地震作用下考虑拉—剪强度的边坡稳定性分析

发布时间：2018-05-05 20:57

本文选题：地震 + 边坡稳定性　；参考：《北京交通大学》2017年硕士论文

【摘要】：地震作用在西南地区引起的大量的山体滑坡,对自然环境造成极大破坏,给居民生活带来了巨大的潜在危险。根据地震后对大量山体滑坡的实地勘察发现,在地震作用下大量坡顶区域土体处于拉剪受力状态,并且土体基本处于非饱和状态,这对地震作用下的边坡稳定性有很大的影响。本文针对上述情况,在前人的基础上主要完成了以下工作:1.由于经典Mohr-Coulomb强度准则由于过高估计拉剪强度,本文采用修正的Mohr-Coulomb强度准则分析边坡的稳定性。该准则修正了拉剪区域,考虑拉剪联合作用,更加准确合理地描述土的压剪强度、张拉-剪切耦合强度及多向拉伸强度特征。ABAQUS自带Mohr-Coulomb强度准则没有考虑土体的拉剪强度并且是建立在经典Mohr-Coulomb强度准则的基础上,所以根据需要自己开发用户材料子程序UMAT来分析。2.在自重作用下,建立了是否考虑拉剪强度和非饱和强度的四种工况,对比分析了拉剪强度和非饱和特性对边坡稳定性的影响。3.在地震作用下,基于粘弹性边界理论,为边坡稳定性分析提供精确的人工边界,使用修正Mohr-Coulomb准则和非饱和土的强度参数,来分析边坡的动力响应以及在不同坡角和不同入射角度下P波或SV波对边坡的稳定性影响。
[Abstract]:A large number of landslides caused by earthquake in the southwest region caused great damage to the natural environment and brought great potential danger to the lives of the residents. According to the field investigation of a large number of landslides after the earthquake, a large number of slopes in the top slope area were in the state of tensile shear stress under the earthquake action, and the soil was basically in the unsaturated form. In this paper, the following work has been done on the basis of the forefathers: 1. because of the high estimation of the tensile shear strength of the classical Mohr-Coulomb strength criterion, the modified Mohr-Coulomb strength is used to analyze the stability of the slope. Region, considering the joint action of shear and shear, the compressive shear strength of soil is described more accurately, the tensile shear coupling strength and the characteristics of multi direction tensile strength.ABAQUS self carrying Mohr-Coulomb strength criterion do not consider the tensile shear strength of the soil and are based on the classical Mohr-Coulomb strength criterion, so the user is developed according to the needs of the user. The material subroutine UMAT is used to analyze the four conditions of.2. under the action of self weight, whether the tensile shear strength and the unsaturated strength are considered, and the effects of the tensile shear strength and the unsaturated characteristics on the stability of the slope are compared and analyzed. Under the action of the earthquake,.3. is based on the viscoelastic boundary theory, which provides a precise artificial boundary for the slope stability analysis. The Mohr-Coulomb criterion and the strength parameters of unsaturated soil are modified to analyze the dynamic response of the slope and the effect of P wave or SV wave on the stability of the slope at different angle of slope and different angle of incidence.

【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU43

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