近距离煤层群下位煤层巷道布置优化研究

发布时间：2018-05-30 18:03

本文选题：巷道布置 + 应力分布规律　；参考：《煤炭科学技术》2016年12期

【摘要】：为了确定近距离煤层群下行开采下位煤层巷道合理布置位置,采用数值模拟、理论分析、底摩擦试验及现场测试的方法,对残留煤柱下底板应力分布规律、区段煤柱稳定性、巷道围岩变形破坏特征等进行分析。研究表明:10号煤层开采对底板造成的破坏深度波及到11号煤层巷道所在水平;应力降低区距离上位煤层开采残留煤柱水平距离7 m,11号煤层区段煤柱受二次采动影响破坏宽度约4 m,巷道布置中合理内错距应保证大于11 m;模拟试验确定巷道采用内错距14、20 m布置时,围岩可保持相同程度的较好稳定性,为提高资源采出率,内错距选取14 m即可保证安全回采工作;最后对1113工作面进行试验段监测,巷道内错距保守选取15 m,实测结果表明,该布置条件下区段煤柱稳定性较好,巷道两帮移近量为30~220 mm,顶底板移近量为20~110 mm,巷道围岩变形较好控制。
[Abstract]:In order to determine the reasonable location of the roadway of the lower coal seam in the downgoing mining of the short distance coal seam group, the method of numerical simulation, theoretical analysis, bottom friction test and field test is used to analyze the stress distribution law under the residual coal pillar and the stability of the coal pillar in the section. The deformation and failure characteristics of roadway surrounding rock are analyzed. The results show that the damage depth caused by the mining of No. 10 coal seam to the floor extends to the level of the roadway of coal seam No. 11; The horizontal distance between the stress reduction area and the upper coal seam mining residual pillar is 7 m, the destruction width of the coal pillar in the 11 coal seam section affected by secondary mining is about 4 m, and the reasonable internal dislocation distance in the roadway layout should be greater than 11 m.The simulation test determines the roadway mining. When the internal offset is 14 ~ 20 m, The surrounding rock can keep good stability to the same extent, in order to improve the recovery rate of resources, the safe mining work can be ensured by selecting 14 m internal dislocation distance, and finally, the test section of 1113 face is monitored, and the misalignment distance of roadway is conservatively selected 15 m. The measured results show that, Under the condition of this arrangement, the stability of coal pillar in section is good, the two sides of roadway are 30 ~ 220mm, the distance of roof and floor is 20 ~ 110mm, and the deformation of surrounding rock of roadway is controlled well.
【作者单位】：中国矿业大学(北京)资源与安全工程学院;放顶煤开采煤炭行业工程研究中心;
【基金】：国家重点基础研究发展计划(973计划)资助项目(2013CB227903) 国家自然科学基金面上基金资助项目(51574244);国家自然科学基金煤炭联合基金资助项目(U1361209)
【分类号】：TD353;TD263.1

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