Geotextiles and Geomembranes最新文献_第3页

Interface shear creep behavior between the nonwoven geotextile and the geomembrane pre/post peak strength 非织造土工布与土工膜峰值强度前后界面剪切蠕变行为

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2024-12-13 DOI: 10.1016/j.geotexmem.2024.12.001

Jianyong Shi , Yuchen Zhang , Gaojie Xu , Wei Dai , Zhanlei Liu

In landfills, shear creep of the liner interface occurs after some shear displacements under the influence of a sustained load from waste. In this paper, an apparatus was developed to conduct shear creep tests on interfaces after different initial shear displacements, and experimental investigations were performed on the shear creep behavior of the geotextile and geomembrane interfaces pre/post peak strength. The results demonstrated that the initial instantaneous displacement and the steady displacement rate at the interface increased with increasing shear stress. The initial instantaneous displacement at the geomembrane‒geotextile interface in the post-peak tests was reduced compared with that in the pre-peak tests, whereas the displacement rate at elevated shear stress levels was greater in the post-peak tests than in the pre-peak tests. The creep behavior of the interface was influenced by both the initial shear displacement and the material interaction. An analysis of the Nishihara model revealed that the shear modulus of the Hooke body at the interface increased with increasing shear stress in the pre-peak test, whereas it decreased in the post-peak test as the shear stress increased. The difference in calculated creep time from the 30-day test results and from 3-day creep test results was approximately 8.9%.

在垃圾填埋场中，衬垫界面在垃圾持续荷载的影响下发生一定剪切位移后会出现剪切蠕变。本文开发了一种仪器，用于对不同初始剪切位移后的界面进行剪切蠕变试验，并对土工织物和土工膜界面在峰值强度前后的剪切蠕变行为进行了实验研究。结果表明，界面的初始瞬时位移和稳定位移率随着剪应力的增加而增加。与峰值前试验相比，峰值后试验中土工膜-土工织物界面的初始瞬时位移减小了，而峰值后试验中在剪应力水平升高时的位移速率则大于峰值前试验。界面的蠕变行为受到初始剪切位移和材料相互作用的影响。对 Nishihara 模型的分析表明，在峰值前试验中，界面处胡克体的剪切模量随着剪应力的增大而增大，而在峰值后试验中，随着剪应力的增大而减小。根据 30 天试验结果和 3 天蠕变试验结果计算出的蠕变时间相差约 8.9%。

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引用次数: 0

Influence of geogrid reinforcement on the cracking characteristics of expansive soils: A laboratory study 土工格栅加固对膨胀土开裂特性的影响：实验室研究

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2024-12-07 DOI: 10.1016/j.geotexmem.2024.11.014

Rui Zhang , Yu Zhou , Yipeng Guo , JianLong Zheng , Yufan Deng , Tian Lan

Expansive soils are susceptible to cracking due to significant moisture fluctuations, which can potentially lead to structural instability. Although geogrid reinforcement is widely used to control soil swelling and shrinkage, its effects on cracking behavior are not fully understood. This study investigates the influence of geogrid reinforcement on the cracking behavior of expansive soils by comparing soil samples reinforced with two layers of geogrid to unreinforced samples under evaporation conditions. Crack development was monitored using high-resolution imaging and fluorescence tracing to measure crack depth and calculate surface crack ratio. Additionally, moisture content distribution and evaporation rates were assessed. The results show that geogrid reinforcement reduced the total crack ratio by 1.34% and decreased average crack depth by 43.5%, leading to a more uniform crack distribution with smaller openings. Both internal and external cracks facilitated moisture exchange between the soil and atmosphere. The frictional and interlocking effects at the soil-geogrid interface effectively inhibited cracking and reduced moisture migration. The uniaxial geogrid also induced anisotropy crack restraint, with environmental exposure and geogrid orientation playing critical roles in crack control. Overall, these findings demonstrate the effectiveness of geogrids in enhancing the stability of expansive soils and limiting atmospheric influence through crack suppression.

膨胀土易开裂，由于显著的湿度波动，这可能会导致结构不稳定。虽然土工格栅加固被广泛用于控制土体的膨胀和收缩，但其对开裂行为的影响尚未完全了解。通过对两层土工格栅加筋土样与未加筋土样在蒸发条件下的开裂行为进行比较，研究了土工格栅加筋对膨胀土开裂行为的影响。利用高分辨率成像和荧光示踪技术监测裂纹发展，测量裂纹深度并计算表面裂纹比。此外，还评估了水分含量分布和蒸发速率。结果表明：土工格栅加固使总裂缝率降低1.34%，平均裂缝深度降低43.5%，裂缝分布更均匀，开孔更小；内部和外部裂缝都促进了土壤和大气之间的水分交换。土-土工格栅界面处的摩擦和互锁效应有效地抑制了裂缝，减少了水分的迁移。单轴土工格栅也能诱导各向异性裂缝抑制，其中环境暴露和土工格栅取向在裂缝控制中起关键作用。总的来说，这些发现证明了土工格栅在提高膨胀土稳定性和通过抑制裂缝限制大气影响方面的有效性。

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引用次数: 0

Field test of geosynthetic-reinforced floating pile-supported embankments on soft soil 软土上土工合成筋浮桩支撑路堤的现场试验

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2024-12-04 DOI: 10.1016/j.geotexmem.2024.11.010

Rui Rui , Shi-kai He , Long-fan Peng , S.J.M. Van Eekelen , Liang-hao Li , Yu-qiu Ye

This study conducted field tests on geosynthetic-reinforced floating pile-supported embankments to evaluate the load transfer mechanism and embankment deformation during embankment construction. Vertical pressures on pile caps and subsoils between piles, geosynthetic strains, settlement of pile caps and subsoils between piles, and settlement of the embankment at different elevations were measured throughout the embankment construction. Test results showed that the maximum settlement of the pile cap was approximately 66% of subsoils between the piles. Due to the large settlement of the floating piles, the soil arching was not significantly mobilized. The geosynthetic reinforcement exhibited a maximum tensile strain of 0.2% at the end of embankment construction, indicating a mobilization of low tensioned membrane effect. The predicted equal settlement heights at adjacent piles center and the diagonal pile center were close with an average value of approximately 1.23 times the pile net spacing. The measured vertical pressures on subsoil between piles were compared with calculated results using available analytical models from the literature. The analytical models underestimated the vertical pressures on the subsoils between piles, while the modified Terzaghi's model showed better agreement with the measured results than other analytical models.

本文对土工合成筋浮桩支撑路堤进行了现场试验，对路堤施工过程中的荷载传递机理和路堤变形进行了评价。在整个路堤施工过程中，测量了承台和桩间底土的竖向压力、土工合成应变、承台和桩间底土的沉降以及不同标高路堤的沉降。试验结果表明，承台最大沉降量约为桩间底土沉降量的66%。由于浮桩沉降较大，土拱没有受到明显的调动。土工合成钢筋在路堤施工结束时的最大拉伸应变为0.2%，表明低张力膜效应的动员。相邻桩心和对角桩心预测的等沉降高度接近，平均值约为桩网距的1.23倍。将实测的桩间底土竖向压力与文献中现有分析模型的计算结果进行了比较。分析模型低估了桩间底土的竖向压力，而改进的Terzaghi模型与实测结果吻合较好。

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引用次数: 0

A novel two-layer composite geomembrane lining structure to mitigate frost damage in cold-region canals: Model test and numerical simulation 减轻寒冷地区运河冻害的新型双层复合土工膜衬里结构：模型试验和数值模拟

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2024-12-04 DOI: 10.1016/j.geotexmem.2024.11.013

Haoyuan Jiang , Mingyi Zhang , Zhengzhong Wang , Yi Wang , Zhengyi Wang , Xinjian Sun

The canal is crucial for water diversion projects, but it is susceptible to frost damage. To address this, a two-layer composite geomembrane lining structure (TLCGLS) was proposed that regulates the interaction between canal lining and frozen soil. Model tests were conducted to investigate its anti-frost heave effectiveness. Considering the interaction among the lining, two-layer composite geomembranes (TLCGs), and frozen soil, a canal frost heave model with heat-water-mechanical coupling was developed. The influence of canal cross-section shapes and TLCGs arrangements on anti-frost heave performance and mechanism of TLCGLS were discussed. Results show that TLCGLS reduces uneven frost heave degree and compressive/tensile strains of the lining by 35%, 29%, and 28% respectively. During melting, it rapidly reduces frost heave, tangential deformation, and strain with minimal residual effects. TLCGLS demonstrates strong resetting ability and excellent anti-frost heave performance. It is particular suitable for arc-bottomed trapezoidal canals. However, excessive reduction in friction between TLCGs weakens arching effect of the bottom lining, increasing tensile stress and safety risks. TLCGLS with geomembrane-geotextile contact exhibits superior anti-frost heave performance, mitigating compressive stress by over 50% while meeting design requirements for tensile stress. These findings provide a theoretical basis and technical solution for mitigating frost damage in canals.

这条运河对引水工程至关重要，但它容易受到霜冻的损害。为了解决这一问题，提出了一种双层复合土工膜衬砌结构（TLCGLS）来调节管道衬砌与冻土的相互作用。通过模型试验研究了其抗冻胀效果。考虑衬砌、双层复合土工膜（TLCGs）与冻土之间的相互作用，建立了考虑热-水-力耦合的运河冻胀模型。讨论了运河断面形状和TLCGs布置对TLCGs抗冻胀性能的影响，并探讨了TLCGs抗冻胀机理。结果表明：TLCGLS可使衬砌的不均匀冻胀程度和压拉应变分别降低35%、29%和28%；在融化过程中，它迅速减少霜胀，切向变形和应变与最小的残余影响。TLCGLS具有较强的复位能力和良好的抗冻胀性能。特别适用于弧形底梯形管。然而，tlcg之间的摩擦过大，会减弱衬底的拱效应，增加拉应力和安全风险。具有土工膜-土工织物接触的TLCGLS具有优异的抗冻胀性能，在满足设计拉应力要求的同时，可减轻50%以上的压应力。研究结果为减轻水渠冻损提供了理论依据和技术解决方案。

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引用次数: 0

The influence of geosynthetic properties on their shear behaviors at the interface with frozen soil 土工合成材料性能对其与冻土界面剪切性能的影响

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2024-12-01 DOI: 10.1016/j.geotexmem.2024.11.011

Pengfei He , Guangliang Hou , Haitao Cao , Feng Yue

This paper investigates the shear properties of the interfaces between sand and short-staple nonwoven geotextile (GT1), long-staple nonwoven geotextile (GT2), and geomembrane (GM) under varying conditions of testing temperature, sand moisture content, and normal stress through temperature-controlled direct shear tests. The results reveal that the shear stress-shear displacement curves for the sand-GT1 and sand-GM interfaces can be broadly categorized into an elastic deformation stage, a nonlinear growth stage, and a stable stage. However, the sand-GT2 interface displays a continuously increasing trend throughout the experiment. The peak friction angles of the interfaces increase significantly as the temperature decreases, following the order GT1 > GT2 > GM. The average residual friction angle of sand with GT1, GT2, and GM decreased by 14.8%, 10.4%, and 31.1%, respectively, compared to the peak friction angle. The peak cohesion at the sand-GM interface is relatively weaker than that at the sand-GT1 and sand-GT2 interfaces. The shear mechanisms between frozen soil and geotextiles involve ice cementation, rolling, interlocking, and fiber tensioning, while the shear mechanisms between frozen soil and GM comprise ice cementation, rolling, indentation, and plowing.

通过控温直剪试验，研究了不同试验温度、砂含水率和法向应力条件下，砂与短纤维非织造土工布（GT1）、长纤维非织造土工布（GT2）和土工膜（GM）界面的剪切性能。结果表明：砂土- gt1和砂土- gm界面的剪切应力-剪切位移曲线大致可分为弹性变形阶段、非线性生长阶段和稳定阶段；但在整个试验过程中，砂- gt2界面呈现不断增大的趋势。随着温度的降低，界面的峰值摩擦角显著增大，其顺序为GT1 >；GT2的在与峰值摩擦角相比，GT1、GT2和GM的平均残余摩擦角分别下降了14.8%、10.4%和31.1%。砂- gm界面的黏聚力峰值相对弱于砂- gt1和砂- gt2界面。冻土与土工布之间的剪切机制包括冰胶结、滚动、互锁和纤维张拉，冻土与转基因之间的剪切机制包括冰胶结、滚动、压痕和犁耕。

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引用次数: 0

EDITORIAL: Best papers published in Geotextiles and Geomembranes in 2023 社论：2023年发表在土工织物和土工膜上的最佳论文

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2024-11-29 DOI: 10.1016/j.geotexmem.2024.11.012

引用次数: 0

Hydro-mechanical behaviour of composite-geosynthetic-reinforced soil walls with marginal lateritic backfills through instrumented model tests 通过仪器模型试验研究边缘红土回填的复合土工合成材料加固土墙的水力学行为

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2024-11-26 DOI: 10.1016/j.geotexmem.2024.11.007

K.A. Dhanya, P.V. Divya

To examine the hydro-mechanical behavior of Geosynthetic Reinforced Soil Walls (GRSW) backfilled with locally available marginal lateritic soils, physical model tests were conducted during construction, surcharge loading, and rainfall infiltration. Various reinforcements were tested, including a conventional geogrid (GG) and two types of composite geosynthetic reinforcements (CGR) with equivalent stiffness but different configurations. The results showed that suction was maintained throughout surcharging, but during rainfall infiltration, the GG model lost suction after 12,240 min, while both CGRs retained it. Strain evaluations indicated that all reinforcements remained within serviceability limits during surcharging, but the GG model exceeded these limits during rainfall, while the CGRs stayed within acceptable limits with minimal strain increases. Additionally, the GG model showed a 61% increase in facing deformation during rainfall, exceeding serviceability limits, whereas the CGRs remained within permissible limits. The study emphasizes the importance of cautious use of marginal soils in backfill applications. These soils can still be suitable for GRSW when reinforced with composite geosynthetics, especially CGR made of polyester geogrids with non-woven geotextile bonded longitudinally to the polyester strips. This configuration demonstrated superior performance by reducing facing deformation through better drainage and improved soil-reinforcement interaction.

为了研究土工合成材料加固土墙（GRSW）的水力机械行为，我们在施工、附加荷载和降雨渗透期间进行了物理模型试验。测试了各种加固材料，包括传统的土工格栅（GG）和两种刚度相当但结构不同的复合土工合成材料（CGR）。结果表明，在整个充水过程中都保持了吸力，但在降雨渗透过程中，GG 模型在 12 240 分钟后失去了吸力，而两种 CGR 都保持了吸力。应变评估结果表明，所有钢筋在加载过程中都保持在可使用范围内，但 GG 模型在降雨过程中超过了可使用范围，而 CGR 则保持在可接受范围内，应变增加极小。此外，GG 模型在降雨期间表面变形增加了 61%，超过了适用性限制，而 CGR 仍在允许范围内。这项研究强调了在回填应用中谨慎使用边缘土壤的重要性。如果使用复合土工合成材料，特别是由聚酯土工格栅和纵向粘接在聚酯条上的无纺土工织物组成的 CGR，对这些土壤进行加固，它们仍然可以适用于 GRSW。这种结构通过更好的排水和改善土壤与加固材料之间的相互作用，减少了表面变形，表现出卓越的性能。

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引用次数: 0

Rate-dependent tensile response of Polyvinyl Chloride geomembranes 聚氯乙烯土工膜随速率变化的拉伸响应

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2024-11-25 DOI: 10.1016/j.geotexmem.2024.11.004

Nesrin Akel , Guillaume Stoltz , Antoine Wautier , François Nicot , Nathalie Touze

One of the challenge that face the effectiveness of Polyvinyl Chloride geomembranes (PVC GMs) as a hydraulic barrier is the capacity to withstand unexpected mechanical actions, particularly tensile forces, during installation and throughout their lifespan. These forces pose risks of premature failure and impermeability degradation. In this study, the characterization of the short and long-term mechanical response of PVC GMs to uniaxial tensile forces has been investigated. Uniaxial tensile test have been performed for tensile rates spanning several orders of magnitude. Analysis of the true stress-strain curves reveals a significant decrease in tensile modulus, strength, and strain at failure at low strain rates, which are relatively close to those applied in situ. Long-term investigations have been conducted as well, through relaxation tests. Our key results unveil two distinct characteristic times in stress relaxation, with the fast relaxation occurring over the first 4 h. During this phase, the pre-relaxation loading rate affects the relaxation behavior. Beyond this phase, the relaxation behavior becomes independent from the pre-relaxation loading rate. Burger's rheological model is proposed to measure the stress relaxation at different rates. The model's results validate the existence of two characteristic times.

聚氯乙烯土工膜（PVC GMs）作为水力屏障所面临的挑战之一，是在安装过程中和整个使用寿命期间能否承受意外的机械作用，尤其是拉伸力。这些力会造成过早失效和防渗性能下降的风险。本研究调查了聚氯乙烯聚甲基丙烯酸酯对单轴拉伸力的短期和长期机械响应特性。单轴拉伸试验的拉伸率跨越了几个数量级。对真实应力-应变曲线的分析表明，在低应变速率下，拉伸模量、强度和失效时的应变都会显著下降，而这些应变速率与现场应用的应变速率相对接近。我们还通过松弛试验进行了长期研究。我们的主要结果揭示了应力松弛的两个不同特征时间，快速松弛发生在最初的 4 小时内。过了这一阶段，松弛行为与松弛前加载速率无关。我们提出了 Burger 流变模型来测量不同速率下的应力松弛。该模型的结果验证了两个特征时间的存在。

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引用次数: 0

Microscale analysis of geomembrane–geotextile interface cyclic shear behavior using DEM 利用 DEM 对土工膜-土工织物界面循环剪切行为进行微观分析

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2024-11-25 DOI: 10.1016/j.geotexmem.2024.11.009

Jian Wu , Ya-Qiong Wang , Shi-Jin Feng

Given that the material-wearing process is the key factor influencing the dynamic shear strength at the interface between the geomembrane (GMB) and nonwoven geotextile (NWGT), this study investigates the cyclic shear behavior of the GMB–NWGT interface from a microscale perspective using the three-dimensional discrete element method (DEM). The textured GMB is simulated with breakable asperities and the thermally bonded NWGT is generated by spatially randomly distributed fibers which could be stretched and untangled. The established model is validated against the experimental data. The wearing process during cyclic loading is evaluated by quantifying the embedded depth of GMB asperities and fiber breakage within NWGT. The simulation results demonstrate that the maximum asperity embedment (inter-embedding effect), affected by the normal stress and displacement amplitude, induces the hook and loop interactions between asperities and fibers (inter-locking effect), accounting for the cyclic shear resistance at the interface. The inter-locking effect dominates the strain-hardening behavior of the GMB–NWGT interface when the percentage of inter-fiber bond breakage is less than 22% and the maximum asperity embedment ratio is lower than 60%; otherwise, the inter-embedding effect dominates the strain-softening behavior of the interface.

鉴于材料磨损过程是影响土工膜（GMB）和无纺土工布（NWGT）界面动态剪切强度的关键因素，本研究采用三维离散元素法（DEM）从微观角度研究了 GMB-NWGT 界面的循环剪切行为。模拟的纹理 GMB 具有可断裂的尖角，热粘合 NWGT 由空间随机分布的纤维生成，这些纤维可以拉伸和松开。所建立的模型与实验数据进行了验证。通过量化 GMB 突起的嵌入深度和 NWGT 内的纤维断裂情况，对循环加载期间的磨损过程进行了评估。模拟结果表明，受到法向应力和位移振幅的影响，最大渐开线嵌入深度（嵌入间效应）诱发了渐开线和纤维之间的钩环相互作用（锁定间效应），从而产生了界面上的循环剪切阻力。当纤维间结合断裂的百分比小于 22% 且最大非晶体嵌入比小于 60% 时，互锁效应将主导 GMB-NWGT 界面的应变硬化行为；反之，互嵌效应将主导界面的应变软化行为。

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引用次数: 0

Full-scale testing and monitoring of geosynthetics-stabilized flexible pavement in Alberta, Canada 在加拿大阿尔伯塔省对土工合成材料稳定柔性路面进行全面测试和监测

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2024-11-21 DOI: 10.1016/j.geotexmem.2024.11.003

Mian Huang , Jiming Liu , Sanat K. Pokharel , Taylor Dagenais , Arghya Chatterjee , Cheng Lin

Freeze-thaw (F-T) cycles are a primary contributor of pavement damages in seasonal frost regions. Geosynthetics stabilization has been a promising solution for enhancing the roadways performance in cold regions. However, in comparison with the practical applications, research on the geosynthetics stabilization in cold-region roads is scarce and its efficacy is yet to be quantified. This study presents the full-scale test on geosynthetics-stabilized sections in a flexible pavement in Sturgeon County, Alberta. It focused on the investigation of three separate test sections with bases stabilized by two types of geocells and one geogrid composite, each fully instrumented with earth pressure cells, thermocouples, and moisture sensors. This experimental program consisted of plate loading tests and trafficking tests on each test section before and after the first F-T season, and monitoring of soil temperatures, moisture contents, and loads transferred to subbases while the sections were open to general traffic. The results showed seasonal F-T cycles resulted in increased pavement settlement, decreased load transfer ratio, and increased stress distribution angle under the plate loading. The traffic-induced stress on the subbases increased during the spring thaw but decreased afterwards.

冻融循环是造成季节性霜冻地区路面损坏的主要原因。土工合成材料加固一直是提高寒冷地区路面性能的一种可行解决方案。然而，与实际应用相比，有关土工合成材料在寒冷地区道路中的稳定作用的研究很少，其效果也有待量化。本研究对阿尔伯塔省斯特金县柔性路面中的土工合成材料稳定路段进行了全面测试。该研究重点调查了三个独立的试验路段，其路基由两种土工格室和一种土工格栅复合材料加固，每个路段都配备了土压力传感器、热电偶和湿度传感器。该实验计划包括在第一个 F-T 季节前后对每个试验段进行板载试验和贩运试验，并在试验段开放供一般交通使用时对土壤温度、含水量和转移到路基上的荷载进行监测。结果表明，F-T 季节性循环导致路面沉降增加、荷载传递率降低，以及平板荷载下应力分布角增大。在春季解冻期间，路基上由交通引起的应力增加，但在解冻之后应力减少。

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引用次数: 0