發(fā)布時間：2018-04-13 22:06

  本文選題：磨子巖危巖 + 破壞模式��； 參考：《重慶交通大學》2015年碩士論文

【摘要】：本論文選取合川三匯磨子巖危巖為研究對象,運用理論分析和數(shù)值模擬相結合的方法,分析采礦活動下危巖的形成破壞機理,為有效防治礦山類危巖災害提供可靠的科學依據(jù)�？偨Y本文的研究成果,可以得出以下幾個主要結論:(1)根據(jù)文獻資料收集及現(xiàn)場調查分析,危巖區(qū)地處新華夏構造體系川東褶皺帶華鎣山復式背斜的次級褶皺龍家灣背斜的東翼,屬倒轉褶皺,陡崖頂部裂隙發(fā)育。且磨子巖危巖正下方屬重慶合川市三匯鎮(zhèn)鄭家彎煤礦磨子巖井的礦權設置,采礦活動強烈,對危巖形成影響較大。(2)分析研究區(qū)地質環(huán)境條件,總結出4條對危巖形成起主要作用的因素,即地質構造條件、構造運動及河流下蝕切割、人類采礦活動及降雨等其他觸發(fā)因素;將危巖體的發(fā)育過程分為4個階段:陡崖及裂縫的形成、后緣裂縫的擴展、潛在危巖體的形成、危巖體的突然崩落,并做出相應的演化模式圖。(3)根據(jù)磨子巖危巖的形成演化過程分析,提出了磨子巖危巖為拉裂壓剪破壞模式,從主控結構面所受的荷載及彎矩效應等方面,對該種破壞模式進行了受力分析,并且建立了其穩(wěn)定性分析方法。(4)選取磨子巖W2危巖體為建立有限元分析模型,將采礦活動簡化為平面問題,分為八個開挖工況,其中,工況一為初始狀態(tài),分析了采礦過程中陡崖及危巖體的位移場和應力場變化特性,即:采礦活動使得陡崖巖體位移增大,應力發(fā)生重分布,巷道開挖工作面應力集中;隨著礦井開挖深度的逐漸增大,陡崖由初始狀態(tài)時的0.66cm增大至2.81cm,最大拉應力值由6.50MPa增大至16.30MPa;危巖體后部裂縫尖端拉應力集中,大主應力由初始狀態(tài)下的0MPa增加到為8.456MPa。(5)基于數(shù)值模擬分析結果,選取陡崖及危巖體內幾個代表性關鍵點,K1-K11,分析各個工況下各點的位移及應力變化情況,與磨子巖危巖破壞模式相吻合。
[Abstract]:This paper selects Hechuan Sanhui mill dangerous rock mass as the research object, using the method of combining theoretical analysis and numerical simulation, analysis of formation damage mechanism of rock under mining activities, provide a reliable scientific basis for effective prevention and control of mine rockfall disaster. Summarize the research results, we can draw the following several main conclusions: (1) according to the the literature data collection and field investigation and analysis of dangerous rock zone is located in the new structure of the Chinese system of dragon bay secondary folds anticline Huayingshan anticline in East Sichuan fold belt of the east wing, is overturned fold, cliff top fissure development. And the mill just below the dangerous rock mass in Hechuan city is Chongqing sanhuizhen Zheng Jia Wan coal mill Iwai mineral rights, mining activity is strong, forming a greater impact on the rock. (2) analysis of the geological condition of the study area, and summarizes 4 plays a major role in the formation of dangerous factors, namely geological conditions, structure Tectonic movement and river erosion cutting, rainfall and other human mining activities and other factors to trigger the development of dangerous rock mass; will be divided into 4 stages: the formation of steep cliffs and crack expansion, edge cracks, the formation of potential unstable rock burst, dangerous rock body, and make the corresponding evolution pattern (3. According to the analysis of the formation and evolution of the mill) dangerous rock mass, the rock Mo Zi Yan as tensile compression and shear failure mode, from the main control structure of surface load and bending effect etc., the failure modes of the stress analysis, and the method was established to analyze its stability. (4) selection of Mo Zi Yan W2 rock body is a finite element analysis model, the mining activity is simplified as a plane problem, divided into eight excavation, the condition for the initial state, analyzes the displacement field of steep and dangerous rock body in the mining process and the change of stress field characteristics, namely: mining activities The increase of cliff rock displacement, stress redistribution, roadway excavation face stress concentration; with the increasing of mine excavation depth, steep cliff by the initial state of 0.66cm increased to 2.81cm, the maximum tensile stress value increased from 6.50MPa to 16.30MPa; the rear rock crack tip stress concentration, main the stress from the initial state of the 0MPa increased to 8.456MPa. (5) numerical simulation based on the results of the analysis, selection of steep and dangerous rock body of several representative key points, K1-K11 analysis, and the stress variation of displacement of each point under various conditions, and the failure mode of rock Mo Zi Yan coincide.

【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU452

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本文編號：1746392