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首页> 外文期刊>Canadian Geotechnical Journal >Three-dimensional numerical analysis of geocell-reinforced soft clay beds by considering the actual geometry of geocell pockets
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Three-dimensional numerical analysis of geocell-reinforced soft clay beds by considering the actual geometry of geocell pockets

机译：考虑土工格室实际几何形状的土工格室加固软黏土床三维数值分析

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Due to its complex honeycomb structure, the numerical modeling of the geocell has always been a big challenge. Generally, the equivalent composite approach is used to model the geocells. In the equivalent composite approach, the geocellsoil composite is treated as the soil layer with improved strength and stiffness values. Though this approach is very simple, it is unrealistic to model the geocells as the soil layer. This paper presents a more realistic approach of modeling the geocells in three-dimensional (3D) framework by considering the actual curvature of the geocell pocket. A square footing resting on geocell reinforced soft clay bed was modeled using the "fast Lagrangian analysis of continua in 3D" (FLAC(3D)) finite difference package. Three different material models, namely modified Cam-clay, Mohr-Coulomb, and linear elastic were used to simulate the behaviour of foundation soil, infill soil and the geocell, respectively. It was found that the geocells distribute the load laterally to the wider area below the footing as compared to the unreinforced case. More than 50% reduction in the stress was observed in the clay bed in the presence of geocells. In addition to geocells, two other cases, namely, only geogrid and geocell with additional basal geogrid cases were also simulated. The numerical model was systematically validated with the results of the physical model tests. Using the validated numerical model, parametric studies were conducted to evaluate the influence of various geocell properties on the performance of reinforced clay beds.
机译：由于蜂窝结构复杂，土工格室的数值建模一直是一个很大的挑战。通常，等效的复合方法用于对地理单元建模。在等效的复合方法中，土工土复合材料被视为具有改进的强度和刚度值的土层。尽管此方法非常简单，但是将土格单元建模为土壤层是不现实的。本文通过考虑土工格室的实际曲率，提出了一种在三维（3D）框架中对土工格建模的更现实的方法。使用“ 3D连续体的快速拉格朗日分析”（FLAC（3D））有限差分包对位于土工格室加固的软粘土床上的平方英尺进行建模。三种不同的材料模型，即改良的Cam-clay，Mohr-Coulomb和线性弹性分别用于模拟基础土，填充土和土工格室的行为。已发现，与未加固的情况相比，土工格室将载荷横向分布到基础以下的较宽区域。在存在土工格室的情况下，在粘土层中观察到应力降低了50％以上。除了土工格外，还模拟了另外两种情况，即仅土工格栅和具有附加基础土工格的土工格。数值模型已通过物理模型测试的结果得到系统验证。使用经过验证的数值模型，进行了参数研究，以评估各种土工格室性能对加筋粘土床层性能的影响。

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