煤柱宽度对巷道围岩稳定性影响分析  

Study on the Stability of Rock Surrounding Gateway with Different Coal-pillar Widths

作　　者：杨科[1] 谢广祥[1] 常聚才[1] 

机构地区：[1]安徽理工大学煤矿安全高效开采省部共建教育部重点实验室,安徽淮南232001

出　　处：《地下空间与工程学报》2009年第5期991-995,共5页Chinese Journal of Underground Space and Engineering

基　　金：安徽省优秀青年基金项目(08040106839);国家自然科学基金资助项目(50774001);安徽高等学校省级自然科学研究项目(KJ2009A139)

摘　　要：由于煤柱宽度的变化以及相对工作面位置的不同,矿山压力作用下造成的岩层移动和应力重新分布将对巷道维护及其稳定性产生重要影响。在现场实测分析基础上,应用计算机数值模拟(FLAC3D)综合分析了煤柱宽度变化对巷道围岩应力场分布及应力演化的影响。研究表明,不同宽度煤柱回采期间巷道围岩应力场分布特征均有很大差异,煤柱和工作面内煤体应力随煤柱宽度变化发生转移,巷道围岩稳定性是煤柱宽度变化引起巷道围岩应力分布及其演化共同作用的结果;煤柱的合理宽度应小于工作面内应力向煤柱内转移的临界宽度。该研究为煤柱留设、巷道布置、支护参数选择、巷道围岩稳定性控制等方面提供了理论依据。Because of the variety of coal-pillar width and the different locations to face,the stability and maintenance of gateway are seriously influenced by the stress redistribution and evolvement of rock strata under rock pressure.According to the geological and mining technical conditions of the No.1151（3） fully mechanized top-coal caving（FMTC） mining face in Xieqiao Mine and based on the analysis of spot test,the stress distribution and development of gateway are synthetically investigated with different coal-pillar widths by numerical simulation FLAC3D. The results show that the stress distribution and development of rocks surrounding gateway are obviously diverse and the stress distribution of coal pillar and coal entity are displaced with different coal - pillar widths during caving. The stability of gateway is determined on the stress distribution and its development of coal entity and coal pillar and appropriate width of coal pillar is less than the critical displacing stress - width. These would provide the theoretical basis for the rational setting of the coal pillar width, gateway laying, support parameter selection, stability control of the gateway surrounding rock of the mining gateway and for the safe and economic production etc.

关 键 词：煤柱 综放 围岩稳定性 应力分布及演化 数值模拟 

分 类 号：TD32[矿业工程—矿井建设]