冉家沟4号滑坡形成机理及稳定性研究
发布时间：2018-12-12 08:35
【摘要】：本文以银百高速冉家沟4号滑坡为研究对象。滑坡位于冉家沟右岸斜坡上,为一巨型深层黄土滑坡。滑坡体上发育多级次级滑坎,横向裂缝及串珠落水洞现象明显,滑坡前缘长期受流水冲刷形成不同规模的滑塌体。滑坡对拟建线路该段的桥梁和路基构成威胁。对滑坡的正确认识,分析其形成机理以及准确评价其稳定性,对公路的建设及后期滑坡评估治理具有重要意义。本文在分析滑坡所在地区甘肃省庆阳市区域地质背景基础之上,通过现场实地勘察、室内试验等技术手段掌握滑坡的基本特征。从滑坡的形成条件、形成原因、变形破坏过程以及滑坡的现状等出发,对滑坡形成机理进行分析。采用传统的极限平衡法对滑坡的稳定性进行评价。运用数值模拟进一步分析滑坡的应力分布、变形位移等,更进一步的分析滑坡的破坏特征。论文主要包含以下内容:1、概述甘肃省庆阳市区域地质背景,主要包括地区地理位置、气象水文、地形地貌以及地层岩性等。以此为基础,结合滑坡的基本特征,分析该滑坡的形成条件、变形过程和诱发因素等。2、滑坡的变形破坏总体分为两个过程,第一个过程是从原始斜坡到滑坡初次滑动的过程;第二个过程是在滑坡初次滑动后,滑体堵塞河道,形成堰塞湖,在后期水流作用下,将河道重新冲开,滑体前部阻滑段土体被冲走,阻滑能力减弱,导致滑坡再次或者多次发生前部蠕滑。3、极限平衡法具有理论完善、计算简便的特点,是滑坡稳定性评价的常用方法。对于冉家沟4号滑坡建立4个典型地质剖面,采用极限平衡法用两种工况进行稳定性计算。该滑坡由于多次滑动形成次级滑面,稳定性计算时对各次级滑面分别计算。滑坡稳定性影响因素较多,为了能够反应各个因素的影响程度,论文中对滑坡稳定性影响因素进行了敏感性分析。4、为了更好的反应出滑坡在失稳破坏过程中,各个部位的变形位移以及受力情况,采用Midas/GTS对滑坡进行数值模拟,对其应力、应变以及位移进行分析。模拟结果显示,该滑坡次级滑体比主滑体稳定性更差,同时,降雨会导致滑坡的稳定性进一步恶化。
[Abstract]:In this paper, Yinbai High Speed Lanjiagou No. 4 landslide is taken as the research object. The landslide is located on the right bank slope of Ranjiagou, a huge deep loess landslide. Multiple secondary slips are developed on the landslide, transverse cracks and beaded caverns are obvious, and the landslide front edge is washed by flowing water for a long time to form different scale landslide bodies. The landslide poses a threat to the bridge and subgrade of the proposed section of the road. The correct understanding of landslide, the analysis of its forming mechanism and the accurate evaluation of its stability are of great significance to the construction of highway and the evaluation and treatment of landslide in the later stage. Based on the analysis of the regional geological background of Qingyang City, Gansu Province, the paper grasps the basic characteristics of landslide through field investigation and laboratory test. Based on the conditions, causes, deformation and failure process of landslide, and the present situation of landslide, the forming mechanism of landslide is analyzed. The traditional limit equilibrium method is used to evaluate the stability of landslide. The stress distribution, deformation and displacement of the landslide are further analyzed by numerical simulation, and the failure characteristics of the landslide are further analyzed. The main contents of this paper are as follows: 1. The regional geological background of Qingyang city in Gansu Province is summarized, which mainly includes regional geographical location, meteorology and hydrology, topography and topography, stratigraphic lithology and so on. On this basis, combined with the basic characteristics of the landslide, the forming conditions, deformation process and induced factors of the landslide are analyzed. 2. The deformation and failure of the landslide can be divided into two processes as a whole. The first process is from the original slope to the first slip of the landslide; The second process is that after the first slide of the landslide, the slide body blocks the river channel and forms a barrier lake. Under the action of the later water flow, the river course is washed away again, and the soil in the front part of the slide body is washed away, so the ability to resist sliding is weakened. The limit equilibrium method, which has the characteristics of perfect theory and simple calculation, is the common method of landslide stability evaluation. For Ranjiagou No. 4 landslide, four typical geological sections were established, and the stability was calculated by using limit equilibrium method and two working conditions. The landslide is formed into secondary slide surface because of multiple slippage, and the stability of each secondary slide surface is calculated separately when calculating the stability of the landslide. There are many influencing factors on landslide stability. In order to reflect the influence degree of each factor, the sensitivity analysis of landslide stability influencing factors is carried out in this paper. 4, in order to better reflect the landslide in the process of instability and failure, The stress, strain and displacement of the landslide were simulated by Midas/GTS, and the stress, strain and displacement of the landslide were analyzed. The simulation results show that the stability of the secondary landslide is worse than that of the main landslide, and the stability of the landslide will be further deteriorated by rainfall.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P642.22
本文编号：2374271
[Abstract]:In this paper, Yinbai High Speed Lanjiagou No. 4 landslide is taken as the research object. The landslide is located on the right bank slope of Ranjiagou, a huge deep loess landslide. Multiple secondary slips are developed on the landslide, transverse cracks and beaded caverns are obvious, and the landslide front edge is washed by flowing water for a long time to form different scale landslide bodies. The landslide poses a threat to the bridge and subgrade of the proposed section of the road. The correct understanding of landslide, the analysis of its forming mechanism and the accurate evaluation of its stability are of great significance to the construction of highway and the evaluation and treatment of landslide in the later stage. Based on the analysis of the regional geological background of Qingyang City, Gansu Province, the paper grasps the basic characteristics of landslide through field investigation and laboratory test. Based on the conditions, causes, deformation and failure process of landslide, and the present situation of landslide, the forming mechanism of landslide is analyzed. The traditional limit equilibrium method is used to evaluate the stability of landslide. The stress distribution, deformation and displacement of the landslide are further analyzed by numerical simulation, and the failure characteristics of the landslide are further analyzed. The main contents of this paper are as follows: 1. The regional geological background of Qingyang city in Gansu Province is summarized, which mainly includes regional geographical location, meteorology and hydrology, topography and topography, stratigraphic lithology and so on. On this basis, combined with the basic characteristics of the landslide, the forming conditions, deformation process and induced factors of the landslide are analyzed. 2. The deformation and failure of the landslide can be divided into two processes as a whole. The first process is from the original slope to the first slip of the landslide; The second process is that after the first slide of the landslide, the slide body blocks the river channel and forms a barrier lake. Under the action of the later water flow, the river course is washed away again, and the soil in the front part of the slide body is washed away, so the ability to resist sliding is weakened. The limit equilibrium method, which has the characteristics of perfect theory and simple calculation, is the common method of landslide stability evaluation. For Ranjiagou No. 4 landslide, four typical geological sections were established, and the stability was calculated by using limit equilibrium method and two working conditions. The landslide is formed into secondary slide surface because of multiple slippage, and the stability of each secondary slide surface is calculated separately when calculating the stability of the landslide. There are many influencing factors on landslide stability. In order to reflect the influence degree of each factor, the sensitivity analysis of landslide stability influencing factors is carried out in this paper. 4, in order to better reflect the landslide in the process of instability and failure, The stress, strain and displacement of the landslide were simulated by Midas/GTS, and the stress, strain and displacement of the landslide were analyzed. The simulation results show that the stability of the secondary landslide is worse than that of the main landslide, and the stability of the landslide will be further deteriorated by rainfall.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P642.22
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