成都地区非饱和膨胀土边坡稳定性的有限元分析

发布时间：2018-06-20 13:43

本文选题：降雨入渗 + 非饱和膨胀土　；参考：《西南石油大学》2015年硕士论文

【摘要】：膨胀土作为一种典型的非饱和粘土,工程性质较为复杂,成都地区分布着大面积的微膨胀土。降雨是诱发边坡失稳的主要因素之一,随着城市基础建设与商业建设的加快,雨季膨胀土边坡失稳的现象在成都地区时有发生。因此研究降雨入渗情况下,膨胀土边坡的失稳规律,对滑坡灾害的防治有着重要意义。本文在概述相关学术文献和动态的基础上通过室内试验与数值分析的方法,对成都地区膨胀土边坡的稳定性进行了较为系统的研究,主要内容如下： 1.根据膨胀土稳定性研究的学术文献和动态,基于非饱和土强度理论和双强度折减法理论,以ABAQUS软件为平台,制定出针对成都地区微膨胀土边坡稳定性的有限元计算分析方法。 2.通过土水特征曲线试验得到基质吸力与饱和度的关系,根据原状土浸水试验和干湿循环下的直剪试验确定膨胀土的抗剪强度。 3.以ABAQUS软件为平台,分析了降雨作用对膨胀土边坡稳定性的影响。得到了不同降雨作用对稳定性的影响；孔隙水压力和饱和度随着降雨持续时间的变化规律；降雨持续时间各阶段微膨胀土边坡的稳定性折减系数。 4.根据工程原型建立三维模型,进行数值模拟计算,分析不同支护方式对边坡稳定性的影响。本文根据计算结果所发现的变化规律,可为成都地区微膨胀土的滑坡灾害治理提供依据,具有一定的理论意义和实用价值。
[Abstract]:As a typical unsaturated clay, expansive soil has complex engineering properties, and a large area of micro-expansive soil is distributed in Chengdu area. Rainfall is one of the main factors inducing slope instability. With the acceleration of urban infrastructure and commercial construction, slope instability of expansive soil in rainy season occurs frequently in Chengdu area. Therefore, it is of great significance to study the instability law of expansive soil slope under rainfall infiltration. In this paper, the stability of expansive soil slope in Chengdu is studied systematically by means of laboratory test and numerical analysis on the basis of summarizing relevant academic documents and dynamics. The main contents are as follows: 1. Based on the theory of unsaturated soil strength and the theory of double strength reduction, Abaqus software is used as the platform. A finite element analysis method for the stability of small expansive soil slope in Chengdu area is developed. 2. The relationship between matrix suction and saturation was obtained by soil-water characteristic curve test. The shear strength of expansive soil was determined by soaking test of undisturbed soil and direct shear test under dry and wet cycle. Based on Abaqus software, the effect of rainfall on slope stability of expansive soil is analyzed. The influence of different rainfall on the stability, the variation of pore water pressure and saturation with rainfall duration, the coefficient of stability reduction of small expansive soil slope in each stage of rainfall duration, and the variation of pore water pressure and saturation with rainfall duration are obtained. 4. According to the engineering prototype, the 3D model was built, and the numerical simulation was carried out to analyze the influence of different supporting methods on the slope stability. Based on the results of the calculation, this paper can provide the basis for the landslide disaster management of the micro-expansive soil in Chengdu area, which has certain theoretical significance and practical value.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.22

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