摘要
为揭示特厚煤层综放工作面侧向支承压力演化机理,以塔山矿8206工作面为工程背景,通过相似材料试验、数值模拟及理论力学分析,建立采空区端部覆岩运动模型,对采空区稳定前后端部结构特征及侧向支承压力演化规律进行研究。结果表明:采空区稳定前低位关键层以悬臂梁结构存在,高位关键层形成砌体梁结构,侧向支承压力峰值达41.6 MPa,影响范围68 m;采空区稳定后,低位关键层悬臂梁结构破断,实体煤侧断裂贯通形成三角形滑移区,侧向支承压力峰值降低至32.09 MPa,但影响范围增加至99 m;悬臂梁破断后块体的稳定性主要取决于破断块体的高长比、破断角以及摩擦面之间的摩擦因数;三角形滑移区破断稳定后部分载荷转移至采空区是侧向支承压力降低的根本原因,但受稳定前高侧向支承压力的影响,煤体塑性区范围扩大,致使稳定后侧向支承压力影响范围增大。
In order to reveal the evolution mechanism of lateral abutment pressure at extra thick coal seam fully mechanized top coal caving face,taking Tashan coal mine 8206 working face as an engineering background,using the methods of similarity material test,numerical simulation and theoretical mechanical analysis,an end overburden motion model was established to study the features of end structure and the evolutional rule of lateral abutment pressure about goaf stability.Results show that before the goaf is stable the low key layer exists in the form of a cantilever beam structure and the high key layer exists in the form of masonry beam structure,and the peak value of lateral abutment pressure is 41.6 MPa,the range of influence is 68 m.After the goaf is stable,a triangular slip zone forms on the side of solid coal,and the peak value of lateral abutment pressure decreases to 32.09 MPa,although the range of influence increases to 99 m.The stability of blocks after the cantilever beam structure broke is mainly determined by height length proportion,broken angle and friction coefficient between the friction surfaces of broken blocks. And the root cause of the reduction of lateral abutment pressure is partial loads transferring to the goaf after the triangular slip zone stable,however,due to the effect of high abutment pressure before stability,it results in the influence scope of lateral abutment pressure increased after stability.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2017年第S1期30-35,共6页
Journal of China Coal Society
关键词
综放工作面
端部覆岩结构
三角形滑移区
侧向支承压力
演化机理
fully-mechanized top coal caving face
end cover rock structure
triangular slip region
lateral abutment pressure
evolution mechanism
