近距离煤层群下位煤层巷道布置优化研究  

Study on layout optimization of seam gateway under contiguous seams

作　　者：孟浩[1,2] Meng Hao(School of Resources and Safety Engineering, China University of Mining and Technology （Beijing） , Beijing 100083, China Coal Industry Engineering Research Center of Top Coal Caving Mining, Beijing 100083, China)

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083 [2]放顶煤开采煤炭行业工程研究中心,北京100083

出　　处：《煤炭科学技术》2016年第12期44-50,共7页Coal Science and Technology

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)

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。In order to set up the rational layout location of the seam gateway under the downward mining in the contiguous seams, a numerical simulation, theoretical analysis, floor frictional experiment and site test method were applied to the analysis on the floor stress distribution law of the remained coal pillar, stability of the sectional coal pillar, surrounding rock deformation failure features of the gateway and others. The study showed that No. 10 seam mining caused the floor failure depth spread to the level of No. 11 seam gateway. The stress reduced zone had a horizontal distance of 7 m to the retained coal pillar in the upper seam mining. Influenced by the secondary mining, the failure width of the sectional coal pillar in No. 11 seam was about 4 m and the rational inner offset distance in the gateway layout should be over 11 m. When the inner offset distance of 14 m and 20 m applied to the gateway layout in the simulation experiment, the surrounding rock could keep a same degree good stability. In order to improve resource mining rate, the inner offset distance of 14 m selected could en- sure a safety mining operation. Finally a monitoring and measuring on experiment section was conducted in No. 1113 coal mining face and inner offset distance of gateway was selected as 15 m conservatively. The site measurement results showed that under the layout condition, the stability of sectional coal pillar was good, the convergence between two sidewalls along the gateway was 30-220 mm, the convergence between the roof and floor was 20- 110 mm and the surrounding roek deformation of the gateway could be well controlled.

关 键 词：巷道布置 应力分布规律 煤柱稳定性 围岩稳定性 近距离煤层 

分 类 号：TD822[矿业工程—煤矿开采]