冉家溝4號滑坡形成機(jī)理及穩(wěn)定性研究
[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.
【學(xué)位授予單位】:長安大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:P642.22
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 李小雷;張澤坤;羅威;左德元;;H型抗滑樁加固膨脹土滑坡的有限元分析及優(yōu)化設(shè)計(jì)[J];路基工程;2016年06期
2 張強(qiáng);;基于有限元強(qiáng)度折減法與傳統(tǒng)極限平衡法的邊坡穩(wěn)定性分析[J];北方交通;2016年06期
3 張澤林;吳樹仁;唐輝明;黎志恒;趙成;張永軍;王濤;;蘭州黃河階地演變過程對滑坡活動(dòng)的控制效應(yīng)[J];地球科學(xué)(中國地質(zhì)大學(xué)學(xué)報(bào));2015年09期
4 朱桂春;;彭家灣滑坡形成機(jī)理和穩(wěn)定性分析研究[J];四川建材;2014年01期
5 王濤;吳樹仁;石菊松;辛鵬;石玲;;國內(nèi)外典型工程滑坡災(zāi)害比較[J];地質(zhì)通報(bào);2013年12期
6 殷志強(qiáng);陳紅旗;褚宏亮;徐永強(qiáng);趙無忌;;2008年以來中國5次典型地震事件誘發(fā)地質(zhì)災(zāi)害主控因素分析[J];地學(xué)前緣;2013年06期
7 張濤;曾琳潔;馮文凱;;兩河口滑坡形成機(jī)理及穩(wěn)定性分析[J];甘肅水利水電技術(shù);2013年06期
8 李天星;;國內(nèi)外可持續(xù)發(fā)展指標(biāo)體系研究進(jìn)展[J];生態(tài)環(huán)境學(xué)報(bào);2013年06期
9 周志軍;牛涌;張鐵柱;;基于改進(jìn)Sarma法的巖質(zhì)邊坡穩(wěn)定性分析[J];交通運(yùn)輸工程學(xué)報(bào);2013年01期
10 鄭穎人;;巖土數(shù)值極限分析方法的發(fā)展與應(yīng)用[J];巖石力學(xué)與工程學(xué)報(bào);2012年07期
,本文編號:2374271
本文鏈接:http://www.wukwdryxk.cn/guanlilunwen/gongchengguanli/2374271.html