斜坡倾倒变形的工程地质分析

发布时间：2018-05-18 23:40

本文选题：坠覆 + 稳定性　；参考：《工程地质学报》2017年05期

【摘要】：近10年来,在山区,尤其是西部山区的工程建设和灾害防治实践中,我们发现越来越多的以"倾倒"为特征的岩质边坡变形破坏和稳定性问题,其出现的频度和造成的危害大有比肩"滑动"破坏这一边坡失稳的传统主题,成为困扰地质工程师和岩石力学工作者的又一难题。这类问题之所以难,是因为建立在以"滑动"为基础的传统边坡稳定性分析方法不再适用这类边坡。本文在大量工程实例的基础上,分析了边坡倾倒变形和破坏的基本特征,从"倾倒"变形破坏的地质过程和变形稳定性分析的基本理念出发,建立了描述倾倒边坡不同变形程度的工程地质模型,这个模型将倾倒边坡分为倾倒-坠覆、倾倒-错动、倾倒-张裂、倾倒-松弛4个区,分别对应不同的变形程度和稳定性状况,提出了各个区的具体特征和定性指标与量化指标相结合的描述指标体系,从而将倾倒的地质显现、力学机理和变形稳定性有机统一,实现了对倾倒边坡稳定性的工程地质评价。与传统的"滑动"问题不同的是,本文没有强调对这类问题采用强度稳定性的评价思路,而建议采用变形稳定性评价的理念,这似乎更适合倾倒变形这类问题的分析和评价。
[Abstract]:In the past 10 years, in the engineering construction and disaster prevention and control practice in mountainous areas, especially in the western mountainous areas, we have found more and more problems of the deformation and failure and stability of rock slope characterized by "dumping". The frequency and the harm caused by it have a great influence on the traditional theme of "sliding" that undermines the slope instability. It has become a geological engineer. This kind of problem is difficult, because the traditional slope stability analysis method based on "sliding" is no longer applicable to this kind of slope. Based on a large number of engineering examples, this paper analyses the basic characteristics of slope toppling deformation and failure, and the geological process of "dumping" deformation and destruction. Based on the basic idea of the analysis of deformation and stability, an engineering geological model is established to describe the different deformation degree of the dumping slope. This model divides the dumping slope into 4 areas, which are toppling - falling, dumping - dislocation, dumping - tensioned and toppling - relaxation, corresponding to different degree of deformation and stability, and the specific characteristics and determination of each area are put forward. It is different from the traditional "sliding" problem that the evaluation idea of the strength stability of this kind of problem is not emphasized. The idea of deformation stability evaluation is more suitable for analysis and evaluation of such problems as dumping deformation.
【作者单位】：地质灾害防治与地质环境保护国家重点实验室(成都理工大学);
【基金】：国家自然科学基金重点项目(41130745) 国家973项目(2013CB733202)资助
【分类号】：P642.2

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