Geotextiles and Geomembranes最新文献_第10页

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。

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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。

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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。

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引用次数: 0

Experimental and consolidation modeling of flowing mud during vacuum preloading considering transient clogging and vacuum pressure attenuation 考虑瞬态堵塞和真空压力衰减的真空预压流动泥浆试验与固结模型

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-02-11 DOI: 10.1016/j.geotexmem.2025.02.001

Yuefu Zhou , Rui Chen , Yuanqiang Cai , Jun Wang , Peng Wang , Dong Su , Xiangsheng Chen

The non-uniform dense soil column that forms around plastic drainage plates when using vacuum preloading to treat flowing mud exhibits varying clogging along the extension direction, which severely lowers both the consolidation effectiveness and rate of consolidation. A transient clogging model is established based on indoor tests conducted under varying vacuum pressure for analyzing the evolution and impact of soil column along the plastic drainage plate direction. The study reveals that the vacuum pressure attenuation alters soil water content, density, and permeability, resulting in the formation of a “carrot-shaped” clogging zone, which adversely affects the drainage rate and consolidation uniformity. Building on the transient clogging model, a vacuum consolidation analysis method is proposed taking into accounting for the nonlinear vacuum transfer and soil characteristics. The validity of the proposed method is confirmed through case studies, accompanied by a detailed parameter analysis and discussion.

真空预压处理流动泥浆时，在塑料排水板周围形成的非均匀致密土柱沿延伸方向呈现不同程度的堵塞，严重降低了固结效果和固结速率。通过室内变真空压力试验，建立了瞬态堵塞模型，分析了土柱沿塑料排水板方向的演变及影响。研究表明，真空压力衰减改变了土壤含水量、密度和渗透率，形成“胡萝卜形”堵塞带，对排水速率和固结均匀性产生不利影响。在暂态堵塞模型的基础上，提出了考虑非线性真空传递和土体特性的真空固结分析方法。通过实例分析，并进行了详细的参数分析和讨论，验证了所提方法的有效性。

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引用次数: 0

Optimal design and application of geogrid for ballasted track stabilization in high-speed railways 高速铁路有碴轨道稳定土工格栅优化设计与应用

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-02-10 DOI: 10.1016/j.geotexmem.2025.02.002

Zheng Luo , Shun Liu , Xuecheng Bian , Chuang Zhao , Yunmin Chen

This study investigates the optimal design parameters and installation location for geogrid stabilization in ballasted tracks under high-speed train loads. By integrating discrete element simulations with full-scale model tests, the performance of ballasted tracks was evaluated across various geogrid aperture sizes, stiffnesses, and installation locations. Multiple ballast gradations and trackbed compaction levels were also analyzed to ensure the generality of the results. The discrete element simulations indicate that a geogrid with an aperture size-to-median ballast gravel size ratio of 0.83 and a stiffness of approximately 2.3 kN/m is most effective in minimizing trackbed settlement. Furthermore, installing the geogrid immediately above the subballast surface provides the greatest constraints on ballast displacement and rotation, while most effectively reducing trackbed settlement. Full-scale model tests involving millions of wheel-axle load cycles at moving speeds of up to 360 km/h and axle loads of up to 25 t corroborate these findings, confirming the reliability and practical applicability of the optimal geogrid parameters and installation locations identified through discrete element simulations. This research offers evidence-based guidelines for optimal design of geogrid-stabilized ballasted tracks under practical railway service conditions, thereby extending maintenance intervals and improving long-term performance.

研究了高速列车荷载作用下有砟轨道土工格栅稳定的最佳设计参数和安装位置。通过将离散单元模拟与全尺寸模型试验相结合，在不同的土工格栅孔径大小、刚度和安装位置下，对有碴轨道的性能进行了评估。为了确保结果的通用性，还分析了多个压载物级配和履带压实水平。离散单元模拟结果表明，孔径尺寸与道砟砾石中位尺寸比为0.83、刚度约为2.3 kN/m的土工格栅最有效地减小了履带沉降。此外，将土工格栅直接安装在压载物表面上方，可以最大限度地限制压载物的位移和旋转，同时最有效地减少履带沉降。在高达360公里/小时的移动速度和高达25吨的轴载荷下，进行了数百万轮轴载荷循环的全尺寸模型测试，证实了这些发现，证实了通过离散单元模拟确定的最佳土工格栅参数和安装位置的可靠性和实用性。该研究为实际铁路服务条件下土工格栅稳定有碴轨道的优化设计提供了循证指导，从而延长了维护间隔，提高了长期性能。

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引用次数: 0

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