摘要
为了解决孤岛综放工作面沿空掘巷矿压显现剧烈、巷道围岩控制困难的难题,运用理论计算、数值模拟及现场实测的方法,研究了孤岛综放工作面回采巷道在不同宽度窄煤柱条件下的围岩稳定状况。基于采空区侧煤体支承压力分布特征以及沿空掘巷的力学模型,分别从内应力场和极限平衡理论角度计算分析,确定了护巷窄煤柱留设宽度的合理尺寸范围为4.46~7.3m。采用数值模拟方法对窄煤柱留设尺寸进行了对比分析,得到3204孤岛综放工作面护巷窄煤柱的最优尺寸为5 m。现场监测数据表明:3204工作面回风巷道两帮的最大变形量为147 mm,顶底板最大变形量为95 mm,能够满足安全生产要求。
In order to solve problems of the severe strata pressure characteristics of the gob-side entry driving and the difficulty in controlling roadway surrounding rock in the isolated fully mechanized caving face, the surrounding rock stability of roadway at isolated fully mechanized caving face under the condition of different width coal pillars was studied based on the theory analysis,numerical simulation and practice method. Based on the abutment pressure distribution regularities combined with the structural mechanical model of roadway driving along goaf, calculating and analyzing respectively from internal stress field and limit equilibrium theory, it is determined that the reasonable width of narrow coal pillar is between 4.46 m and 7.3 m. Using numerical simulation method, the size of narrow coal pillar is compared and analyzed, and the optimal size of narrow coal pillar is 5 m.Field monitoring indicated that the maximum deformation amount of the two sides of the roadway in the working face of 3204 is147 mm, and the maximum deformation amount of the top and bottom is 95 mm, which can meet the requirements of safety production.
作者
姚博
康天合
尹博
YAO Bo;KANG Tianhe;YIN Bo(Institute of Mining Technology,Taiyuan University of Technology,Taiyuan 030024,Chin)
出处
《煤矿安全》
CAS
北大核心
2018年第6期130-134,共5页
Safety in Coal Mines
基金
国家自然科学基金资助项目(51174141
51404167)
关键词
孤岛综放工作面
沿空掘巷
窄煤柱
数值模拟
采空区
isolated fully mechanized caving face
gob-side entry driving
narrow coal pillar
numerical simulation
goaf
