三汇磨子岩危岩形成过程数值模拟研究

发布时间：2018-04-13 22:06

本文选题：磨子岩危岩 + 破坏模式　；参考：《重庆交通大学》2015年硕士论文

【摘要】：本论文选取合川三汇磨子岩危岩为研究对象,运用理论分析和数值模拟相结合的方法,分析采矿活动下危岩的形成破坏机理,为有效防治矿山类危岩灾害提供可靠的科学依据。总结本文的研究成果,可以得出以下几个主要结论:(1)根据文献资料收集及现场调查分析,危岩区地处新华夏构造体系川东褶皱带华蓥山复式背斜的次级褶皱龙家湾背斜的东翼,属倒转褶皱,陡崖顶部裂隙发育。且磨子岩危岩正下方属重庆合川市三汇镇郑家弯煤矿磨子岩井的矿权设置,采矿活动强烈,对危岩形成影响较大。(2)分析研究区地质环境条件,总结出4条对危岩形成起主要作用的因素,即地质构造条件、构造运动及河流下蚀切割、人类采矿活动及降雨等其他触发因素;将危岩体的发育过程分为4个阶段:陡崖及裂缝的形成、后缘裂缝的扩展、潜在危岩体的形成、危岩体的突然崩落,并做出相应的演化模式图。(3)根据磨子岩危岩的形成演化过程分析,提出了磨子岩危岩为拉裂压剪破坏模式,从主控结构面所受的荷载及弯矩效应等方面,对该种破坏模式进行了受力分析,并且建立了其稳定性分析方法。(4)选取磨子岩W2危岩体为建立有限元分析模型,将采矿活动简化为平面问题,分为八个开挖工况,其中,工况一为初始状态,分析了采矿过程中陡崖及危岩体的位移场和应力场变化特性,即:采矿活动使得陡崖岩体位移增大,应力发生重分布,巷道开挖工作面应力集中;随着矿井开挖深度的逐渐增大,陡崖由初始状态时的0.66cm增大至2.81cm,最大拉应力值由6.50MPa增大至16.30MPa;危岩体后部裂缝尖端拉应力集中,大主应力由初始状态下的0MPa增加到为8.456MPa。(5)基于数值模拟分析结果,选取陡崖及危岩体内几个代表性关键点,K1-K11,分析各个工况下各点的位移及应力变化情况,与磨子岩危岩破坏模式相吻合。
[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.

【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU452

【参考文献】