特厚顶煤大断面强采动煤巷围岩变形机理及支护对策  

Deformation Mechanism of Coal Roadway Influenced by Strong Mining in Extremely-thick Coal-seam and Supporting Countermeasure

作　　者：郭璋 岑旺 黄锐 姜鹏飞[2] 张剑[2] 

机构地区：[1]伊泰集团酸刺沟煤矿,内蒙古鄂尔多斯017000 [2]天地科技股份有限公司开采设计事业部,北京100013

出　　处：《煤矿开采》2015年第2期50-55,共6页Coal Mining Technology

基　　金："十二五"国家科技支撑计划项目(2012BAK04B06);天地科技生产力转化基金项目(KJ-2014-TDKC-01)

摘　　要：以酸刺沟煤矿6．特厚煤层大采高综放回采巷道支护为工程背景，基于井下地质力学实测结果，采用数值模拟方法，对比分析了酸刺沟煤矿6．煤层不同煤柱宽度和不同巷道断面尺寸下煤岩体的受力、变形及破坏特征。研究结果表明：6。煤层顶板结构较为单一，以粗砂岩为主，不同位置强度不同，大多在40～80MPa之间，巷帮煤体平均抗压强度为19．80MPa，所测测站中最大水平主应力为7．94MPa，总体处于较低的应力水平；煤柱宽度由15m增加到20m时，巷道变形减小最为显著；煤柱宽度由25m增大到30m时，巷道变形减小趋势变得不明显；巷道掘进与工作面回采阶段巷道围岩应力随宽度增加的变化趋势相同，随着巷道宽度的增加，巷帮垂直应力呈线性增加，巷道顶板的水平应力呈线性减小。基于上述结论，对酸刺沟煤矿6上煤层1109胶运巷进行了支护设计与井下试验．工作面回采后巷道断面收缩率小于15％．实现了特厚顶煤大断面强采动围岩蛮形的有效棒制。Applying numerical simulation, stress, deformation and failure characteristic of surrounding rock under different coal-pillar widths and section sizes was comparably analyzed on the basis of underground geological and mechanics test result from 6-upper coalseam of Suancigou Colliery. Result showed that roof structure of 6-upper coalseam was simple and dominated by coarse sandstone, its strength varied within 40 -80MPa, average compression strength of two-side coal was 19. 8MPa, measured maximum horizontal principal stress was 7.94MPa which was in lower stress level. When coal-pillar width increased from 15m to 20m, roadway deformation reduction was obvious; When it increased from 25m to 30m, deformation reduction tendency was noteless. In roadway driving and face mining, the tendency of surrounding rock stress increasing with coal-pillar width was the same. With roadway width increasing, vertical stress linearly rose, and horizontal stress linearly reduced. On the basis of the results, supporting design of 1109 transportation roadway in 6-upper coal-seam was made, underground test showed that roadway convergence ratio was minor than 15%. Surrounding rock de- formation influenced by strong mining in extremely-thick coalseam was controlled effectively.

关 键 词：特厚顶煤 大断面煤巷 强采动 应力变化 支护对策 

分 类 号：TD353[矿业工程—矿井建设]