浅埋厚煤层大采高工作面顶板岩层断裂演化规律的模拟研究

根据神东矿区上湾矿1 - 2 煤层的赋存条件，运用1∶50的大比例相似模拟试验，研究了 5.5 m 大采高综采工作面顶板垮落特征、顶板断裂位置及顶板垮落带和裂缝带“两带”高度等。研究结果表明：① 直接顶岩层分层垮落形成松散块体，难以充满采空区；② 由于一次采出的煤层厚度大幅度增加，原有直接顶远不能充填满采空区，基本顶的下位岩层分层垮落后，不能形成铰结结构，采高的增大使得直接顶的范围变大；③ 周期来压前，顶板的断裂位置一般超前工作面 7.65 m ；④ 顶板垮落带和裂缝带“两带”的高度呈现台阶式上升。

Study on simulation of caving and evolution law of roof strata of large mining height workface in shallow thick coal seam

Based on the condition of No.1-2 coal seam of Shendong minging area Shangwan Coal Mine,the caving characteristics,the fracture position and caving zone and fracture zone "two belts"height of the 5.5 m large mining height workface’s roof were studied by similar simulation test,with geometric similarity ratio 1∶50.The results show that the immediate roof caves stratified to loose blocks,and the goaf can not be full of these loose blocks;because of the increasing of mining height at one time,and the original immediate roof is far from full of goaf,the lower basic roof can not form hinge structure after it collapse,and the increasing of mining height evolves into the increasing of immidiate roof;before periodic weighting,fracture position of roof usually advance beyond working face 7.65 m;the height of two belts presents step increasing.