四川省青川县东河口滑坡成因机制与稳定性分析

发布时间：2018-04-04 08:29

本文选题：东河口滑坡　切入点：数值模拟法　出处：《中国地质大学(北京)》2016年硕士论文

【摘要】：东河口滑坡位于四川省广元市青川县红光乡的东河口村,由“5?12”汶川大地震触发,覆盖了整个东河口村,造成了巨大的人员和财产损失。本文在前人研究的基础上,通过野外勘察、遥感解译、工程钻探的方法,对东河口滑坡的形态特点、成因机制和运动特征等进行了分析和探讨;在野外调查的基础上,利用三维建模软件分别建立原始斜坡和震后滑坡的三维地质模型,基于FLAC3D软件对震前滑坡和震后滑坡进行稳定性分析和多工况计算。力求还原研究区的真实地质概况,根据数值模拟结果预估震后的东河口滑坡在地震、降雨情况下的演化趋势。论文主要成果如下:(1)东河口滑坡的成因演化过程可概括为:地震力作用下,顶部山体脱离母体并沿斜坡加速滑下,滑体解体,一部分堆积,另一部分飞出,飞出的滑体向前滑行,并撞击地面,将地面表层土和植被一铲而光,撞击到对面山体,滑体震裂并转向运动,又一次撞击山体,滑体彻底破碎,形成碎屑流并堵塞青竹江形成两个大的堰塞湖。(2)震前原始斜坡是稳定的,稳定性系数为1.9,现状东河口滑坡天然状态下稳定性系数为2.33。运用FLAC3D软件在原始斜坡模型上加载地震波计算,结果显示,断层上盘位置滑坡发生大的破坏变形,以断层薄弱带为界,岩土体运动位移方向不同。(3)东河口滑坡稳定性的影响因素表现在以下几个方面:复杂的地形地貌、岩石强度参数、降雨以及断层薄弱带的作用。且断层错动的惯性力对滑坡的主滑方向有一定的导向作用。
[Abstract]:The Donghekou landslide is located in the Donghekou Village of Hongguang Township, Qingchuan County, Guangyuan City, Sichuan Province. It was triggered by the Wenchuan earthquake, which covered the whole Donghekou Village and caused huge losses of people and property.On the basis of previous studies, this paper analyzes and discusses the morphological characteristics, genetic mechanism and movement characteristics of the East Estuary landslide by means of field investigation, remote sensing interpretation and engineering drilling, and on the basis of field investigation,The 3D geological models of the original slope and the post-earthquake landslide were established by using 3D modeling software, and the stability analysis and multi-condition calculation of pre-earthquake landslide and post-earthquake landslide were carried out based on FLAC3D software.According to the results of numerical simulation, the evolution trend of the East Estuary landslide under earthquake and rainfall is predicted.The main results of this paper are as follows: (1) the genetic evolution process of the Dongkou landslide can be summarized as follows: under the action of seismic force, the top mountain body breaks away from the parent body and accelerates down the slope, the slip body disintegrates, one part accumulates, the other part flies out.The flying slider slid forward and hit the ground, shoveling the surface soil and vegetation, hitting the opposite mountain, breaking it apart and turning to motion, hitting it again, and completely breaking it apart.Before the earthquake, the original slope is stable, the stability coefficient is 1.9, and the stability coefficient is 2.33 under the natural condition of the Donghekou landslide.Using the FLAC3D software to load the seismic wave on the original slope model, the results show that the landslide in the upper face of the fault has a large failure and deformation, which is bounded by the weak zone of the fault.The factors influencing the stability of Donghekou landslide are as follows: complex topography, rock strength parameters, rainfall and the effect of fault weak zone.And the inertial force of fault dislocation has a certain guiding effect on the main slide direction of the landslide.
【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】：2016
【分类号】：P642.22

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