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首页> 外文会议>Pan-American conference on unsaturated soils >Modeling the Dynamic Response of a Level Ground Unsaturated Sand Deposit Using a Fully Coupled Finite Element Analysis Procedure
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Modeling the Dynamic Response of a Level Ground Unsaturated Sand Deposit Using a Fully Coupled Finite Element Analysis Procedure

机译：使用完全耦合的有限元分析程序建模水平接地不饱和砂沉积物的动态响应

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In earthquake prone areas, problems arise from dynamic loading of unsaturated soils. Recent devastating earthquakes in Japan have demonstrated the importance of understanding the seismic behavior of the geotechnical engineering structures found on unsaturated soils. In this paper, the behavior of a level ground deposit of an unsaturated sand subjected to earthquake loading is studied using a fully coupled flow-deformation finite element code with solid displacements, pore water pressure, and pore air pressure as nodal variables. A fully coupled hydro-mechanical elastoplastic constitutive model for unsaturated sands and silts, which includes a hysteretic model for soil water characteristic curves and the hydro-mechanical coupling, is utilized to describe the stress-strain behavior of the unsaturated sand. The simulation results show the occurrence of liquefaction up to a certain depth and the effects of liquefaction such as the damping of surface accelerations. The depth of liquefaction was found to decrease with a decrease in the degree of saturation.
机译：在地震俯卧区中，出现了不饱和土壤的动态载荷产生的问题。最近日本的毁灭性地震已经证明了了解不饱和土壤中发现的岩土工程结构的地震行为的重要性。在本文中，使用具有固体位移，孔隙水压力和孔隙空气压力的完全耦合的流量变形有限元码，研究了受地震载荷的不饱和砂水平接地沉积的行为。用于不饱和砂和淤泥的完全耦合的水力机械弹塑性本构型模型，包括用于土壤水特征曲线的滞后模型和水力 - 机械耦合，描述了不饱和砂的应力 - 应变行为。仿真结果表明，液化的发生至一定的深度，液化诸如表面加速的阻尼的影响。发现液化深度随着饱和程度的降低而降低。

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