陈四楼煤矿高承压水上采动底板突水机理研究

发布时间：2018-03-03 20:33

本文选题：陈四楼煤矿　切入点：高承压水　出处：《中国矿业大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文以陈四楼煤矿21701工作面为研究基础和现场实践背景,综合运用弹性力学理论分析、数值模拟等手段方法,从煤层底板岩体采动支承应力与下伏承压水相互影响下底板岩体耦合作用机制入手,分析了采煤底板岩体的应力分布规律、变形破坏特征及突水机理,最后将研究成果应用于陈四楼煤矿底板下伏高承压岩溶水的防治。本文主要取得了以下成果:(1)建立煤层回采过程顶板初次来压和周期来压底板岩体在采动支承压力和承压水压力耦合作用下力学分析模型,运用弹性力学分析理论对采煤工作面回采过程中底板岩体内的应力变化分布规律进行分析,推导出底板破坏最大深度表达式。(2)利用数值模拟软件FLAC3D对承压水上采动底板岩体变形破坏特征与突水机理进行研究分析,从底板采动破坏特征、位移变化规律、应力分布规律及孔隙渗流规律入手,探讨应力场与渗流场共同作用下承压水上底板岩体变形破坏特征及突水机理,为煤矿采动底板突水的防治技术提供了技术指导。(3)根据陈四楼煤矿底板注浆加固改造生产实践及课题研究成果,从分析陈四楼煤矿二2煤底板下伏高承压岩溶水发育特征入手,通过对采煤工作面底板突水的危险程度进行评价,得出底板注浆加固主要存在问题,提出了底板注浆钻孔倾角随钻孔深度变化规律曲线大致可近似用倾角30o~40o直线分析代替,优化了底板注浆加固改造效果。
[Abstract]:This paper takes the 21701 face of Chensilou Coal Mine as the research foundation and the field practice background, synthetically uses the elastic mechanics theory analysis, the numerical simulation and so on the method and so on. Based on the interaction between mining support stress and underlying pressure water, the stress distribution, deformation and failure characteristics and water inrush mechanism of coal seam floor rock mass are analyzed. Finally, the research results are applied to the prevention and cure of karst water under the floor of Chensilou coal mine. The following achievements are obtained in this paper: 1) the first pressure of roof and the pressure of roof in mining are established. A mechanical analysis model under the coupling of pressure and pressure, Based on the theory of elastic mechanics, the stress distribution in the bottom slate during the mining process of coal mining face is analyzed. The expression of maximum depth of floor failure is derived. (2) the deformation and failure characteristics and water inrush mechanism of mining floor rock mass on confined water are studied and analyzed by using numerical simulation software FLAC3D. The characteristics of floor mining failure and the law of displacement change are analyzed. Starting with the law of stress distribution and pore seepage, this paper discusses the deformation and failure characteristics and water inrush mechanism of bottom rock mass under the combined action of stress field and seepage field. This paper provides technical guidance for prevention and cure technology of coal mining floor water inrush. According to the production practice and subject research results of strengthening and retrofitting the floor slab of Chensilou coal mine, this paper analyzes the development characteristics of high bearing karst water under the coal floor of No. 2 coal seam in Chensilou Coal Mine. Based on the evaluation of the dangerous degree of water inrush from the floor of the coal mining face, the main problems existed in the grouting reinforcement of the bottom slab are obtained, and the curve of the variation law of the borehole inclination angle with the drilling depth of the bottom slab grouting can be approximately replaced by the straight line analysis of the inclination angle 30o40 o. The effect of reinforcement and reconstruction of bottom slab by grouting is optimized.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD745.2

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