Geotextiles and Geomembranes最新文献_第7页

Consolidation solution of ground improved with artificial solidified crust–vertical drain 人工固化结皮改善地基固结液-垂直排水

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-05-20 DOI: 10.1016/j.geotexmem.2025.05.003

Long Chen , Desheng Li , Yonghui Chen , Yi Zhu , Kaizhe Shang

For artificial solidified crust (ASC)–vertical drain ground, an analytical consolidation solution (IB solution: regarding ASC as an impervious boundary) is proposed, which considers both the radial and vertical seepage. The orthogonal relation is proven and the computing efficiency is greatly improved. Then, consolidation solutions applicable to ASC–vertical drain ground, include IB solution, RDL solution (radial consolidation solution of double-layered ground) by Li et al. (2025), the quasi-rigorous solution by Tang and Onitsuka (2001), are compared and discussed. Compared to the quasi-rigorous solution, IB solution slightly overestimates the consolidation rate, but it can be promoted in engineering according to the following reasons: a) the convergence is easier to be achieved; b) its accuracy is not affected by the ratio of the vertical time factor to the radial time factor; c) common major parameters of ASC (i.e., thickness and permeability) have little effect on the applicability. By ignoring the vertical seepage in soil, IB solution degenerates to the simplified solution. Consolidation rate calculated by the simplified solution is slower than that of IB solution, and the solution can be a simple method for estimating the consolidation behavior of ASC–vertical drain ground.

针对人工固化壳(ASC) -垂直排水地基，提出了考虑径向和垂直渗流的解析固结解（IB解：以ASC为不透水边界）。证明了正交关系，大大提高了计算效率。然后对适用于asc垂直排水地基的固结方案，包括IB方案、Li等人（2025）的RDL方案（双层地基径向固结方案）、Tang和Onitsuka（2001）的准严格方案进行了比较和讨论。与拟严格解相比，IB解对固结率的估计略高，但在工程上可以推广，原因如下：a)收敛性更容易实现；B)其精度不受垂直时间因子与径向时间因子之比的影响；c) ASC常用主要参数（即厚度和渗透率）对适用性影响不大。忽略土中的竖向渗流，IB解退化为简化解。简化解计算出的固结速率比IB解计算出的固结速率要慢，可以作为一种简便的估算asc -竖向排水地基固结特性的方法。

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引用次数: 0

Response of isolated footing on a geogrid reinforced fill and undisturbed peat subgrade soil system 土工格栅加筋填土-原状泥炭基土体系隔震基础响应

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-05-17 DOI: 10.1016/j.geotexmem.2025.05.001

Aykut Erol, Zulkuf Kaya

The geotechnical behavior of undisturbed peat subgrade within geogrid-reinforced foundation systems remains inadequately understood, despite its high compressibility and engineering complexities. This study conducts a systematic investigation into the bearing capacity and settlement characteristics of an isolated footing on geogrid-reinforced fill over undisturbed peat, utilizing laboratory-scale model tests. Unlike previous studies that rely on disturbed peat samples, this research preserves natural stratification and in-situ response mechanisms, providing a more accurate representation of reinforcement performance. The results demonstrate that geogrid reinforcement enhances bearing capacity by up to 149.7 % and mitigates settlement by 79 %, with optimal reinforcement efficiency achieved at h/B = 0.3. These findings underscore the critical role of geogrid embedment depth, fill thickness, and relative density in optimizing foundation stability. By integrating undisturbed peat in physical modeling, this study bridges the gap between controlled laboratory experiments and real-world geotechnical applications, providing a framework for optimizing geosynthetic reinforcement strategies in highly compressible subgrades and paving the way for more reliable foundation designs in challenging ground conditions.

土工格栅加固基础体系中未受扰动泥炭地基的岩土力学特性仍未得到充分的了解，尽管其具有高压缩性和工程复杂性。本研究利用实验室规模的模型试验，对未受扰动泥炭上土工格栅加筋填筑隔震基础的承载力和沉降特性进行了系统的研究。与以往依赖于扰动泥炭样品的研究不同，本研究保留了自然分层和原位响应机制，提供了更准确的加固性能表征。结果表明：加筋后土工格栅承载力可提高149.7%，沉降可降低79%，当h/B = 0.3时，加筋效率最佳；这些发现强调了土工格栅嵌入深度、填充厚度和相对密度在优化基础稳定性中的关键作用。通过将未受干扰的泥炭整合到物理模型中，本研究弥合了受控实验室实验与现实岩土工程应用之间的差距，为优化高压缩性路基的土工合成加固策略提供了框架，并为在具有挑战性的地面条件下进行更可靠的基础设计铺平了道路。

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引用次数: 0

Investigation on relationship of geogrid strain and settlement in the GRPS embankment under cyclic loading 循环荷载作用下GRPS路堤土工格栅应变与沉降关系研究

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-05-09 DOI: 10.1016/j.geotexmem.2025.04.005

Kaifu Liu, Shiyu Xu, Zhangbo Wan, Minjie Wen, Kairen Xue

Geosynthetic-reinforced pile-supported (GRPS) embankments provide an effective solution for mitigating subgrade settlement and enhancing service performance. This study presents a series of physical model tests aimed at gaining a comprehensive understanding of the mechanical behavior of geogrids in GRPS embankments. Effects of loading cycles, loading frequency, geogrid layer number, and pile type on geogrid strain and settlement were investigated. An empirical formula was introduced to evaluate the impact of these factors on the relationship between geogrid strain and settlement. The results demonstrate that both geogrid strain and settlement increase with loading cycles and loading frequency, while longer piles effectively reduce settlement. GRPS embankments with two geogrid layers exhibited smaller geogrid strain and settlement compared to those with a single layer. A power function incorporating the normalized geogrid strain increment ratio and settlement was developed to predict the geogrid strain variations under cyclic loading, with significant influence from the aforementioned factors. Furthermore, an application of the EBGEO method, modified to account for cyclic loadings, is proposed, which introduces a load parameter to account for the number of loading cycles. The results obtained using this modified method closely align with measured values, providing a more accurate estimation of geogrid strain development under cyclic loading.

土工合成增强桩支撑（GRPS）路堤是缓解路基沉降和提高使用性能的有效解决方案。本研究提出了一系列物理模型试验，旨在全面了解GRPS路堤中土工格栅的力学行为。研究了加载周期、加载频率、土工格栅层数和桩型对土工格栅应变和沉降的影响。提出了一个经验公式来评价这些因素对土工格栅应变与沉降关系的影响。结果表明：土工格栅应变和沉降随加载周期和加载频率的增加而增加，而长桩能有效地降低沉降；与单层土工格栅相比，双层土工格栅路堤具有更小的土工格栅应变和沉降。建立了结合归一化土工格栅应变增量比和沉降的幂函数来预测循环荷载作用下土工格栅应变的变化，上述因素对土工格栅应变变化有显著影响。此外，还提出了EBGEO方法的一种应用，该方法经过修改以考虑循环荷载，该方法引入了一个荷载参数来考虑荷载循环次数。修正方法得到的结果与实测值吻合较好，能更准确地估计土工格栅在循环荷载作用下的应变发展情况。

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引用次数: 0

Mechanical properties and mechanisms of soil-geotextile interface under constant normal Stiffness: Effect of freezing conditions 恒法向刚度条件下土-土工织物界面力学特性及机理：冻结条件的影响

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-05-05 DOI: 10.1016/j.geotexmem.2025.04.003

Pengfei He , Ce Zhuang , Xiangbing Kong , Boyang Liu , Fuping Zhang

A set of direct shear tests on the soil-geotextile interface (SGI) were conducted using a temperature-controlled constant normal stiffness (CNS) direct shear apparatus. This was done in order to evaluate the effects of normal stiffness, initial normal stress, soil water content, and temperature on SGI shear behavior and micro-deformation patterns. The observations indicate that all shear stress-shear displacement curves demonstrate strain-hardening characteristics, with SGI cohesion and friction angle increasing at higher normal stiffness and lower temperatures. At freezing conditions, water content significantly affects the interface friction angle, while this effect is minimal at positive temperatures. Normal stress increases with higher water content, lower temperatures, and higher normal stiffness. Shear stress initially rises with normal stress before decreases, with a more pronounced rise under sub-zero conditions. Normal stress shrinkage shows a positive correlation with normal stiffness. Micro-deformation analysis of soil particles at the interface indicates significant strain localization within the shear band, which is less pronounced under sub-zero temperatures compared to positive temperatures. These patterns of normal displacement vary across analysis points within the shear band, with the macroscopic normal displacement reflecting a cumulative effect of these microscopic variations.

采用温控恒法向刚度（CNS）直剪仪对土工织物界面（SGI）进行了直剪试验。这样做是为了评估法向刚度、初始法向应力、土壤含水量和温度对SGI剪切行为和微变形模式的影响。结果表明：在较高的法向刚度和较低的温度下，剪切应力-剪切位移曲线均表现出应变硬化特征，SGI黏聚力和摩擦角增大；在冻结条件下，水含量显著影响界面摩擦角，而在正温度下，这种影响最小。随着含水量的增加、温度的降低和法向刚度的提高，法向应力也随之增加。剪应力随正应力先升高后降低，在零下条件下，剪应力的升高更为明显。法向应力收缩率与法向刚度呈正相关。界面处土体颗粒的微变形分析表明，在剪切带内存在明显的应变局部化现象，与正温度相比，在零下温度下不太明显。这些法向位移模式在剪切带内的分析点之间变化，宏观法向位移反映了这些微观变化的累积效应。

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引用次数: 0

Performance evaluation of geocell-reinforced pavements overlying black cotton soil 黑棉土上覆土工格室加筋路面性能评价

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-05-04 DOI: 10.1016/j.geotexmem.2025.04.004

Sayanti Banerjee, Bappaditya Manna, J.T. Shahu

The study conducted full-scale field trials in Dholera to examine the performance of geocell-reinforced and unreinforced pavements on expansive subgrades. Three geocell-reinforced sections (S-2 on expansive subgrade, S-4 on lime-treated subgrade, and S-5 on lime-treated subgrade with reduced base) and two unreinforced sections (S-1 on expansive subgrade and S-3 on lime-treated subgrade) were constructed. Performance was evaluated using static plate load tests and falling weight deflectometer tests. Geocell reinforcement enhances pavement bearing capacity, reduces subgrade vertical stress, and offers potential reductions in life-cycle costs and annual greenhouse gas emissions. Section S-2 showed higher bearing capacity compared to those of section S-3, highlighting the efficacy of reinforced sections over traditional stabilization. The study found that solely relying on lime treatment for expansive soil is not very effective, but combining it with geocells significantly improves pavement performance. Section S-4 showed the highest improvement in pavement performance, with a bearing capacity improvement factor of 3.04, modulus improvement factor of 2.26, and service life ratio of 2.61. The comparable performance of sections S-4 and S-5 suggests that section S-5 offers a sustainable and cost-effective alternative with satisfactory performance. Additionally, numerical analysis confirms the reliability of the field results as a valuable resource for researchers.

该研究在Dholera进行了全面的现场试验，以检查土工格室加固和未加固路面在膨胀路基上的性能。建造了3个土工格室加固段（膨胀路基的S-2、石灰处理路基的S-4和地基减少的石灰处理路基的S-5）和2个非加固段（膨胀路基的S-1和石灰处理路基的S-3）。使用静板载荷试验和下落重量挠度计试验对性能进行了评估。土工格室加固增强了路面承载能力，降低了路基垂直应力，并有可能降低生命周期成本和年度温室气体排放。S-2截面的承载力高于S-3截面，突出了加固截面相对于传统加固的有效性。研究发现，单纯依靠石灰处理膨胀土效果不佳，但与土工细胞结合使用可显著改善路面性能。S-4路段路面性能改善幅度最大，承载改善系数为3.04，模量改善系数为2.26，使用寿命比为2.61。第S-4款和第S-5款的业绩比较表明，第S-5款提供了一种业绩令人满意的可持续和具有成本效益的替代办法。此外，数值分析证实了现场结果的可靠性，为研究人员提供了宝贵的资源。

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引用次数: 0

Leakage of composite cutoff walls through geomembrane joint defects 复合防渗墙通过土工膜接缝缺陷渗漏

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-04-30 DOI: 10.1016/j.geotexmem.2025.04.002

Lin-Feng Cao, Yu-Chao Li, Bo Huang

Composite geomembrane-soil-bentonite (CGSB) cutoff walls are effective barriers to contain highly aggressive contaminated groundwater. Defects in the geomembrane (GM) joint are inevitable during the installation, inducing preferential flow paths. An experimental device is designed to measure the flow rate

Q

through the joint defects of CGSB walls. Experiments and numerical simulations are performed to investigate the leakage characteristics of CGSB walls. The results show that soil-bentonite (SB) enters the joint under pressure and has a sealing effect similar to a hydrophilic gasket, which effectively reduces the

Q

. As the hydraulic head

h_{w}

increases, the internal gap width of the joint increases, resulting in a significant increase in

Q

. When

h_{w}

increases from 1 to 2 m, the maximum increase in the measured

Q

exceeds 17.6 times. The fracture pore diameter

d_{f}

of the joint filled with SB decreases by an order of magnitude compared to the case without SB filling. When

d_{f}

is less than 0.1 mm, the leakage of the CGSB wall is mainly controlled by

d_{f}

; while

d_{f}

is greater than 0.2 mm, the leakage is mainly affected by the interface transmissivity between the GM and SB.

复合土工膜-土壤-膨润土（CGSB）防渗墙是截流高侵蚀性地下水的有效屏障。土工膜（GM）接缝在安装过程中不可避免地会出现缺陷，从而产生优先流道。设计了一种测量CGSB壁面接缝缺陷流速Q的实验装置。通过实验和数值模拟研究了CGSB墙体的泄漏特性。结果表明：土-膨润土（SB）在压力下进入节理，具有类似于亲水性垫片的密封作用，有效降低了Q值，随着水头hw的增大，节理内部间隙宽度增大，导致Q值显著增大，当hw从1 m增大到2 m时，测得Q值的最大增幅超过17.6倍；与未填充SB的情况相比，填充SB的接头断裂孔径df减小了一个数量级。当df < 0.1 mm时，CGSB墙体渗漏主要受df控制；当df > 0.2 mm时，泄漏量主要受GM - SB界面透过率的影响。

{"title":"Leakage of composite cutoff walls through geomembrane joint defects","authors":"Lin-Feng Cao, Yu-Chao Li, Bo Huang","doi":"10.1016/j.geotexmem.2025.04.002","DOIUrl":"10.1016/j.geotexmem.2025.04.002","url":null,"abstract":"<div><div>Composite geomembrane-soil-bentonite (CGSB) cutoff walls are effective barriers to contain highly aggressive contaminated groundwater. Defects in the geomembrane (GM) joint are inevitable during the installation, inducing preferential flow paths. An experimental device is designed to measure the flow rate <span><math><mrow><mi>Q</mi></mrow></math></span> through the joint defects of CGSB walls. Experiments and numerical simulations are performed to investigate the leakage characteristics of CGSB walls. The results show that soil-bentonite (SB) enters the joint under pressure and has a sealing effect similar to a hydrophilic gasket, which effectively reduces the <span><math><mrow><mi>Q</mi></mrow></math></span>. As the hydraulic head <span><math><mrow><msub><mi>h</mi><mi>w</mi></msub></mrow></math></span> increases, the internal gap width of the joint increases, resulting in a significant increase in <span><math><mrow><mi>Q</mi></mrow></math></span>. When <span><math><mrow><msub><mi>h</mi><mi>w</mi></msub></mrow></math></span> increases from 1 to 2 m, the maximum increase in the measured <span><math><mrow><mi>Q</mi></mrow></math></span> exceeds 17.6 times. The fracture pore diameter <span><math><mrow><msub><mi>d</mi><mi>f</mi></msub></mrow></math></span> of the joint filled with SB decreases by an order of magnitude compared to the case without SB filling. When <span><math><mrow><msub><mi>d</mi><mi>f</mi></msub></mrow></math></span> is less than 0.1 mm, the leakage of the CGSB wall is mainly controlled by <span><math><mrow><msub><mi>d</mi><mi>f</mi></msub></mrow></math></span>; while <span><math><mrow><msub><mi>d</mi><mi>f</mi></msub></mrow></math></span> is greater than 0.2 mm, the leakage is mainly affected by the interface transmissivity between the GM and SB.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 5","pages":"Pages 1063-1075"},"PeriodicalIF":4.7,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143886646","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

Tensile failure mechanism and stress-strain behavior of scratched HDPE geomembranes 刮伤HDPE土工膜拉伸破坏机理及应力-应变行为

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-04-17 DOI: 10.1016/j.geotexmem.2025.04.001

Jianmin Li, Junrui Chai, Zengguang Xu, Cheng Cao, Pengyuan Zhang, Han Fu

In the application of geomembranes (GMBs) for anti-seepage purposes, damage and defects are almost inevitable and can lead to premature failure during their service life. This study conducted a series of indoor tensile tests on defective GMBs to evaluate the effects of various defect types, locations, and geometric characteristics on their failure behavior. The results were validated through orthogonal tests to determine the influence of defect quantity and combination patterns on GMB performance. Furthermore, the performance at different stages was assessed under the condition of varying scratch geometric characteristics. The findings indicate that scratches pose a greater threat to GMB performance compared to other defect types. At the same angle, variations in scratch position have a negligible effect on mechanical properties. Among scratch geometric characteristics, length and angle are the primary factors affecting performance. For practical engineering applications, the allowable tensile stress range for scratched GMBs should be maintained between 2.97 and 3.50 MPa, while the allowable tensile strain range should be confined to 1.78–3.30 %. The evaluation and prediction of each stage of scratched GMBs can provide references for design engineers and the repair of scratched GMBs.

在土工膜防渗应用中，损坏和缺陷几乎是不可避免的，并可能导致其在使用寿命期间过早失效。本研究对有缺陷的gmb进行了一系列室内拉伸试验，以评估各种缺陷类型、位置和几何特征对其破坏行为的影响。通过正交试验验证了缺陷数量和组合方式对GMB性能的影响。在不同划痕几何特征条件下，对不同阶段的划痕性能进行了评价。研究结果表明，与其他缺陷类型相比，划痕对GMB性能的威胁更大。在相同角度下，划痕位置的变化对机械性能的影响可以忽略不计。在划痕的几何特征中，长度和角度是影响划痕性能的主要因素。实际工程应用中，划伤gmb的许用拉应力范围应保持在2.97 ~ 3.50 MPa之间，许用拉应变范围应控制在1.78 ~ 3.30%之间。通过对划伤的gmb各阶段的评估和预测，为设计工程师和gmb的划伤修复提供参考。

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引用次数: 0

Ensemble-based approach for automatic prediction of pullout resistance of geogrids in different soil types 基于集成的不同土工格栅抗拔力自动预测方法

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-04-14 DOI: 10.1016/j.geotexmem.2025.03.004

Vaishnavi Bherde , Samay Kumar Attara , Umashankar Balunaini

Determination of the pullout resistance of geogrid, an essential parameter in MSE wall design, is time-consuming and expensive. The present study applies ensemble methods, namely, random forest, gradient boosting, extreme gradient boosting (XGB), and light gradient boosting to predict the pullout resistance factor (F∗) of geogrid. An extensive review resulting in a large pullout test dataset of 759 data points encompassing various influencing features such as normal stress, relative compaction, fines content, average particle size of fill material, embedment length, ultimate tensile strength, and longitudinal and transverse spacing of ribs of the geogrid, and pullout displacement rate is used to evaluate models. Results showed that the XGB (R² = 0.91 and RMSE = 0.18) outperformed the other ensemble approaches. Based on the feature importance analysis on the best-performing XGB model, normal stress, reinforcement embedment length, and relative compaction are found to be the most influencing parameters affecting F∗. A simplistic model to predict F∗ as a function of only these three influencing parameters is proposed considering the ensemble model. Furthermore, limited laboratory pullout experiments are performed to evaluate these models. The proposed machine learning models fitted very well with the laboratory F∗ values with an error within ±3 %.

土工格栅拉拔阻力的测定是MSE墙体设计的重要参数，其计算耗时长，成本高。本研究采用随机森林、梯度增强、极端梯度增强（XGB）和光梯度增强的集合方法来预测土工格栅的拉拔阻力因子（F∗）。通过对759个数点的大型拉拔测试数据集的广泛审查，包括各种影响特征，如正应力、相对压实度、细粒含量、填充材料的平均粒径、嵌入长度、极限抗拉强度、土工格栅肋的纵向和横向间距，以及拉拔位移率，用于评估模型。结果表明，XGB （R2 = 0.91, RMSE = 0.18）优于其他集成方法。通过对最佳XGB模型的特征重要性分析，发现正应力、钢筋埋置长度和相对压实度是影响F * *的最大参数。一个简单的模型来预测F *作为一个函数，只有这三个影响参数被提出考虑集成模型。此外，有限的实验室拔出实验进行了评估这些模型。所提出的机器学习模型与实验室F *值拟合得非常好，误差在±3%以内。

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引用次数: 0

Development and application of a nonlinear stress dilatancy model for geocell-reinforced soil via the FEM 基于有限元的土工格室加筋土非线性应力剪胀模型的建立与应用

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-04-09 DOI: 10.1016/j.geotexmem.2025.03.010

Bingbing Zhang , Fei Song , Junding Liu

To address the ambiguities in current ontological models of geocell-reinforced soil and the limitations inherent in finite element analysis methods, a nonlinear stress dilatancy model (NSDM) encompassing geocell-reinforced soil was successfully formulated. This model is based on the interaction between the geocell and the infilled soil, which can consider the confining pressures provided by the geocells and the stress dilatancy model of the soil. A finite element method (FEM) implementation of the model was achieved via the User-defined Material (UMAT) subroutine interface provided by ABAQUS software. Validation of the model was achieved via triaxial tests on geocell-reinforced sand with varying relative densities, as well as reinforced foundation and retaining wall model tests. Concurrently, the model calculation results were compared and analyzed with those obtained from a conventional separated model, and an in-depth exploration of the sensitivity of the model's key parameters was carried out. The findings demonstrate that the UMAT subroutine of the model can accurately predict the reinforced sand triaxial test, the reinforced foundation model test and the retaining wall model test results. Compared with the reinforced soil-separated model, the model delineated in this paper is easier to construct and has markedly improved computational efficiency. Additionally, the model can capture failure within the geocell fill, thereby affording a more precise depiction in the near-failure stage. This research offers an efficient and practical novel methodology for numerical analysis within the domain of geocell-reinforced soil.

针对目前土工格室加筋土本体模型的模糊性和有限元分析方法的局限性，建立了包含土工格室加筋土的非线性应力剪胀模型（NSDM）。该模型建立在土工格室与填土相互作用的基础上，考虑了土工格室提供的围压和土的应力剪胀模型。通过ABAQUS软件提供的用户自定义材料（UMAT）子程序接口实现了模型的有限元法实现。通过不同相对密度土工格室加筋土的三轴试验，以及加筋土基础和挡土墙模型试验，验证了该模型的有效性。同时，将模型计算结果与常规分离模型计算结果进行了对比分析，并对模型关键参数的敏感性进行了深入探讨。结果表明，该模型的UMAT子程序能较准确地预测加筋砂三轴试验、加筋地基模型试验和挡土墙模型试验结果。与分筋模型相比，本文所建立的模型更易于构建，计算效率显著提高。此外，该模型可以捕获土工格室填充中的失效，从而在接近失效阶段提供更精确的描述。本研究为土工格室加筋土的数值分析提供了一种高效实用的新方法。

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引用次数: 0

Prediction method for lateral deformation of PVD-improved ground under vacuum preloading 真空预压下pvd加固地基侧向变形预测方法

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-04-05 DOI: 10.1016/j.geotexmem.2025.03.008

Fang Xu , Junfang Yang , Qichang Wu , Qi Yang , Yitian Lu , Wenqian Hao

A series of finite element analyses, conducted on the basis of modified triaxial tests incorporating radial drainage, were carried out to investigate the lateral deformation and stress state characteristics of prefabricated vertical drain (PVD) unit cells under vacuum preloading. The analyses revealed that the inward horizontal strain of the unit cell increases approximately linearly with the vacuum pressure (P_v) but decreases non-linearly with an increase in the initial vertical effective stress (σ′_v0). The variations in the effective stress ratio, corresponding to the median excess pore water pressure during vacuum preloading of the PVD unit cell, were elucidated in relation to the P_v and σ′_v0 using the simulation data. Relationships were established between the normalized horizontal strain and normalized effective stress ratio, as well as between the normalized stress ratio and a composite index parameter that quantitatively captures the effects of vacuum pressure, initial effective stress, and subsoil consolidation characteristics. These relationships facilitate the prediction of lateral deformation in PVD-improved grounds subjected to vacuum preloading, utilizing fundamental preloading conditions and soil properties. Finally, the proposed methodology was applied to analyze two field case histories, and its validity was confirmed by the close correspondence between the predicted and measured lateral deformation.

在径向排水改进三轴试验的基础上，开展了一系列有限元分析，研究了真空预压下预制垂直排水（PVD）单元格的侧向变形和应力状态特征。结果表明，随着真空压力（Pv）的增大，单晶胞内水平应变近似线性增加，而随着初始垂直有效应力（σ ' v0）的增大，单晶胞内水平应变呈非线性减小。利用模拟数据分析了真空预压过程中有效应力比（即超孔隙水压力中值）与Pv和σ ' v0的关系。建立归一化水平应变与归一化有效应力比之间的关系，以及归一化应力比与定量捕捉真空压力、初始有效应力和地基固结特征影响的复合指标参数之间的关系。利用基本的预压条件和土壤特性，这些关系有助于预测真空预压下pvd改良地基的侧向变形。最后，将该方法应用于两个现场实例的分析，结果表明，该方法的有效性得到了验证。

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引用次数: 0