山区高速公路顺层岩质边坡的稳定性评价与研究

发布时间：2018-01-15 23:28

本文关键词：山区高速公路顺层岩质边坡的稳定性评价与研究　出处：《武汉理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年，在我国西部、西南部一带的山区高速工程中，出现了不少顺层岩质边坡的失稳破坏事故，，尤其是在前期的路堑边坡开挖修筑，或是后期运营的持续强降雨期间，给人民的生命财产安全造成大量损失。因此，如何正确评价分析顺层岩质边坡的稳定性，已成为当今工程学科领域的研究热点。本文试从层状岩体结构特征出发，基于该类岩体的受力变形机制及水理特性，研究了开挖扰动和持续强降雨入渗对顺层岩质边坡稳定性的影响。以湖北省恩来高速公路中的典型边坡工点构建分析模型，采用极限平衡理论与数值模拟相结合的方法，对模型的稳定性进行了较为深入的分析与探讨。主要研究内容如下：（1）基于层状岩体的结构控制理论，通过对层状岩体的结构面形式、变形破坏机制的分析，以及顺层岩质边坡的几种主要破坏模型的研究，阐述了顺层岩质变边坡的变形破坏机理。（2）通过对层状岩体结构水理特性的分析，采用极限平衡理论，对顺层岩质边坡的稳定性进行评判与分析。结合山区高速公路工程特征，对层状岩体的雨水入渗效应进行了量化分析，对引其稳定性影响两大主要因素（开挖扰动与持续强降雨）及常用防治措施的作用机理予以分析和研究。（3）在对恩来高速全线边坡结构及地勘资料的整理分析后，结合工程地质结构与路线设计方案，建立了顺层岩质边坡典型工点分析模型。并依据现有地勘资料与相关工程规范，拟定岩层岩性参数。采用Flac3D数值模拟软件，对开挖过程的内部应力变形特征进行对比分析。修正顺层岩质边坡入渗各阶段物理力学参数，采用强度折减法，对其在不同阶段所表现出的极限稳定状态进行对比分析。顺层岩质边坡在受到开挖扰动或雨水入渗时，其内部软弱层面的对其结构稳定起到关键控制作用。
[Abstract]:In recent years, in the high speed project of mountainous area in the west and southwest of China, there have been many failure accidents of rock slope instability, especially in the early excavation and construction of cutting slope. Or during the period of continuous heavy rainfall, the safety of people's life and property will be greatly lost. Therefore, how to correctly evaluate and analyze the stability of bedding rock slope. It has become the research hotspot in the field of engineering. In this paper, based on the structural characteristics of layered rock mass, based on the mechanical deformation mechanism and hydrological characteristics of this kind of rock mass. The influence of excavation disturbance and continuous heavy rainfall infiltration on the stability of bedding rock slope is studied. The stability of the model is analyzed and discussed with the combination of limit equilibrium theory and numerical simulation. The main contents are as follows: Based on the structure control theory of layered rock mass, through the analysis of structural plane form, deformation and failure mechanism of layered rock mass and several main failure models of bedding rock slope. The deformation and failure mechanism of bedding rock slope is expounded. 2) through the analysis of the hydraulic characteristics of layered rock mass structure and the limit equilibrium theory, the stability of the bedding rock slope is evaluated and analyzed, combining with the engineering characteristics of highway in mountainous area. In this paper, the Rain Water infiltration effect of layered rock mass is quantitatively analyzed. The two main factors (excavation disturbance and continuous heavy rainfall) and the mechanism of common prevention measures are analyzed and studied. (3) after analyzing the slope structure and geological prospecting data of Enlai high speed highway, combined with engineering geological structure and route design scheme. The typical work point analysis model of bedding rock slope is established. According to the existing geological prospecting data and relevant engineering specifications, lithologic parameters of the strata are drawn up. Flac3D numerical simulation software is used. The characteristics of internal stress and deformation during excavation are compared and analyzed. The strength reduction method is adopted to modify the physical and mechanical parameters of bedding rock slope in each stage of infiltration. The limit stability of the rock slope in different stages is compared and analyzed. When the rock slope is disturbed by excavation or infiltrated by Rain Water, the internal weak layer plays a key role in controlling the stability of its structure.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.14

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