受扰古滑坡体复活机制及稳定性研究

发布时间：2018-05-01 11:05

本文选题：古滑坡复活 + 成因分析　；参考：《西华大学》2017年硕士论文

【摘要】：人类工程活动不可避免会遇到古滑坡体复活引起新滑坡问题。研究此类古滑坡体复活的基本特征及形成原因,正确评价其稳定性,对预防滑坡复活尤为重要。本文以汉源新县城T8地块后缘滑坡为例,结合地质勘察及岩土试验成果,对该受扰古滑坡体复活机制及稳定性进行了较为全面的分析研究,并对古滑坡体复活演化过程进行数值模拟分析,根据研究结果提出了具体防治措施。主要研究内容如下:论文在前人研究成果上,分析研究古滑坡受扰复活主要影响因素,即滑坡区域所处地形、地质构造、坡体岩土特性、潜在滑动面(带)、人类活动、水的下渗,地震影响、风化作用、水库蓄水及河流冲刷作用等均是古滑坡受扰复活形成原因,提出古滑坡复活是一个动态演变复杂过程,受多种成因因素影响,不同地质条件环境可能诱发滑坡形式不一样,而且随着条件改变随时起变化,我们需要全面系统研究古滑坡复活成因机制与稳定性问题。在研究古滑坡体受扰复活影响因素基础上,以T8地块后缘滑坡为例,从现场调查,分析斜坡地形、水的下渗、地层岩性等地质特征入手,研究受扰古滑坡体复活基本特征、复活成因及破坏机制得出结论:由于人为扰动和暴雨触发导致该滑坡沿古滑动面复活产生蠕滑、拉裂、剪切、滑移破坏。对滑坡体分别采用工程地质分析、传递系数法、FLAC3D软件数值模拟变形过程等多种方法分析评价其稳定性。分别在天然和暴雨触发条件下,采用FLAC3D软件对古滑坡体复活演化过程进行模拟分析,得出在天然状况下滑坡处于欠稳定,暴雨触发后会产生蠕滑、拉裂、剪切、滑移破坏,这与现场调查滑移变形迹象基本一致。论文最后对受扰古滑坡提出治理措施方案,经过综合比较采用抗滑桩为主,同时进行削坡减载、防排水等综合治理方案。
[Abstract]:Human engineering activities will inevitably encounter a new landslide caused by the revival of ancient landslide. It is very important to study the basic characteristics and causes of the revival of this kind of paleo-landslide and evaluate its stability correctly in order to prevent the revival of landslide. Taking the landslide in the rear edge of T8 block as an example, combined with the results of geological survey and geotechnical test, this paper makes a comprehensive analysis and study on the resurrection mechanism and stability of the disturbed ancient landslide. Numerical simulation and analysis on the process of paleo-landslide resurrection and evolution were carried out, and the prevention and cure measures were put forward according to the results of the study. The main research contents are as follows: on the basis of previous research results, the paper analyzes and studies the main influencing factors of the disturbance and resurrection of ancient landslides, that is, the landform, geological structure, rock and soil characteristics of slope body, potential sliding surface (belt, human activity), The infiltration of water, earthquake, weathering, reservoir water storage and river scouring are all the causes of the disturbance and resurrection of ancient landslide. It is suggested that the revival of ancient landslide is a complex process of dynamic evolution and affected by many factors. Different geological conditions may induce landslides in different forms, and with the change of conditions, we need to study the mechanism and stability of paleo-landslide resurrection in a comprehensive and systematic way. On the basis of studying the influencing factors of disturbing and reviving paleo-landslide, taking the back margin landslide of T8 block as an example, this paper analyzes the geological characteristics such as slope topography, water infiltration, stratigraphic lithology and so on, and studies the basic characteristics of the revival of disturbed paleo-landslide. The cause of resurrection and the mechanism of its failure have been concluded that the revival of the landslide along the paleo-slip surface is caused by human disturbance and rainstorm, which results in creeping, pulling, shearing and sliding failure. Engineering geological analysis, transfer coefficient method and FLAC3D software are used to analyze and evaluate the stability of landslide body. Under the condition of natural and rainstorm triggering, the process of paleo-landslide resurrection is simulated and analyzed by FLAC3D software. It is concluded that the landslide is unstable under natural condition, and the creep, tension, shear and slip will occur after triggered by rainstorm. This is basically consistent with the evidence of slip deformation investigated on the spot. Finally, the paper puts forward the control measures for the disturbed ancient landslide. After comprehensive comparison, the anti-slide pile is adopted as the main method, and the comprehensive treatment schemes, such as slope cutting and load reduction, drainage prevention and so on, are carried out at the same time.
【学位授予单位】：西华大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P642.22

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