上行卸压开采厚硬岩组破断演化与卸压特征研究

发布时间：2018-03-12 12:44

本文选题：上行卸压开采　切入点：厚硬岩组　出处：《安徽理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：卸压开采己成为高瓦斯突出煤层群安全开采和瓦斯抽采有效方法之一,可分为上行卸压开采和下行卸压开采两种。在上行卸压开采过程中,覆岩卸压区域及瓦斯抽采的范围与顶板岩层的冒落、层间岩石物理特性、工作面长度、开采层厚度和瓦斯压力及含量等因素密切相关。本文主要研究了层间存在数量不等的厚硬岩层时上行卸压开采过程中覆岩破断演化过程以及卸压特征。根据A3煤和B4煤的煤层赋存特征、物理力学特征和采矿技术特点,本文采用现场试验、数值模拟分析、相似材料模拟试验分析、和理论分析相结合的研究方法,对上行卸压开采过程中厚硬岩组破断演化过程及其对B4煤的卸压作用进行了研究。通过现场取芯和实验室试验获得A3煤工作面上覆煤岩层赋存特征及物理力学特性,并分析计算确定了A3煤上行开采的可行性。构建了不同岩层组合条件下开采A3煤卸压保护B4煤的UDEC2D数值模拟模型和实验室相似材料模拟试验模型,获得了上行卸压开采过程中厚硬岩层破断特征及其对覆岩应力、位移、裂隙演化特征的影响规律。基于试验数据分析,得到层间厚硬岩组在上行卸压开采过程中的破断演化过程及其对上行卸压开采效果的影响。
[Abstract]:Pressure relief mining has become one of the effective methods for safe mining and gas drainage mining of high gas outburst coal seams, which can be divided into two kinds: uplink pressure relief mining and downgoing pressure relief mining. The area of overburden pressure relief, the scope of gas drainage, the caving of roof rock, the physical characteristics of interlayer rock, the length of working face, The thickness of mining strata is closely related to the gas pressure and content. This paper mainly studies the overburden fracture evolution process and pressure relief characteristics in the process of upward pressure relief mining when there are different amount of thick hard strata between layers. According to the characteristics of coal seam occurrence, physical mechanics and mining technology of A _ 3 and B _ 4 coal, this paper adopts the research methods of field test, numerical simulation analysis, similar material simulation test analysis, and theoretical analysis. The fracture evolution process of thick hard rock formation and its pressure relief to B _ 4 coal during upward pressure relief mining are studied. The occurrence characteristics and physical and mechanical properties of overlying strata on A3 coal face are obtained by field core-taking and laboratory tests. The feasibility of upward mining of A3 coal is determined by analysis and calculation. The UDEC2D numerical simulation model of mining A3 coal under different rock combination conditions and the simulation test model of similar materials in laboratory are constructed. The fracture characteristics of thick hard rock and its influence on overburden stress, displacement and fracture evolution are obtained. Based on the analysis of test data, the fracture evolution process and its influence on the effect of upward pressure relief mining of the interlayer thick hard rock group in the process of upward pressure relief mining are obtained.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD325

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