摘要
工作面回采巷道的布置方式对巷道矿压现象、变形特性及稳定性影响显著,尤其是在受分叉煤层上分层开采的影响下,下分层工作面回采巷道布置方式变为亟需解决的技术难题。采用数值模拟的方法研究了分叉煤层下分层回采巷道的合理布置方式,分析了5种回采巷道布置的应力分布、围岩变形特征。研究表明:上分层采动引起的煤岩体应力重新分布呈现非均匀分布,上部巷道所受应力集中程度明显大于下部巷道;随着下分层回采巷道由外向内布置,巷道受应力集中影响与变形破坏程度先增大后减小,由外错8m到内错8m,巷道应力集中系数减小82.3%,顶、底板移近量减小90.4%,塑性区发育高度减小74.7%,合理的下分层回采巷道应布置于内错8m与内错16m之间。现场实测证实,回采巷道布置于内错11m时,巷道顶、底板移近量144mm,两帮移近量249mm,可满足工作面安全生产的要求。
The layout of mining roadway in working face has a significant impact on the ground pressure phenomenon,deformation characteristics and roadway stability,especially under the influence of upper slicing mining in bifurcated coal seam,the layout of mining roadway in lower slicing working face is an urgent technical problem need to be solved.The numerical simulation method was used to study the reasonable layout of mining roadway in lower slicing of bifurcated coal seam,and the stress distribution and the deformation characteristics of surrounding rock of five kinds of mining roadway layout were analyzed.The results show that the stress redistribution of the coal and rock mass caused by upper slicing mining is non-uniform,and the stress concentration degree of the upper roadway is obviously greater than that of the lower roadway.With the mining roadway in the lower slicing arranged from outside to inside,the stress concentration effect and the deformation damage degree of roadway firstly increase and then decrease.From the outway staggered roadway of 8 mto the internal misaligned roadway of 8 m,the stress concentration coefficient of roadway decreases by 82.3%,the deformation amount of roof and floor decreases by90.4%,the development height of plastic area decreases by 74.7%,and the reasonable mining roadway in the lower slicing mining should be arranged between the internal misaligned roadway from 8 mto 16 m.According to the field measurement,when the mining roadway arranges in the internal misaligned roadway of 11 m,the deformation amount of roof and floor is 144 mm,and the deformation amount of two sides is 249 mm,which meets the safety production of the working face.
作者
董超伟
张卫清
黄鹏
万威
陈亮亮
DONG Chaowei;ZHANG Weiqingi;HUANG Peng;WAN Wei;CHEN Liangliang(School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;State Key Laboratoryof Coal Resources and Safe Mining,China University of Mining Technology,Xuzhou,Jiangsu 221116,China;Xinjiang Baicheng Zhongwei Coal Industry Co.,Ltd,Baicheng G^unty,Xinjiang 842300,China)
出处
《矿业研究与开发》
CAS
北大核心
2020年第7期4-11,共8页
Mining Research and Development
基金
中国矿业大学煤炭资源与安全开采国家重点实验室自主研究课题资助项目(SKLCRSM19X001)。
关键词
分叉煤层
巷道布置
下部煤层
变形破坏
Bifurcated coal seam
Roadway layout
Lower coal seam
Deformation failure
