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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Dynamic properties and liquefaction behaviour of granular materials using discrete element method.
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Dynamic properties and liquefaction behaviour of granular materials using discrete element method.

机译：颗粒材料的动态特性和液化行为的离散元法。

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摘要

Dynamic properties of the soil such as shear modulus and damping ratio are important parameters in the prediction of the dynamic response of geotechnical engineering structures. Though these properties are dependent on several factors, strain amplitude and confining pressure have a major effect. Liquefaction is another important phenomenon associated with the undrained response of granular materials in loose state. This paper presents the results of the numerical simulation of cyclic triaxial shear tests on three-dimensional assembly consisting of 1000 sphere particles using Discrete Element Method (DEM) under undrained conditions. Parameters such as shear modulus, damping, strain amplitudes, confining pressure, and number of cycles required for liquefaction, were considered. Results show that the shear modulus and damping ratio were estimated for a range of shear strain and confining pressure. The DEM simulations have modelled the liquefaction behaviour under undrained conditions very close to the real experimental behaviour. There is a reduction in shear modulus and an increase in damping at large shear strain levels. Assemblies under initial loose conditions liquefy rapidly with increase in strain amplitude. At low confining pressure, the assembly liquefies rapidly; however, with an increase in confining pressure, there is an increase in liquefaction resistance that requires a several-fold increase of confining pressure to eliminate the risk of liquefaction.
机译：土壤的动态特性，例如剪切模量和阻尼比，是预测岩土工程结构动力响应的重要参数。尽管这些特性取决于几个因素，但是应变幅度和围压具有重大影响。液化是与松散状态下的颗粒状材料的不排水响应相关的另一个重要现象。本文介绍了在不排水条件下使用离散元方法（DEM）对由1000个球体组成的三维装配体进行循环三轴剪切试验的数值模拟结果。考虑了诸如剪切模量，阻尼，应变幅度，围压和液化所需的循环数等参数。结果表明，在一定的剪切应变和围压范围内，估计了剪切模量和阻尼比。 DEM仿真已经模拟了在不排水条件下非常接近实际实验行为的液化行为。在较大的剪切应变水平下，剪切模量降低，阻尼增加。初始松弛条件下的组件会随着应变幅度的增加而迅速液化。在低围压下，组件迅速液化;然而，随着围压的增加，抗液化性的增加要求围压的几倍增加以消除液化的风险。

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