基于强度折减法的水井包滑坡稳定性评价研究

发布时间：2019-02-24 12:58

【摘要】：作为全球性三大地质灾害之一的边坡失稳严重危及到国家财产和人们的安全。而滑坡的发生和发展是一个累进、渐变的破坏过程。因此,基于强度折减法和数值分析软件,对滑坡的稳定性进行研究,有很重要的工程价值和社会意义。本文分别以简易均质滑坡和水井包滑坡为背景,运用CAD三维软件、ANSYS、Excel、FLAC3D、lstop和其他软件对边坡进行三维建模、数值分析和安全预警,并形成一种流程可以运用在实际滑坡中,并得出如下结论:1)通过对水井包滑坡定性和定量分析,通过工程地质勘查,对滑坡的边界、规模、形态特征、岩土体的结构特征及近期变形特征进行初步分析,之后通过数值模拟软件对滑坡的稳定性进行计算,可以达到既定预期目的和现场实际需求。2)通过稳定性宏观分析和稳定性计算分析,水井包滑坡在天然工况下整体处于稳定状态,暴雨工况下滑坡处于欠稳定状态,该滑坡可能发生失稳下滑,沿滑坡前缘边坡坡脚处剪出。确定该滑坡目前变形特征明显,主要表现为滑动引起的房屋变形和地表开裂,目前处于强变形阶段。3)由于强度折减法不必假设土条间的作用力和破坏面的位置和形状,且能够直接得到水井包滑坡安全系数和滑面,因此,该法能处理复杂几何轮廓和边界条件,有着广泛的适用性和良好的应用前景。
[Abstract]:As one of the three major geological disasters in the world, slope instability seriously endangers the national property and people's safety. The occurrence and development of landslide is a progressive and gradual process of failure. Therefore, it is of great engineering value and social significance to study the stability of landslide based on strength reduction method and numerical analysis software. In this paper, based on simple homogeneous landslide and Shuibao landslide, the 3D modeling, numerical analysis and safety early warning of slope are carried out by using CAD, ANSYS,Excel,FLAC3D,lstop and other software, respectively. And form a process that can be used in the actual landslide, and draw the following conclusions: 1) through the qualitative and quantitative analysis of the landslide, through the engineering geological exploration, the landslide boundary, scale, morphological characteristics, The structural characteristics and recent deformation characteristics of rock and soil are analyzed preliminarily, and then the stability of landslide is calculated by numerical simulation software. Through macroscopic analysis of stability and calculation and analysis of stability, the landslide of water well package is in a stable state under natural conditions, and the landslide is in a state of unstability under heavy rain. The landslide may be unstable and slid and cut out along the foot of the slope along the front edge of the landslide. It is determined that the deformation characteristics of the landslide are obvious at present, mainly manifested in the deformation of buildings and surface cracks caused by sliding, and are at the stage of strong deformation at present. (3) since the strength reduction method does not have to assume the position and shape of the soil force and the failure surface, The safety factor and the sliding surface of the landslide can be obtained directly. Therefore, this method can deal with complex geometric contours and boundary conditions, and has wide applicability and good application prospect.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.22

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