本文選題：滑坡 + 穩(wěn)定性分析��； 參考：《中國礦業(yè)大學》2015年碩士論文

【摘要】：滑坡是自然界中常見的地質災害,分布廣泛、發(fā)生頻繁、危害性大。一旦失穩(wěn)滑動,將嚴重威脅人民群眾的生命財產和各種工程安全,造成重大損失。隨著人類工程活動規(guī)模日益擴大,礦山開采、交通運輸、水利等建設工程中所遇到的滑坡穩(wěn)定性問題也越來越突出。因此通過實地考查分析滑坡成因機制,利用科學手段評價滑坡穩(wěn)定性,采取相應措施對危險滑坡進行治理,對于滑坡地質災害的防治,保障人民生命財產的安全具有最要意義。本文以四川省達州市文家坪滑坡為研究對象,在收集各種相關地質資料的基礎上,結合地質工程評價原理、土力學、工程地質學、水文地質學等理論對滑坡區(qū)的自然地理條件、水文地質條件、工程地質條件進行了分析,了解滑坡的基本特征、形成機理和發(fā)展變化規(guī)律。然后采用工程地質分析法和極限平衡法對滑坡進行定性和定量評價。建立地質力學模型,利用數(shù)值分析方法對邊坡穩(wěn)定性情況進行分析。而后根據(jù)評價的結果,選取合適的相似材料建立物理模型,進行滑坡模型試驗,觀察降雨工況下邊坡變形情況。主要得出以下結論:(1)根據(jù)現(xiàn)場踏勘可知,滑坡體變形主要集中在C區(qū)和D區(qū)后緣及中上部,多以拉裂縫為主。后期降雨使斜坡變形逐步發(fā)展,目前尚未形成貫通性滑動帶。(2)根據(jù)已有資料對滑坡穩(wěn)定性進行了定性和定量分析與評價,計算出暴雨工況下安全系數(shù)小于1.05,表明該滑坡在天然工況下穩(wěn)定,在暴雨工況下欠穩(wěn)定。(3)運用有限元分析軟件ABAQUS,通過構建地質模型,運用強度折減法進行數(shù)值模擬分析,分析其塑形變形特征和變化規(guī)律,所得結果與實際工程相符。(4)模型試驗結果表明該滑坡發(fā)展過程是一個循序漸進的過程,其主要劃分為五個階段:即坡體滲流路徑和坡面沖蝕溝的形成階段、變形階段、滑動階段、劇滑階段及穩(wěn)定階段。(5)降雨過程中裂縫發(fā)展對邊坡穩(wěn)定性有著重要的影響,其主要表現(xiàn)為:裂縫中由于持續(xù)降雨形成積水,產生靜水壓力,增加了坡體下滑力,減弱滑面阻力,滑面處抗滑力減小,抗剪強度降低,進而穩(wěn)定系數(shù)降低,促進滑坡發(fā)生。(6)根據(jù)文章穩(wěn)定性分析及下滑推力的計算的結果,推薦治理方案采用“抗滑樁分級支擋工程+裂縫封填工程”的綜合治理方案。
[Abstract]:Landslide is a common geological hazard in nature, which is widely distributed, frequent and harmful. Once unstable and sliding, it will seriously threaten the life and property of the people and the safety of all kinds of projects, causing great losses. With the increasing scale of human engineering activities, the landslide stability problems encountered in mining, transportation, water conservancy and other construction projects are becoming more and more prominent. Therefore, it is of the most important significance for the prevention and control of landslide geological hazard and the safety of people's life and property to analyze and analyze the formation mechanism of landslide on the spot, to evaluate landslide stability by scientific means, and to take corresponding measures to control dangerous landslide. This paper takes Wenjiaping landslide in Dazhou City, Sichuan Province as the research object. On the basis of collecting all kinds of relevant geological data, combined with the theory of geological engineering evaluation, soil mechanics, engineering geology, hydrogeology and so on, this paper analyzes the natural geographical conditions of the landslide area. The hydrogeological conditions and engineering geological conditions are analyzed to understand the basic characteristics, formation mechanism and development law of landslide. Then the engineering geological analysis method and limit equilibrium method are used to evaluate the landslide qualitatively and quantitatively. The geomechanical model is established and the stability of slope is analyzed by numerical analysis method. Then according to the evaluation results, the physical model is established by selecting suitable similar materials, and the landslide model test is carried out to observe the slope deformation under rainfall conditions. The main conclusions are as follows: (1) according to the field survey, the deformation of the landslide is mainly concentrated in the rear edge and upper part of area C and D, and is mainly composed of tensile fractures. The slope deformation is gradually developed by rainfall in the later period, but no through slip zone has been formed at present. (2) according to the available data, the stability of landslide is qualitatively and quantitatively analyzed and evaluated. The safety factor is less than 1.05 under heavy rain condition, which indicates that the landslide is stable under natural condition and unstable under rainstorm condition. (3) by using finite element analysis software Abaqus, the geological model is built and the strength reduction method is used to carry out numerical simulation analysis. The results of model test show that the development of the landslide is a step by step process. It is mainly divided into five stages: the formation stage of slope seepage path and erosion trench on slope surface, deformation stage, sliding stage, sharp sliding stage and stabilization stage) the development of cracks has an important influence on slope stability during rainfall. The main results are as follows: hydrostatic pressure is produced due to the continuous rainfall in the cracks, which increases the sliding force of the slope body, weakens the sliding surface resistance, reduces the anti-slip force and reduces the shear strength at the sliding surface, and then the stability coefficient decreases. According to the analysis of the stability of the paper and the result of the calculation of the sliding thrust, it is recommended that the comprehensive treatment scheme of the crack sealing project of the anti-slide pile grade supporting and retaining engineering should be adopted.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P642.22

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