Geotextiles and Geomembranes最新文献_第9页

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 : 2025-08-01 Epub 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

Connection failure between reinforcement and facing in geosynthetic reinforced soil bridge abutments: A case study 土工合成加筋土桥台配筋与桥面连接失效案例研究

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-08-01 Epub Date: 2025-03-30 DOI: 10.1016/j.geotexmem.2025.03.009

Qiangqiang Huang , Xueyu Geng , Feifan Ren

Geosynthetic-reinforced soil (GRS) bridge abutments are increasingly used in transportation engineering. However, limited research has been conducted on the failure mechanisms of GRS bridge abutments, particularly the connection failures between reinforcement and facing. In this study, large-scale model tests were carried out to investigate the impact of connection failure between reinforcement and facing on the overall stability of GRS bridge abutments. The tests focused on a weaker connection configuration using low-strength cable ties subjected to high vertical loads. Photographic analysis was employed to document deformation and failure processes, while additional data were collected via sensors to monitor settlement, lateral displacement, and strain behavior during loading. The results indicated that inadequate connections between reinforcement and facing could result in progressive deformation, panel detachment, backfill leakage, and collapse under high loads. These findings underscore the importance of a strong connection between reinforcement and facing for maintaining structural stability. To address these issues, improved measures were proposed and validated, demonstrating significant enhancements in load-bearing performance and resilience.

土工合成材料加固土（GRS）桥墩在交通工程中的应用越来越广泛。然而，有关土工合成材料加固桥台失效机理的研究，尤其是加固层与面层之间的连接失效的研究还很有限。在本研究中，我们进行了大规模的模型试验，以研究钢筋和面层之间的连接失效对 GRS 桥墩整体稳定性的影响。测试主要针对在高垂直荷载下使用低强度拉索的较弱连接结构。采用照片分析记录变形和失效过程，同时通过传感器收集其他数据，以监测加载期间的沉降、横向位移和应变行为。结果表明，在高荷载作用下，钢筋和面层之间的连接不足会导致渐进变形、面板脱落、回填渗漏和坍塌。这些发现强调了钢筋和面层之间牢固连接对于保持结构稳定性的重要性。为解决这些问题，我们提出了改进措施并进行了验证，结果表明这些措施显著提高了承重性能和回弹性。

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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 : 2025-08-01 Epub 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

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 : 2025-08-01 Epub 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

Study on the dynamic performance of heavy-load railway reinforced subgrade under flood condition 洪水条件下重载铁路加筋路基动力性能研究

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-08-01 Epub Date: 2025-03-30 DOI: 10.1016/j.geotexmem.2025.03.005

Lihua Li, Kai Sun, Mengqian Xu, Henglin Xiao, Shuguang Jiang

To mitigate the subgrade deterioration induced by water infiltration, geosynthetics are employed to reinforce overloaded railway subgrades. Indoor model experiments were conducted to simulate dynamic loads under different axle weights, investigating the impacts of immersion on the dynamic characteristics of reinforced subgrades. Results demonstrated that immersion significantly increased the subgrade's stress, settlement, and acceleration. Compared to submerged unreinforced subgrades after immersion, the geocell-reinforced subgrade exhibited a 33 % reduction in additional stress, while the composite-reinforced subgrade, comprising geocell and geotextile, exhibited a 35 % decrease. The geotextile was placed beneath the ballast layer, with the geocell positioned below the geotextile. Additionally, settlement at the middle sleeper was reduced by 29 % for the geocell-reinforced subgrade under 30 t load and 38 % for the composite-reinforced subgrade, demonstrating that reinforcement enhanced subgrade strength, stabilized the upper structure, and mitigated subgrade acceleration. After immersion, geotextiles play a crucial role in maintaining the integrity of the ballast layer and minimizing ballast contamination. A modified model for the additional stress distribution within the ballast layer has been proposed, whereby the additional stress at any point outside the projected surface of the ballast layer can be calculated based on the distances from both the side and front of the sleeper.

为减轻渗水对路基造成的劣化，采用土工合成材料对超载铁路路基进行加固。通过室内模型试验，模拟不同轴重下的动荷载，研究浸没对加筋路基动力特性的影响。结果表明，浸没显著增加了路基的应力、沉降和加速度。与淹没后的未加筋路基相比，土工格室加筋路基的附加应力降低了33%，而由土工格室和土工织物组成的复合加筋路基的附加应力降低了35%。土工织物放置在压舱物层下方，土工室位于土工织物下方。此外，土工格室加筋地基在30 t荷载下，中间轨枕处的沉降减少了29%，复合加筋地基减少了38%，表明加筋增强了路基强度，稳定了上部结构，减轻了路基加速度。浸没后的土工布在保持道砟层的完整性和减少道砟污染方面起着至关重要的作用。本文提出了一种修正的碴层内附加应力分布模型，根据距轨枕侧面和正面的距离，可以计算出碴层投影面外任意点的附加应力。

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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 : 2025-08-01 Epub 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

Influence of rainfall and drying periods on the performance of a large-scale segmental GRS wall model built with poorly draining local soil 降雨和干燥期对局部排水差的大尺度分段式GRS墙体模型性能的影响

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-08-01 Epub Date: 2025-03-09 DOI: 10.1016/j.geotexmem.2025.02.003

M.C. Santos , Yoo C , F.H.M. Portelinha

The use of poorly draining local soils as backfill material in geosynthetic reinforced soil walls has become a common practice despite the known risks. With climate change effects, it is crucial to understand how these structures will perform under such extreme conditions. In this study, the performance of a large-scale model of a modular block geogrid-reinforced soil wall, using fine-grained backfill material, is evaluated under varying simulated rainfall intensities and drying periods. The model was constructed in a laboratory environment, enabling the implementation of an extensive instrumentation program designed to monitor soil suction, volumetric water content, and the resulting deformation and reinforcement strains. Tensile loads mobilized by the geogrid within the backfill soil and at the connection with block wall facing are discussed in the paper. The study demonstrates the satisfactory performance of a poorly draining reinforced soil wall even after prolonged and intense simulated rainfall. The low hydraulic conductivity of the well-compacted backfill soil, combined with significant surface runoff, helped maintain low levels of soil suction which reflects in apparent cohesion. Drying periods led to varying but significant rates of suction recovery influenced by rainfall-drying patterns. The findings indicate that rainfall intensities of 10 mm/h (240 mm/day) for over 7 days were insufficient to fully eliminate suction in a poorly draining geogrid-reinforced wall.

使用排水差的当地土壤作为土工合成加筋土墙的回填材料已经成为一种常见的做法，尽管已知的风险。由于气候变化的影响，了解这些结构在这种极端条件下的表现是至关重要的。在这项研究中，采用细粒回填材料的模块化块格土工格栅加筋土墙的大尺度模型在不同的模拟降雨强度和干燥时间下的性能进行了评估。该模型是在实验室环境中构建的，可以实施广泛的仪器程序，用于监测土壤吸力、体积含水量以及由此产生的变形和加固应变。本文讨论了土工格栅在回填土内及与砌块墙接头处所调动的拉伸荷载。研究表明，在长时间的强模拟降雨作用下，疏水性较差的加筋土墙仍具有良好的性能。压实良好的回填土的低水力导率，加上大量的地表径流，有助于保持较低的土壤吸力水平，这反映在表观粘聚性上。干燥期导致受降雨干燥模式影响的吸力恢复速率变化但显著。研究结果表明，持续7天以上的10毫米/小时（240毫米/天）降雨强度不足以完全消除排水差的土工格栅加筋墙的吸力。

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引用次数: 0

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 : 2025-08-01 Epub 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

The effect of a bench on leakage through a cover: A field and numerical assessment 台架对盖层渗漏的影响：现场与数值评估

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-08-01 Epub Date: 2025-03-15 DOI: 10.1016/j.geotexmem.2025.02.005

Y.H. Fan , R. Kerry Rowe , R.W.I. Brachman , Jamie F. VanGulck

Field experiments are conducted to quantify the leakage through an 11-mm-diameter hole in the liner on slopes with and without a bench under waste cover conditions. Over 14 months, with a total precipitation of 947 mm, a 0.68 m bench on a 4H: 1V slope results in a 43-fold increase in leakage (from 6.5 L to 282 L) compared to the reference section without a bench. Substantial leakage is attributed to snowmelt occurring at low temperatures. 3D numerical modelling is conducted and shows good agreement with the measured leakage induced by both rainfall and snowmelt. Parametric studies are conducted to further analyze the impact of hole locations, slope length, and slope gradient on leakage. The validated numerical model is used to predict potential leakage in a real case scenario, which features benches formed by differential settlement observed after 3-year service as a landfill cover. This paper contributes to enhancing leakage prediction so as to optimize the design of slope and bench configurations in waste covers.

通过现场试验，量化了垃圾覆盖条件下，在有垫层和没有垫层的斜坡上，衬里直径11 mm孔的泄漏量。在14个月的时间里，总降水量为947毫米，在4H: 1V的斜坡上，0.68米的工作台与没有工作台的参考区域相比，漏水量增加了43倍（从6.5升增加到282升）。大量泄漏归因于低温下发生的融雪。三维数值模拟结果与实测的降水和融雪引起的渗漏量吻合较好。进行参数化研究，进一步分析孔位、坡长、坡坡度对渗漏的影响。验证的数值模型用于预测实际情况下的潜在泄漏，其特征是作为垃圾填埋场覆盖3年后观测到的差异沉降形成的长凳。本文有助于加强渗漏预测，从而优化垃圾填埋场坡面和台架配置的设计。

引用次数: 0

Consolidation of slurry treated by PHDs-VP incorporating development process of clogged zone 含堵塞区发展过程的ph - vp处理浆体固结

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-08-01 Epub Date: 2025-03-22 DOI: 10.1016/j.geotexmem.2025.03.003

Kang Yang , Mengmeng Lu , Kuo Li , Xiusong Shi

The prefabricated horizontal drains combined with vacuum preloading (PHDs-VP) method exhibits significant benefits in dredged slurry treatment. This study introduces an analytical model of slurry consolidation treated by PHDs-VP. In this model, the PHD is treated as a permeable boundary with a vacuum pressure. The governing equations are established by dividing the analytical unit into normal zone and clogged zone, and by incorporating the development process of the clogged zone. Numerical solutions are obtained utilizing the finite difference method. The accuracy and reliability of the solutions are validated through both degradation analysis and experimental verification. Furthermore, a parametrical analysis is conducted to investigate the influence of several key parameters on consolidation behavior. The results indicate that the clogging effect significantly retards the consolidation process, with a lower permeability coefficient or a greater thickness of the clogged zone resulting in a more pronounced reduction in the consolidation rate. Additionally, the consolidation rate decreases with the accelerated development of the clogged zone, and this effect becomes more pronounced with denser PHDs layout.

预制水平排水管结合真空预压（ph - vp）方法在疏浚泥浆处理中具有显著的效果。介绍了ph - vp处理浆体固结的分析模型。在该模型中，将PHD视为具有真空压力的可渗透边界。将分析单元划分为正常区和堵塞区，结合堵塞区的发展过程，建立了控制方程。利用有限差分法得到了数值解。通过退化分析和实验验证，验证了解的准确性和可靠性。此外，还进行了参数分析，探讨了几个关键参数对固结行为的影响。结果表明：堵塞效应显著延缓了固结过程，渗透系数越低或堵塞区厚度越大，固结速率降低越明显；此外，固结速率随着堵塞区发育的加快而降低，并且随着博士层的密集，这种影响更加明显。

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引用次数: 0