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根据东峰煤矿3G02综放工作面沿空留巷300 m段内矿压数据的观测,分析沿空留巷围岩变形规律。得出如下结果:(1)巷道变形以顶底板移近量为主,其中顶板下降为主要变形量,两帮变形以煤帮鼓出为主;(2)整体上现有煤帮和墙体锚杆锚栓的支护强度可以满足要求,局部范围有破坏,顶板锚索受力普遍偏大,特别是充填区域,需要加强支护;(3)3G02工作面4~5个周期来压步距形成一个充分垮落循环,覆岩充分破断,冒落矸石对上位岩层形成支撑,上位岩层达到平衡状态,留巷达到稳定;(4)通过围岩收敛变形、顶板锚索受力、锚杆锚栓受力和墙体压力等矿压数据可以看出,顶板岩层剧烈运动范围很大,正常地段为滞后工作面40~100 m,特殊地段约为滞后工作面120 m。
According to the observation of the mine pressure data in the gob-side entry retaining gateway of 3G02 fully mechanized caving mining face in Dongfeng Coal Mine, the deformation law of surrounding rock of gob-side entry retaining retainingor is analyzed. The main results are as follows: (1) The deformation of roadway is dominated by the amount of roof and floor movements, of which the roof deforms as the main deformation and the two gangs are dominated by the coal gangue. (2) Anchor bolt bolt support intensity to meet the requirements of the local range of damage, the roof anchor force generally larger, especially in the filling area, the need to strengthen the support; (3) 3G02 face 4-5 cycles to step The formation of a full collapse of the loop, the rock completely broken, took the gangue rock formation of the upper support formation, the upper reaches of the rock strata equilibrium, stay alley to achieve stability; (4) through the convergence of deformation of the surrounding rock, roof anchor force, anchor Anchor bolt force and wall pressure can be seen from the rock pressure data, the roof strata strenuous range of motion, the normal section of lag 40 ~ 100m, special section of lag about 120m.