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Analysis of Various Drained and Undrained Instability Modes in Medium Dense Sand Subjected to Biaxial Loading Conditions

机译：双轴荷载条件下中重砂不同排水失稳模式的分析

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摘要

The present study theoretically explores instability behavior of medium dense sand under both drained and undrained biaxial test. The instability analysis has been posed as a plane strain bifurcation problem within a large deformation framework. A generalized pressure-dependent 3D constitutive model has been employed to simulate the drained and undrained biaxial tests on a medium dense sand sample assuming two types of lateral boundaries, namely rigid and flexible. The lateral boundary condition can influence significantly the onset of undrained soild-fluid instability and drained diffused intabilities. Localization gets delayed with increasing lateral confinement for both drained and undrained cases. Elastic parameters have strong impact on the instability onset.
机译：本研究从理论上探讨了中密度砂在排水和不排水双轴试验下的失稳行为。不稳定性分析被认为是大变形框架内的平面应变分叉问题。假设两种横向边界，即刚性和柔性，均采用了广义的压力相关3D本构模型来模拟中密度砂样品的排水和不排水双轴试验。横向边界条件可以显着影响不排水的土流不稳定性和排水的扩散不稳定性的发生。对于排水和不排水的病例，随着侧向限制的增加，定位会延迟。弹性参数对不稳定性的开始有很大的影响。

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