褶皱区底煤厚度对动载诱发巷道底板冲击的影响  

Effect of Bottom Coal Thickness on Roadway Floor Burst Induced by Dynamic Disturbance in Folded Region

作　　者：陈峰[1] 窦林名[2,3] 王桂峰[2,3] 谢群[2,3] 谢龙[2,3] 

机构地区：[1]上海大屯能源股份有限公司,江苏徐州221600 [2]煤炭资源与安全开采国家重点实验室,江苏徐州221006 [3]中国矿业大学矿业工程学院,江苏徐州221006

出　　处：《煤矿安全》2014年第7期175-178,182,共5页Safety in Coal Mines

基　　金：国家重点基础研究发展计划(973计划)资助项目(2010CB226805);国家自然科学基金和神华集团有限公司联合资助项目(51174285);江苏高校优势学科建设工程资助项目(PAPD)

摘　　要：为了探讨褶皱区不同底煤厚度对动载诱发巷道底板冲击的影响,使用岩体力学和FLAC2D有限差分数值模拟软件研究了不同底煤厚度作用下应力波诱发特厚煤层巷道底板冲击的动态响应规律。研究表明,动力扰动的作用是使处于极限应力下的煤体应力增加并打破平衡状态从而诱发底板冲击;动载作用下,若底煤下方为厚度较大的坚硬粗砂岩,当底煤厚度d<3 m时,当受一定强度应力波扰动时并不失稳;当底煤厚度d≥3 m时,底板容易受扰动失稳,且底板冲击显现强度呈缓慢增加;首次冲击失稳后,二次冲击矿压危险性降低。In order to explore the effect of different bottom coal thickness on roadway floor burst induced by dynamic disturbance, dynamic response laws of roadway floor burst of special thick coal seam induced by stress wave at different bottom coal thickness were studied by using rock mechanics and FLAC2D finite difference numerical software. The results showed that the role of dynamic disturbance was to increase coal stress, break the balance condition and induce floor burst under ultimate stress. The floor instability would not be caused as and the floor instability would be caused easily and strength of floor burst increased slowly as under dynamic loads if bottom coal below was formed by the thick and hard coarse sandstone. The risk of secondary floor burst would decrease after first floor burst.

关 键 词：底板冲击 底煤厚度 动载扰动 数值模拟 褶皱区 

分 类 号：TD324[矿业工程—矿井建设]