厚硬岩组远程上行卸压开采卸压特征及其应用

发布时间：2018-01-24 13:31

本文关键词： 远程卸压开采模拟试验多关键层阻隔性与跳跃性卸压瓦斯抽采　出处：《安徽理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：淮南矿区高瓦斯、低透气性近距离煤层群(B组煤层)在下行卸压开采过程中卸压效果差,瓦斯治理难度大,开采成本高。为了探索矿区深部下保护层A组煤层开采远距离上行卸压B组煤层的可行性,以潘二矿A3煤11223工作面及B4煤层为工程背景,采用理论分析、实验室实验、相似模拟试验以及现场实测的手段,开展了不同关键层结构下保护层开采覆岩应力场、裂隙场演化规律和卸压特征以及关键层破断对被保护层卸压瓦斯涌出动态影响的研究。首先,基于11223工作面与B4煤层间岩层结构特征,构建了工程地质模型,结合岩层物理力学参数,参照关键层理论计算得到11223工作面西二段与东一段关键层层数分别为3层与2层并对岩层进行对应分组。其次,根据11223工作面西二段与东一段不同覆岩顶板条件分别构建走向与倾向相似材料模拟、UDEC走向数值模拟,获得了多关键层条件下远程上行卸压开采采动应力场、裂隙场演化特征及B4煤卸压范围与卸压效果。研究表明关键层阻隔裂隙向上发育,降低B4煤卸压效果且裂隙发育高度随着关键层的破断"跳跃性"发展。然后,对现场试验结果与卸压瓦斯抽采数据进行分析,获得现场应力演化特征以及通过卸压瓦斯抽采量变化反演的现场关键层破断规律,认为西二段比东一段多一层关键层的岩层结构影响裂隙向上发育,导致该段卸压抽采率较低的主要原因。最后,基于以上研究结果,对11223工作面远程上行卸压开采B4煤卸压瓦斯抽采系统巷道联合布置进行优化设计,获得卸压瓦斯抽采巷道的布置方案。
[Abstract]:Huainan mining area, high gas, low permeability of short distance coal seam group B coal seam) in the downward pressure relief mining process of pressure relief effect is poor, gas treatment is difficult. The mining cost is high. In order to explore the feasibility of mining long-distance upward pressure relief group B coal seam in deep protection layer A group coal seam, the engineering background is A3 11223 coal face and B 4 coal seam in Paner Coal Mine. By means of theoretical analysis, laboratory experiments, similar simulation tests and field measurements, the stress fields of overburden mining under different key layer structures are carried out. The evolution law and pressure relief characteristics of fracture field and the dynamic influence of key strata breaking on pressure relief gas emission of protected layer are studied. Firstly, based on the structural characteristics of rock layer between 11223 face and B4 coal seam. The engineering geological model is constructed and combined with the physical and mechanical parameters of the strata. According to the key layer theory calculation, the key layers of the west second and east first section of 11223 face are three and two layers, respectively, and the corresponding rock layers are grouped. Secondly. According to the different overburden roof conditions in the west second and east first section of 11223 face, the simulation of the strike and the tendency of the same material is constructed respectively and the numerical simulation of the UDEC strike is carried out. The dynamic stress field, the evolution characteristics of fracture field and the pressure relief range of B4 coal under the condition of multiple critical layers are obtained. The study shows that the key layers block the development of fracture upward. The effect of reducing the pressure relief of B4 coal is reduced and the height of fracture development develops with the breakage of critical layer "jumping". Then, the field test results and pressure relief gas extraction data are analyzed. The characteristics of stress evolution in the field and the breaking rule of the key layer in the field are obtained. It is considered that the rock structure of one more layer in the western second member than in the east section affects the fracture development upward. Finally, based on the above research results, the combined layout of the roadway of B4 coal relief gas extraction system is optimized based on the above research results. The layout scheme of gas drainage roadway is 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】：2017
【分类号】：TD712.6

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