浅埋两硬煤层综放面支承压力分布规律研究

Abutment Pressure Distribution Rule of Full-mechanized Caving Mining Face in Shallow Buried and Hard Coal-seam

为研究浅埋两硬煤层综放面支承压力的分布特征,用钻孔应力计对安家岭矿4102工作面回采巷道两侧煤体内的应力进行了实测。研究表明：浅埋两硬煤层综放面超前支承压力、后方支承压力及侧向支承压力的影响范围较大,超前支承压力峰值位置到煤壁以及侧方支承压力峰值点到煤柱侧帮的距离都较小（3~4m）,这是与普通煤层综放面超前支承压力峰值点前移及侧方支承压力峰值远离巷帮的规律不同之处,侧方支承压力峰值出现在工作面后方,在工作面采动影响稳定后,煤柱侧巷帮煤体内会出现明显的破碎垮落区、塑性区和弹性区。

In order to obtain abutment pressure distribution rule of full-mechanized caving mining in two-hard coal-seam,borehole stress meters were installed at two-side of mining roadway of 4102 mining face,Anjialing Colliery. Results showed that advanced,rear and side abutment pressure influence range were larger,and distance from advanced abutment pressure summit value to coal-wall,and distance from side abutment pressure summit value to coal-wall were smaller than those in common full-mechanized caving mining face. Side abutment pressure summit value occurred before mining face. When mining influence became stable,obvious cracked caving zone,plastic zone and elastic zone would occurred in sides coal-body of roadway beside coal-pillar.