Geotextiles and Geomembranes最新文献_第4页

Impact of test speed on the thermo-mechanical behavior of various types of geomembranes 试验速度对各类土工膜热力学性能的影响

IF 6.2 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-08-25 DOI: 10.1016/j.geotexmem.2025.08.002

Hamza Tahir, Guillaume Stoltz, Guillaume Veylon, Laurent Peyras

Geomembranes in hydraulic structures are often in exposed conditions; the ambient temperature can vary significantly and hence influence their mechanical behavior. To determine their tensile behavior at various temperatures, unidirectional tensile tests can be performed in temperature-controlled chambers. However, the test speeds recommended by the main standards are high. Considering the elasto-visco-plastic behavior of geomembranes, the test speed has a double effect; the first comes from the viscous component and the second comes from temperature variation, due to the self-heating of the tested specimen during test. This study aims to investigate the effect of the test speed on the mechanical behavior of various geomembranes by decoupling the viscous effect and the self-heating effect. Through various unidirectional tensile tests performed on a wide range of test speeds, from 0.01 mm/min to 500 mm/min, it was found that for various tested geomembranes (HDPE, EPDM, PVC, FPO, Bituminous), the higher the test speed, the greater the tensile force at various strain levels and the greater the change in internal temperature of the specimen. Regarding the temperature effect, it was shown that for test speeds less than or equal to 10 mm/min, no self-heating of the specimen was observed for all geomembranes.

水工构筑物中的土工膜常处于暴露状态；环境温度变化很大，因此会影响它们的力学行为。为了确定它们在不同温度下的拉伸性能，单向拉伸试验可以在温控室中进行。然而，主要标准推荐的测试速度很高。考虑土工膜的弹粘塑性特性，试验速度具有双重效应；第一种来自粘性成分，第二种来自温度变化，这是由于测试过程中被测试样的自热造成的。本研究旨在通过解耦粘性效应和自热效应来研究测试速度对土工膜力学行为的影响。通过在0.01 mm/min ~ 500 mm/min较宽的试验速度范围内进行的各种单向拉伸试验，发现对于各种土工膜（HDPE、EPDM、PVC、FPO、沥青），试验速度越高，各应变水平下的拉伸力越大，试件内部温度变化越大。关于温度效应，结果表明，当测试速度小于或等于10 mm/min时，所有土工膜都没有观察到试样的自热现象。

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引用次数: 0

Chemical-enhanced electrokinetic geosynthetics (EKG) electro-osmosis combined with vacuum preloading for consolidation and copper remediation in contaminated dredged sludge 化学增强电动土工合成（EKG）电渗透结合真空预压在污染疏浚污泥中的固结和铜修复

IF 6.2 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-08-25 DOI: 10.1016/j.geotexmem.2025.08.008

Yang Shen , Nihao Wei , Kewei Fan , Wencheng Qi , Jianting Feng , Zhiqiang Lai

Chemical-enhanced electrokinetic geosynthetics (EKG) electro-osmosis combined with vacuum preloading was employed to simultaneously consolidate and remediate copper-contaminated dredged sludge. Five chemical additives—citric acid, tartaric acid, hydrogen peroxide, rhamnolipids, and sodium chloride—were systematically evaluated via model tests. Results show that all additives improve both drainage and copper removal, with sodium chloride exhibited the enhancement in dewatering performance, while rhamnolipid achieved the highest copper removal efficiencies. Mechanistic analysis revealed that chemical additives improved sludge dewatering by enhancing pore water migration—through modifying soil structure, increasing ionic conductivity, or reducing surface tension. They also promoted copper removal by altering speciation: acidic chelating agents reduced pH and stabilized Cu²⁺ in soluble complexes, suppressing precipitation, while in near-neutral conditions, cathodic OH⁻ dissolved Cu(OH)₂ into mobile species, facilitating transport. Energy analysis confirmed that chemical-enhanced systems improved the energy efficiency of copper removal. These findings support the integrated use of EKG electro-osmosis combined with vacuum preloading, coupled with appropriate chemical agents, as a viable and energy-efficient strategy for the remediation of heavy metal-contaminated dredged sludge.

采用化学增强电动土工合成材料（EKG）电渗透与真空预压相结合的方法，对铜污染的疏浚污泥进行了同步固结和修复。五种化学添加剂——柠檬酸、酒石酸、过氧化氢、鼠李糖脂和氯化钠——通过模型试验进行了系统的评价。结果表明，各添加剂均能提高脱铜效果，其中氯化钠对脱铜效果有增强作用，鼠李糖脂的脱铜效果最好。机理分析表明，化学添加剂通过改变土壤结构、增加离子电导率或降低表面张力来增强孔隙水迁移，从而改善污泥脱水。它们还通过改变形态来促进铜的去除：酸性螯合剂降低pH值，稳定可溶性配合物中的Cu2+，抑制沉淀，而在接近中性的条件下，阴极OH−将Cu(OH)2溶解成可移动的形态，促进运输。能量分析证实，化学增强系统提高了除铜的能源效率。这些发现支持将心电图电渗透与真空预压相结合，再加上适当的化学剂，作为一种可行且节能的策略来修复重金属污染的疏浚污泥。

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引用次数: 0

Effect of temperature on geogrid-facing connection force and lateral earth pressure based on innovative testing method 基于创新测试方法的温度对土工格栅连接力和侧土压力的影响

IF 6.2 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-08-23 DOI: 10.1016/j.geotexmem.2025.08.007

Huaxin Han , Chengzhi Xiao , Jianguang Yin , Nan Zhu

Conventional geosynthetic-reinforced soil (GRS) retaining wall design guidelines focus on the horizontal reinforcement tensile force calculated based on lateral earth pressure under constant backfill temperature, while giving insufficient attention to the actual connection mechanism between the wall facing and the reinforcement. This limitation may impact the service life of retaining walls. In this study, a novel testing method was developed to simulate the differential settlement between the backfill and the facing within walls, enabling a new approach to quantify the reinforcement-facing connection force under various temperature conditions. Test results demonstrated that this connection force significantly exceeds the measured horizontal reinforcement tensile force under high vertical stress, and the ratio tends to increase with rising temperature under the same vertical stress. Additionally, the lateral earth pressure exerted on the wall back increases with the reinforcement stiffness, but it remains lower than the Rankine active earth pressure. At low temperatures, the conventional estimation method based on Rankine theory was shown to significantly underestimate the actual connection force. The study provides insights for the modification of the current GRS wall design guidelines.

传统的土工合成加筋土挡土墙设计指南侧重于在一定回填温度下，根据侧土压力计算水平钢筋受拉力，而对墙面与钢筋的实际连接机制关注不足。这种限制可能会影响挡土墙的使用寿命。本研究开发了一种新的试验方法来模拟墙内充填体与面板之间的差异沉降，为量化不同温度条件下的配筋面板连接力提供了一种新的方法。试验结果表明，在高竖向应力条件下，该连接力明显大于实测水平钢筋拉伸力，且在相同竖向应力条件下，该比值随温度升高而增大。加筋后墙侧土压力随加筋刚度增大而增大，但仍低于朗肯主动土压力。在低温下，传统的基于朗肯理论的估计方法明显低估了实际连接力。该研究为修改现行的GRS墙体设计指南提供了见解。

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引用次数: 0

Laboratory evaluation of water absorption and drainage performance of a new wicking geotextile in loess-sand mixtures 一种新型吸湿土工布在黄土-砂混合材料中的吸水和排水性能的实验室评价

IF 6.2 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-08-22 DOI: 10.1016/j.geotexmem.2025.08.003

Zhilang You , Jian Xu , Hua Liu , Yang Peng , Zhichao Zhang

Climatic warming and humidification in Northwest China have led to frequent extreme rainfall events, triggering numerous geohazards along linear infrastructure such as highways in the Loess Plateau region. A self-developed wicking geotextile with fibers featuring an irregular cross-section (14 μm in major axis, 7 μm in minor axis) was first introduced to facilitate drainage in loess-sand mixtures, thereby enhancing the strength and stability of foundations. Capillary effect and drainage tests were conducted to evaluate its water absorption and drainage performance of loess-sand mixtures with various ratios of poorly graded sand with silt. Additionally, evaporation tests were performed to assess the evaporation rate of the wicking geotextiles under different environmental conditions, including variations in temperature and humidity. The results showed that: 1) the maximum liquid vertical wicking heights of the wicking geotextiles in loess-sand mixtures increased with both sand contents and initial water contents; 2) the evaporation rate decreased with increasing humidity, but increased with increasing temperature; 3) Under simulated extreme rainfall, the drainage efficiency of the wicking geotextile improved with greater sand content. The drainage mechanisms of the wicking geotextiles in loess-sand mixtures were analyzed based on fibers’ microstructure. This study contributes to geohazard mitigation in the Loess Plateau.

西北地区气候变暖加湿导致极端降雨事件频发，引发黄土高原地区公路等线性基础设施沿线地质灾害频发。首次引入自主研发的不规则截面纤维（长轴14 μm，短轴7 μm）抽芯土工布，促进黄土-砂混合物的排水，从而提高基础的强度和稳定性。通过毛细效应和排水试验，评价了不同分级差砂与粉砂配比的黄土-砂混合材料的吸水排水性能。此外，还进行了蒸发试验，以评估吸湿土工布在不同环境条件下的蒸发速率，包括温度和湿度的变化。结果表明：1)黄土-砂土混合中吸湿土工布的最大液体垂直吸湿高度随含砂量和初始含水量的增加而增加；2)蒸发速率随湿度的增加而减小，随温度的升高而增大；3)在模拟极端降雨条件下，随着含砂量的增加，吸芯土工布的排水效率提高。从纤维微观结构出发，分析了吸湿土工布在黄土-砂混合料中的排水机理。该研究对黄土高原的地质灾害减灾具有重要意义。

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引用次数: 0

Dynamic properties of sand reinforced with non-woven geotextile sheets using resonant column and bender elements tests 用共振柱和弯曲单元试验研究非织造土工布板加筋砂的动力特性

IF 6.2 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-08-05 DOI: 10.1016/j.geotexmem.2025.07.012

Sandyapogu Peddaiah, Jyant Kumar

This study examines an inclusion of non-woven polypropylene geotextiles sheets on dynamic properties of dry sand. Resonant column (RC), bender and extender elements (BE, EE) tests were conducted on sand reinforced with different numbers of geotextile sheets (

N_{g t s}

) under varying confining pressures. The inclusion of geotextile sheets significantly increases not only the shear modulus (

G

) but also the damping ratio (

D

) of the reinforced sand specimen. As compared to the data reported in literature, although geotextiles with lesser tensile strength were being employed in the current research, the percentage increases in the values of G were, however, found to be relatively greater. The inclusion of geotextile also leads to a reduction in the amplitude of the shear strain (

γ

). The values of shear and Young's moduli (

G_{0}, E_{0}

) determined respectively from BE and EE tests also confirm the improvement in moduli values for sand reinforced with geotextile sheets. The improvement in Young's modulus is found to be, however, relatively smaller. The effect of an inclusion of geotextile sheets on (i) percentage increase in

G_{0}

and percentage decrease in

γ_{\min}

increases continuously with an increase in

σ_{3}

, and (iii) percentage increase in

D_{\min}

, however, reduces with an increase in

σ_{3}

.

本研究考察了非织造聚丙烯土工布片对干砂动态性能的影响。在不同围压条件下，对不同数量的土工布（Ngts）加筋砂土进行了共振柱（RC）、弯管和扩展单元（BE、EE）试验。土工布片材的加入不仅显著提高了加筋砂试件的剪切模量G，而且显著提高了加筋砂试件的阻尼比D。与文献报道的数据相比，虽然在本研究中使用了抗拉强度较低的土工布，但G值的增加百分比相对较大。土工布的加入也导致剪切应变（γ）的幅度减小。从BE和EE试验中分别测定的剪切模量和杨氏模量（G0,E0）也证实了土工布加筋砂模量的改善。然而，杨氏模量的改善相对较小。随着σ3的增加，土工布片材对(1)G0的增加百分比和γmin的减少百分比的影响不断增大，而(3)Dmin的增加百分比的影响随着σ3的增加而减小。

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引用次数: 0

The role of boundary normal stiffness in the micromechanical behavior of geomembrane-sand interface: A numerical study 边界法向刚度在土工膜-砂界面细观力学行为中的作用：数值研究

IF 6.2 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-07-31 DOI: 10.1016/j.geotexmem.2025.07.011

Haibo Wang , Ge Gao , Mohamed A. Meguid , Nasser Khalili , Lulu Zhang

Three-dimensional discrete element method (DEM) is employed to investigate how boundary normal stiffness influences the shearing behavior at the soil-geomembrane interface. A robust and efficient algorithm was developed and implemented into direct shear numerical models, effectively capturing the key aspects of the sand-geomembrane interface behavior across a wide range of boundary normal stiffness values. The numerical model was validated by comparing the bulk responses of interface shear stress and volume change versus shear displacement with experimental data. At the microscale, particle displacements, rotations, contact network evolution, coordination number, redundancy factor and elastic stiffness tensor were investigated to shed light on the impact of normal stiffness on the interface response. The micromechanical insights, such as the development of higher level of geometrical and mechanical anisotropy, stronger interface interlocking to resist sliding and rolling of sand particles, and increased local density and bulk stiffness, are connected to the macroscopic response, explaining how higher boundary normal stiffness enhances interface shear strength and normal stress during shearing.

采用三维离散元法研究了边界法向刚度对土工膜界面剪切性能的影响。开发了一种鲁棒且高效的算法，并将其应用于直接剪切数值模型中，有效地捕获了在大范围的边界法向刚度值范围内砂-土工膜界面行为的关键方面。将界面剪应力和体积变化随剪切位移的体响应与实验数据进行对比，验证了数值模型的正确性。在微观尺度上，研究了颗粒位移、旋转、接触网络演化、配位数、冗余因子和弹性刚度张量，揭示了法向刚度对界面响应的影响。微观力学的见解，如更高水平的几何和力学各向异性的发展，更强的界面联锁以抵抗砂粒的滑动和滚动，以及增加的局部密度和体刚度，与宏观响应有关，解释了更高的边界法向刚度如何提高界面抗剪强度和剪切过程中的法向应力。

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引用次数: 0

Degradation of polyethylene geomembranes exposed to different mine tailings pore waters 聚乙烯土工膜在不同尾矿孔隙水中的降解研究

IF 6.2 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-07-30 DOI: 10.1016/j.geotexmem.2025.07.006

Rodrigo A. e Silva, R. Kerry Rowe, Fady B. Abdelaal

The chemical durability of three 1.5 mm geomembranes (GMBs) – two made from high-density polyethylene (HDPE) and one from a blended polyolefin resin – was examined over 3 years in synthetic tailings pore water solutions. The immersion solutions included a pH 4.0 solution simulating pore water from oxidized copper-zinc mine tailings (PW-4), pH 7.0 (PW-7) and 8.0 (PW-8) solutions simulating arsenic-bearing pore waters from saturated gold mine tailings, and a pH 9.5 solution (PW-9.5) simulating pore water affected by cyanide complexes and/or chemicals from a cyanidation plant. Both HDPE GMBs reached nominal failure in stress-crack resistance at 85 °C, followed by reductions in melt index and, in some cases, tensile strength. The blended GMB showed no degradation. PW-7 was the most aggressive solution in terms of degradation of mechanical properties of the HDPEs, while PW-9.5 was the most aggressive for antioxidant depletion for all three GMBs. The relative performance of the three GMBs in different tailings pore waters could not be predicted from the GMBs’ initial properties or the solutions' chemistry. Overall, results highlight the importance of conducting immersion tests for applications involving complex chemical environments.

三种1.5毫米土工膜（gmb）——两种由高密度聚乙烯（HDPE）制成，另一种由混合聚烯烃树脂制成——在合成尾矿孔隙水溶液中进行了为期3年的化学耐久性测试。浸没溶液包括pH为4.0的模拟氧化铜锌矿尾矿（PW-4）孔隙水的溶液，pH为7.0 （PW-7）和8.0 （PW-8）的模拟饱和金矿尾矿含砷孔隙水的溶液，以及pH为9.5的模拟氰化厂氰化物配合物和/或化学品影响孔隙水的溶液（PW-9.5）。在85℃时，两种HDPE gmb的抗应力开裂性能均达到了标称失效，随后熔体指数下降，在某些情况下，抗拉强度也有所下降。混合后的GMB无降解现象。就hdpe的机械性能降解而言，PW-7是最严重的，而PW-9.5对所有三种GMBs的抗氧化剂消耗最为严重。三种GMBs在不同尾砂孔隙水中的相对性能不能从其初始性质或溶液化学性质来预测。总的来说，结果强调了在涉及复杂化学环境的应用中进行浸入式测试的重要性。

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引用次数: 0

Centrifuge modeling on the geosynthetic-reinforced soil (GRS) abutments with different combinations of reinforcement spacing and tensile stiffness 土工合成加筋土（GRS）桥台不同配筋间距和抗拉刚度组合的离心模拟

IF 6.2 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-07-29 DOI: 10.1016/j.geotexmem.2025.07.009

Qingming Wang , Chao Xu , Geye Li , Panpan Shen , Chongxi Zhao

Three centrifuge model tests were conducted to investigate the performance of geosynthetic reinforced soil (GRS) abutments with modular block facing under localized vertical loads. This study examined the effects of different combinations of reinforcement spacing S_v and tensile stiffness J on the behavior of GRS abutments. In this study, river sand and woven geotextiles were used as the backfill soil and reinforcement material, respectively. Test results show that under the same ratio of J/S_v = 3.7, using the combination of smaller S_v and lower J was more effective in minimizing the beam seat settlements and the lateral facing displacements induced by localized vertical loads than the combination of larger S_v and higher J. Meanwhile, smaller additional vertical stresses transferred from the applied loads within the GRS abutment and smaller reinforcement tensile forces were also observed for the combination of smaller S_v and lower J. Furthermore, the maximum tensile forces in each layer occurred under the beam seat for the upper reinforcement layers and near the facing for the lower layers for all three tests. A more uniform distribution of the reinforcement tensile force was found for the combination of smaller S_v and lower J.

采用离心模型试验方法，研究了组合式砌块土工合成加筋土桥台在局部竖向荷载作用下的性能。研究了不同配筋间距Sv和抗拉刚度J组合对GRS基台性能的影响。本研究采用河砂作为回填土，采用编织土工布作为加固材料。试验结果表明，在相同J/Sv = 3.7的情况下，较小Sv和较低J的组合比较大Sv和较高J的组合更能有效地减小梁座沉降和局部竖向荷载引起的侧向位移。在较小的Sv和较低的j值组合下，GRS桥台内附加荷载传递的附加垂直应力较小，钢筋拉力较小。此外，在所有三种试验中，每一层的最大拉力都出现在上层钢筋层的梁座下方，下层钢筋层的面板附近。较小的Sv和较低的J组合使钢筋受拉力分布更为均匀。

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引用次数: 0

Mitigating frost damage in cold region canals: performance evaluation of a two-layer geomembrane lining structure 缓解寒区水渠冻害：双层土工膜衬砌结构的性能评价

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-07-17 DOI: 10.1016/j.geotexmem.2025.07.008

Jianrui Ge , Yuncheng Yuan , Haoyuan Jiang , Zhengzhong Wang , Yi Wang , Min Xiao

To address frost damage to canal lining structures in arid and cold regions, this study proposes the use of a two-layer composite geomembranes (TLCGs) as a frost-heaving composite lining structure. To assess the performance of the two-layer geomembrane lining structure (TLCGLS), field tests were conducted. Considering the interaction between TLCGs and lining structure and canal foundation soil, a calculation model of canal frost heave is established based on the water-heat-force coupling theory of foundation soil. The stress of canal lining with single-layer composite geomembrane (SLCG), frictionless two-layer composite geomembranes (FTLCGS), and TLCGs under frost-heaving conditions is analyzed. The results indicate that TLCGLS can enhance the temperature of canal foundation soil by 7 % and decrease the water content by 12 %, thereby effectively mitigating canal deformation by 38 %. The TLCGs cushion under the canal lining can effectively release the tangential freezing constraint, so that the lining structure has certain flexibility, so as to prevent frost damage. Therefore, the reasonable use of TLCGs with appropriate friction and the setting of flexible structural joints can prevent frost damage.

为了解决干旱寒冷地区运河衬砌结构的冻害问题，本研究提出采用双层复合土工膜（tlcg）作为冻胀复合衬砌结构。为了评估双层土工膜衬砌结构（TLCGLS）的性能，进行了现场试验。考虑衬砌结构与渠道基础土的相互作用，基于基础土水-热-力耦合理论，建立了渠道冻胀计算模型。分析了冻胀条件下单层复合土工膜（SLCG）、无摩擦双层复合土工膜（FTLCGS）和TLCGs管道衬砌的应力。结果表明：TLCGLS可使运河地基土温度升高7%，含水率降低12%，有效缓解运河变形38%；运河衬砌下的tlcg垫层可以有效地解除切向冻结约束，使衬砌结构具有一定的柔韧性，从而防止冻损。因此，合理使用具有适当摩擦力的tlcg，并设置柔性结构缝，可以防止冻损。

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引用次数: 0

Centrifuge modelling of EPS geofoam behind integral bridge abutments 整体式桥台后EPS土工泡沫的离心建模

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-07-17 DOI: 10.1016/j.geotexmem.2025.07.005

Douglas G. Morley , Gopal SP. Madabhushi , Dennis Sakufiwa

This research investigates the extent to which geosynthetic compressible inclusions can be used to improve the performance of integral bridges. Geotechnical centrifuge modelling was used to simulate thermal movements acting on a 9 m abutment on a spread foundation, with and without a 1.2 m thick EPS geofoam inclusion. The compressible inclusion was found to significantly reduce the earth pressures behind the abutment generated over a 120-year design life of thermal cycles without undergoing notable permanent deformation. This resulted in the bridge deck axial force and peak abutment bending moment reaching only a third and two-thirds, respectively, of the values without the geofoam. Backfill settlement increased slightly when the compressible inclusion was used, although the peak settlement immediately behind the abutment face remained similar at around 100 mm. Through the application of extreme displacement amplitudes, it was found that the performance of EPS geofoam was not overly sensitive to permanent deformation, which was concentrated behind the top half of the abutment. By providing partial isolation, rather than accommodating thermal movements in their entirety, these results suggest that EPS geofoam can improve integral bridge performance even when subjected to large thermal movements.

本研究探讨了土工合成可压缩包体用于改善整体桥梁性能的程度。采用土工离心机模型，模拟了在有和没有1.2 m厚EPS土工泡沫包体的基础上，作用于9 m基台的热运动。在120年的热循环设计寿命中，可压缩包体显著降低了桥台背后产生的土压力，而不会发生明显的永久变形。这导致桥面轴力和峰值桥台弯矩分别仅达到未加土工泡沫时的三分之一和三分之二。当采用可压缩包裹体时，充填体沉降略有增加，但紧靠桥台后的峰值沉降保持在100 mm左右。通过极值位移幅值的应用，发现EPS土工泡沫塑料的性能对永久变形不太敏感，永久变形集中在桥台上半部分后。通过提供部分隔离，而不是完全容纳热运动，这些结果表明，即使在遭受大的热运动时，EPS土工泡沫也可以改善整体桥梁性能。

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引用次数: 0