【摘要】：本文以銀百高速冉家溝4號滑坡為研究對象�；挛挥谌郊覝嫌野缎逼律�,為一巨型深層黃土滑坡�；麦w上發(fā)育多級次級滑坎,橫向裂縫及串珠落水洞現(xiàn)象明顯,滑坡前緣長期受流水沖刷形成不同規(guī)模的滑塌體�；聦M建線路該段的橋梁和路基構(gòu)成威脅。對滑坡的正確認識,分析其形成機理以及準確評價其穩(wěn)定性,對公路的建設(shè)及后期滑坡評估治理具有重要意義。本文在分析滑坡所在地區(qū)甘肅省慶陽市區(qū)域地質(zhì)背景基礎(chǔ)之上,通過現(xiàn)場實地勘察、室內(nèi)試驗等技術(shù)手段掌握滑坡的基本特征。從滑坡的形成條件、形成原因、變形破壞過程以及滑坡的現(xiàn)狀等出發(fā),對滑坡形成機理進行分析。采用傳統(tǒng)的極限平衡法對滑坡的穩(wěn)定性進行評價。運用數(shù)值模擬進一步分析滑坡的應(yīng)力分布、變形位移等,更進一步的分析滑坡的破壞特征。論文主要包含以下內(nèi)容:1、概述甘肅省慶陽市區(qū)域地質(zhì)背景,主要包括地區(qū)地理位置、氣象水文、地形地貌以及地層巖性等。以此為基礎(chǔ),結(jié)合滑坡的基本特征,分析該滑坡的形成條件、變形過程和誘發(fā)因素等。2、滑坡的變形破壞總體分為兩個過程,第一個過程是從原始斜坡到滑坡初次滑動的過程;第二個過程是在滑坡初次滑動后,滑體堵塞河道,形成堰塞湖,在后期水流作用下,將河道重新沖開,滑體前部阻滑段土體被沖走,阻滑能力減弱,導致滑坡再次或者多次發(fā)生前部蠕滑。3、極限平衡法具有理論完善、計算簡便的特點,是滑坡穩(wěn)定性評價的常用方法。對于冉家溝4號滑坡建立4個典型地質(zhì)剖面,采用極限平衡法用兩種工況進行穩(wěn)定性計算。該滑坡由于多次滑動形成次級滑面,穩(wěn)定性計算時對各次級滑面分別計算�；路€(wěn)定性影響因素較多,為了能夠反應(yīng)各個因素的影響程度,論文中對滑坡穩(wěn)定性影響因素進行了敏感性分析。4、為了更好的反應(yīng)出滑坡在失穩(wěn)破壞過程中,各個部位的變形位移以及受力情況,采用Midas/GTS對滑坡進行數(shù)值模擬,對其應(yīng)力、應(yīng)變以及位移進行分析。模擬結(jié)果顯示,該滑坡次級滑體比主滑體穩(wěn)定性更差,同時,降雨會導致滑坡的穩(wěn)定性進一步惡化。
[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.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P642.22

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