利用电缺陷检测、相关分析、回归分析等方法对垃圾填埋场高密度聚乙烯土工膜（HDPE GMBs）缺陷的产生进行预测。结果显示，108个堆填区的平均缺陷密度为15个/ha，平均缺陷面积为122 cm2/ha。在11项潜在指标中，施工单位资质、HDPE GMB厚度、排水介质类型和排水系统结构4项对安装密度和总缺陷有显著影响。安装缺陷和总缺陷预测模型以这四个关键指标为自变量，可以合理地预测初始缺陷的发生。该模型支持垃圾填埋场风险的准确预测和高风险场地的识别，对分级分类管理和风险控制具有重要意义。

引用次数: 0

Investigation of geogrid-reinforced unbound granular material behavior using constant radial stiffness triaxial tests 用恒定径向刚度三轴试验研究土工格栅加筋松散颗粒材料的性能

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-02-08 DOI: 10.1016/j.geotexmem.2025.01.007

Ziheng Wang, Yue Chen, Yuekai Xie, Jianfeng Xue

A series of constant radial stiffness triaxial (CRST) tests were performed to investigate the long-term behavior of geogrid-reinforced unbound granular materials (UGMs). Two types of multi-stage cyclic loading tests were conducted with various vertical constant loads (

σ_{1, \min}

). In the first type,

σ_{1, \min}

was maintained at 10% of the maximum axial stress at each loading stage to determine the resilient modulus. The results indicated that the inclusion of geogrid increased the resilient modulus by 21–25 MPa under various cyclic loads. In the second type of tests, three tests were performed with

σ_{1, \min}

of 5, 10, and 20 kPa, respectively, to investigate the effects of vertical constant loads on the contributions of geogrids to the confining stress and permanent deformation. The results showed that the inclusion of geogrid mitigated permanent deformation by enhancing the confining stress. However, an adverse effect of the geogrid on permanent deformation was observed when

σ_{1, \min}

was 5 kPa, which can be attributed to the loss of contact between the geogrid and aggregates. Furthermore, R-values and stress paths obtained in this study also demonstrated the capability of CRST tests in quantifying the effects of geogrids on UGMs under cyclic loadings.

为了研究土工格栅增强无粘结颗粒材料（UGMs）的长期性能，进行了一系列恒定径向刚度三轴（CRST）试验。进行了两种不同竖向恒载荷（σ1,min）的多级循环加载试验。在第一种类型中，σ1，min在每个加载阶段保持在最大轴向应力的10%，以确定弹性模量。结果表明：在不同循环荷载下，土工格栅的加入可使其弹性模量提高21 ~ 25 MPa。在第2类试验中，采用σ1、σ 5、σ 10和σ 20 kPa分别进行3次试验，研究竖向恒定荷载对土工格栅围应力和永久变形贡献的影响。结果表明，土工格栅的加入通过提高围应力来缓解永久变形。然而，当σ1，min为5 kPa时，土工格栅对永久变形有不利的影响，这可能是由于土工格栅与骨料之间失去了接触。此外，本研究获得的r值和应力路径也证明了CRST试验在量化循环荷载下土工格栅对ugm的影响方面的能力。

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引用次数: 0

Mitigating frost heave of an expansive soil channel reinforced with soilbags: Insights from physical model tests 缓解用土袋加固的膨胀土通道的霜胀：来自物理模型试验的见解

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-02-01 DOI: 10.1016/j.geotexmem.2025.01.004

Yonggan Zhang , Yang Lu , Sihong Liu , Jin Liu , Yulong Liu , Jinbo Tian

Frost heave significantly affects the normal operation and long-term performance of expansive soil channels, and the soilbag reinforcement method offers a potential solution for its mitigation and control. To confirm the effectiveness of the soilbag reinforcement method in frost heave mitigation of expansive soil channels, a middle-scale model test apparatus was developed to be equipped with temperature control and water supply functions, and then two groups of physical model tests were conducted. The evolution of water and heat distribution, frost heave deformation, and surface morphology in expansive soil channels with and without soilbag reinforcement during the freezing process were carefully compared. The experimental results demonstrate that: 1) The developed apparatus presents excellent performance, which can accurately capture the freezing behavior differences between an expansive soil channel and a soilbag-reinforced channel. 2) Utilizing soilbags in expansive soil channels not only provides thermal insulation but also mitigates the segregation frost heave. 3) Soilbags have the ability to decrease water evaporation from the bagged expansive soil, effectively preventing the soil from shrinking due to water loss while also reducing uneven deformation. Furthermore, the frost heave mitigation mechanism of the soilbag-reinforced expansive soil channel was well illustrated with two idealized schematic diagrams.

冻胀严重影响膨胀土通道的正常运行和长期性能，土袋加固方法为其缓解和控制提供了潜在的解决方案。为验证土袋加固法在膨胀土渠道冻胀治理中的有效性，研制了具有温控和供水功能的中尺度模型试验装置，并进行了两组物理模型试验。比较了加土袋加固和不加土袋加固膨胀土通道冻结过程中水热分布、冻胀变形和地表形态的演变。实验结果表明：1)所研制的装置性能优良，能较准确地捕捉膨胀土沟道与土袋加固沟道的冻结特性差异；2)在膨胀土通道中利用土袋不仅可以起到保温的作用，还可以缓解离析冻胀。3)袋装土具有减少袋装膨胀土水分蒸发的能力，有效防止土壤因失水而收缩，同时减少不均匀变形。此外，用两张理想化的示意图很好地说明了土袋加固膨胀土通道的冻胀机理。

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引用次数: 0

Estimation of the carbon sequestration potential of ecological retaining structures: A comparative study 生态围护结构固碳潜力估算：比较研究

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-01-27 DOI: 10.1016/j.geotexmem.2025.01.003

Yuming Zhu , Fei Zhang , Junjun Ni , Shilin Jia

In the pursuit of sustainable development, the environmental impacts of geotechnical engineering are often neglected. The utilization of geosynthetic-reinforced soil (GRS) and ecological slope protection technology presents promising and eco-friendly alternatives, paving the way for a cleaner future. In this study, the temporal and spatial distribution of the carbon coefficient (CC) and embodied energy coefficient (EEC) are characterized through data analysis. Subsequently, the impact of spatial factors on the total embodied carbon (TEC) is considered. Finally, the carbon sequestration effect of vegetation through photosynthesis is quantified to examine the long-term environmental impact of the selected design options. The findings suggest that embodied carbon (EC) is preferable as an indicator for environmental impact assessment. The GRS technology can effectively mitigate approximately one-third of the environmental impacts compared to conventional methods. Furthermore, when combined with vegetation, GRS technology can achieve net-zero emissions approximately 30 years after the construction of the ecological retaining structure. Although many factors are not considered in this study, the results may inform initial decisions to realize more sustainable infrastructure.

在追求可持续发展的过程中，岩土工程的环境影响往往被忽视。利用土工合成加筋土（GRS）和生态护坡技术提供了有前途和环保的替代方案，为更清洁的未来铺平了道路。本研究通过数据分析，对碳系数（CC）和蕴含能系数（EEC）的时空分布特征进行了表征。在此基础上，分析了空间因子对总隐含碳（TEC）的影响。最后，对植被通过光合作用的固碳效应进行量化，以检验所选设计方案的长期环境影响。研究结果表明，隐含碳（EC）更适合作为环境影响评价的指标。与传统方法相比，GRS技术可以有效减轻大约三分之一的环境影响。此外，当与植被相结合时，GRS技术可以在生态围护结构建设后约30年内实现净零排放。虽然本研究没有考虑到许多因素，但结果可能为实现更可持续的基础设施的初步决策提供信息。

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引用次数: 0

Experimental study on the vacuum consolidation of recycled fibre-improved soft soils assisted with prefabricated vertical drain 预制竖向排水辅助下再生纤维改良软土真空固结试验研究

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-01-20 DOI: 10.1016/j.geotexmem.2025.01.002

Kai Lou , Zhen-Yu Yin , Ding-Bao Song , Wei-Feng Huang

Billions of face masks were discarded daily, causing severe environmental concerns. Recycling waste face masks presents a significant challenge. Meanwhile, the traditional vacuum preloading shows limitations on the performance on soft soil ground. This paper investigates the potential benefits of reusing Face-Mask Fibres (FMF) as an admixture to enhance the treatment effects of vacuum preloading on soft soils. The performance of an environmentally biodegradable type of Prefabricated Vertical Drain (PVD) is also compared with that of conventional PVD through a series of laboratory physical model tests. The settlement, distributions of vacuum pressure, porewater pressure, and water content were monitored. In addition, after vacuum preloading, the undrained shear strength of treated soil was determined. Scanning electron microscope tests were also carried out to analyse the microscopic structure of treated soil. Results reveal that face-mask fibres significantly improved the performances of vacuum preloading in terms of vacuum dewatering and strengthening. Furthermore, the rate of vacuum consolidation was accelerated due to the additional drainage channels provided by recycled face-mask fibres. Notably, the final water content of the treated soil decreased to 41.8%, which is markedly lower than the liquid limit of 63.9%. The undrained shear strength exhibited considerable improvement, nearly doubling in value. The mechanism of how FMF works was also discussed.

每天有数十亿个口罩被丢弃，造成了严重的环境问题。回收废弃口罩是一项重大挑战。同时，传统的真空预压在软土地基上表现出一定的局限性。研究了面罩纤维（FMF）作为增强真空预压处理软土效果的复合材料的潜在效益。通过一系列的实验室物理模型试验，比较了环境可生物降解型预制垂直排水管（PVD）与常规预制垂直排水管的性能。监测了沉降、真空压力、孔隙水压力和含水率的分布。此外，对真空预压后处理土的不排水抗剪强度进行了测定。利用扫描电镜对处理后土壤的微观结构进行了分析。结果表明，面罩纤维在真空脱水和强化方面显著改善了真空预压的性能。此外，由于回收的面罩纤维提供了额外的排水通道，真空固结的速度加快了。处理后土壤的最终含水量降至41.8%，明显低于液限63.9%。不排水抗剪强度有明显提高，几乎增加了一倍。讨论了FMF的作用机理。

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引用次数: 0

Influence of perforation characteristics and geotextile envelopes on the drain pipe 射孔特性及土工布围护结构对排水管的影响

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-01-09 DOI: 10.1016/j.geotexmem.2024.12.008

Yingao Zhang , Shaoli Wang , Ruixia Hao

Preventing clogging effectively and ensuring stable drainage performance are crucial for the efficacy of subsurface drainage systems. This paper presents the results of a laboratory study on the drainage performance of drain pipes using soil samples from the Yinbei Irrigation District in Ningxia Hui Autonomous Region, China. The perforation characteristics and geotextile envelopes were investigated. Results demonstrated that a drain pipe with a six-row staggered perforation layout performed exceptionally well in drainage. Increasing the number and reducing the size of perforations while maintaining a constant perforation ratio can enhance drainage performance. A higher degree of clogging was observed in the geotextile envelope at the bottom of the drain pipe, and this issue can be mitigated by increasing the perforation ratio of the pipe wall. Findings from this study can provide theoretical support and practical guidance for optimizing the design of drain pipe perforations and the selection of geotextile envelopes in subsurface drainage.

有效防止堵塞并确保稳定的排水性能对地下排水系统的功效至关重要。本文利用中国宁夏回族自治区银北灌区的土壤样本，对排水管的排水性能进行了实验室研究。研究了穿孔特征和土工织物包层。结果表明，采用六排交错穿孔布局的排水管排水效果特别好。在保持穿孔率不变的情况下，增加穿孔数量和减小穿孔尺寸可提高排水性能。在排水管底部的土工织物围护结构中观察到较高程度的堵塞，这个问题可以通过增加管壁的穿孔率来缓解。本研究的结果可为优化地下排水中排水管穿孔设计和土工织物包层的选择提供理论支持和实践指导。

引用次数: 0

An approximate solution of consolidation for double-layered ground with different smear radii by vertical drains 不同涂抹半径双层地基垂直排水固结的近似解

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-01-07 DOI: 10.1016/j.geotexmem.2025.01.001

Desheng Li , Yonghui Chen , Long Chen , Kaizhe Shang , Junquan Dong

An analytical solution for consolidation of double-layered ground by vertical drains is proposed, in which only the radial seepage is taken into consideration and the smear radius varies with soil layers. To improve the computing efficiency, a simplified method for selecting serious solutions is presented. The approximate solution is illustrated by Tang's solution (Tang and Onitsuka, 2001) and a large radial consolidation test. The error caused by the forbiddance of vertical drainage can be ignored when the ratio of vertical time factor to radial time factor is small enough, for example, 1/200; and which is easy to satisfy in the field. Through adjusting the control precision of series solutions, the consolidation behavior at any soil layer can be calculated. Horizontal permeability coefficient and smear radius affect the consolidation rate, especially when changing them in the layer which has smaller consolidation coefficient. Moreover, the orthogonal relation for the double-layered and muti-layered system is demonstrated. Using the proposed method, analytical solution for consolidation of double-layered ground by vertical drains can be more acceptable to engineers.

提出了一种仅考虑径向渗流、涂抹半径随土层变化的竖向排水固结双层地基的解析解。为了提高计算效率，提出了一种选择严肃解的简化方法。近似解由Tang的解（Tang and Onitsuka, 2001）和大型径向固结试验说明。当竖向时间因子与径向时间因子之比足够小，如1/200时，可忽略竖向排水禁止所引起的误差；这在现场很容易满足。通过调整级数解的控制精度，可以计算任意土层的固结特性。水平渗透系数和涂抹半径会影响固结速率，尤其是在固结系数较小的土层中。此外，还证明了双层和多层系统的正交关系。采用该方法，竖向排水固结双层地基的解析解更能被工程人员所接受。

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引用次数: 0

Long-term performance of polyethylene geomembranes to contain brine 聚乙烯土工膜长期耐卤水性能

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-01-02 DOI: 10.1016/j.geotexmem.2024.12.006

M. Zafari , R. Kerry Rowe , R. Awad

The degradation of five fortified polyethylene geomembranes (three HDPE, one LLDPE, and one blended) with high initial properties compared to minimum requirements in GRI-GM13 is investigated when immersed in brine at three concentrations (100%, 50%, and 10% brine) and deionized water at temperatures ranging from 25 to 95°C for 8 years. The performance of the geomembranes in different incubation fluids is compared to explore the effect of salt concentration on the durability of geomembranes. The results indicate that the high initial properties of a GMB may not be indicative of its long-term performance due to the effect of other factors like GMB resin, stabilizers, thickness, exposure conditions, and manufacturing process on GMB degradation. Increasing salt concentration decreases the rate of antioxidant depletion, with a depletion rate in 10% brine 1.5 times faster than that in 100% brine. Thus, any assessment of the likely service life of a polyethylene geomembrane in a brine pond with variable salt concentration requires investigating their performance over the expected range of brine concentrations. Temperature and choice of geomembrane (especially antioxidant package) are shown to have a significant (e.g., by a factor of 4 at 55°C in brine) effect on liner longevity.

研究了五种初始性能高于GRI-GM13最低要求的强化聚乙烯土工膜（三种HDPE、一种LLDPE和一种混合）在三种浓度的盐水（100%、50%和10%的盐水）和去离子水中浸泡8年，温度从25°C到95°C，对其降解进行了研究。通过对不同培养液中土工膜性能的比较，探讨盐浓度对土工膜耐久性的影响。结果表明，由于GMB树脂、稳定剂、厚度、暴露条件和制造工艺等因素对GMB降解的影响，GMB的高初始性能可能不能代表其长期性能。随着盐浓度的增加，抗氧化剂的损耗速率降低，在10%盐水中，抗氧化剂的损耗速率比在100%盐水中快1.5倍。因此，要评估聚乙烯土工膜在不同盐浓度的盐水池中可能的使用寿命，就需要研究其在预期盐水浓度范围内的性能。温度和土工膜（特别是抗氧化膜）的选择对衬管寿命有显著影响（例如，在55°C的盐水中有4倍影响）。

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引用次数: 0

Field behavior of a GRS bridge approach retaining wall on highly compressible foundation soils 高压缩性地基土上GRS桥接近挡土墙的场特性

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2024-12-31 DOI: 10.1016/j.geotexmem.2024.12.007

Chunhai Wang , Huabei Liu , Mengyuan Luo , Kui Gao , Juntao Zhu , Kaifeng Zeng

To reveal the behavior of geosynthetic-reinforced soil (GRS) bridge approach retaining walls on highly compressible foundation soils, in this study, a GRS bridge approach adjacent to the Yangtze River was monitored for approximately 3 years during construction and post-construction. The settlement of the GRS bridge approach, the vertical earth pressure at the base of the backfill soil, and the reinforcement deformation were monitored. The monitoring points were arranged on the left and right sides of a cross-section and a longitudinal section at the mid-span. The results showed that the settlement of the GRS bridge approach was large and uneven, and the settlement rates were influenced by the water level of the Yangtze River. Due to the large and differential settlement, the distributions of the vertical earth pressure and geogrid reinforcement strain for a retaining wall constructed on highly compressible foundation soils were different from those for a retaining wall constructed on stable foundation soils. The overall GRS bridge approach performed well with large settlements, with only some minor structural problems in the facing of the retaining wall. This indicated that the flexible GRS bridge approach was a good choice when the retaining wall was constructed on highly compressible foundation soils.

为了揭示高压缩性地基土上GRS桥道挡土墙的性能，本研究对长江附近的GRS桥道进行了近3年的施工期间和施工后监测。监测了GRS桥进路沉降、回填土底部竖向土压力及加固变形。监测点设置在横断面的左右两侧和跨中纵断面上。结果表明：GRS桥道沉降量大且不均匀，沉降速率受长江水位的影响；高压缩性地基上挡土墙的竖向土压力和土工格栅加固应变分布与稳定地基上挡土墙的竖向土压力和土工格栅加固应变分布存在较大差异。整体GRS桥梁方法在大沉降下表现良好，只有挡土墙的面存在一些小的结构问题。说明在高压缩性地基上修筑挡土墙时，柔性GRS桥是一种较好的选择。

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引用次数: 0

A model for predicting permeability of geotextile envelope for subsurface drainage after combined clogging in arid areas 干旱区复合堵塞后土工布包层地下排水渗透性预测模型

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2024-12-30 DOI: 10.1016/j.geotexmem.2024.12.003

Shuai Qin , Chenyao Guo , Jingwei Wu , Shuai He , Haoyu Yang , Chenzhi Yao , Xinman Jiang , Hang Li

This study develops a coupled model for the combined clogging and permeability coefficient of a geotextile envelope. Based on the characteristics of pore size distribution and its impact on permeability coefficient after clogging, a permeability coefficient model assuming the geotextile is composed of multiple layers of planar mesh is developed. Then, based on the range of pore size after clogging, hypotheses for large-pore clogging area and small-pore permeable area are proposed to simulate the process of decreasing the theoretical maximum pore size of the geotextile and the increasing area of large-pore clogging area. The physical and chemical clogging models are coupled and field sampling was used to confirm the availability of the model. Results indicate that the model effectively simulates the impact of clogging on the permeability coefficient. Additionally, sensitivity analysis and trend simulations show that permeability reduction coefficient (

β_{1}

), area density (

μ_{g 0}

), and saturation index (

S I

) are the main factors affecting combined clogging and permeability, with

β_{1}

and

μ_{g 0}

having significant early impacts, while

S I

has a greater impact in the later stages. When

β_{1}

is equal to 0.3 and

S I

is greater than 1.0, the geotextile envelope for subsurface drainage faces a high risk of combined clogging.

本文建立了土工布围护结构的复合堵塞系数和渗透系数的耦合模型。根据土工布的孔隙分布特点及其堵塞后对渗透系数的影响，建立了假设土工布由多层平面网格构成的渗透系数模型。然后，根据堵塞后的孔径范围，提出大孔堵塞面积和小孔渗透面积假设，模拟土工布理论最大孔径减小和大孔堵塞面积增大的过程。将物理和化学堵塞模型进行了耦合，并用现场采样验证了模型的有效性。结果表明，该模型能较好地模拟堵塞对渗透系数的影响。敏感性分析和趋势模拟结果表明，渗透率降低系数（β1）、面积密度（μg0）和饱和指数（SI）是影响渗透率和堵塞复合的主要因素，其中β1和μg0对早期影响显著，而SI对后期影响较大。当β1 = 0.3， SI大于1.0时，土工布地下排水围护结构面临复合堵塞的高风险。

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引用次数: 0