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为解决大倾角煤层走向长壁开采过程中采场围岩中“关键域”非确定性和岩体结构变异问题.采用平面、三维立体相似模拟实验、数值分析、理论分析等综合研究方法,分析了沿工作面倾斜方向不同区域“关键域”转换和岩体结构平衡机制,结果表明:在覆岩“应力-冒落”双拱作用下,工作面下部“关键域”向直接顶和伪顶岩层转移,岩体结构破断方式为直接垮落,中部“关键域”处于基本顶中下位岩层中,岩体结构破断方式为一次回转垮落,上部“关键域”向基本顶上位岩层中转移,岩体结构破断方式为二次回转垮落,不同区域岩体结构破断的分区特征,导致了工作面来压的时序性和非均衡性.
In order to solve the problem of “critical field ” nondeterminacy and the variation of rock mass structure in the surrounding rock of stope with large dip angle in the process of longwall mining, a comprehensive research method such as plane, three-dimensional analogue simulation experiment, numerical analysis and theoretical analysis , The mechanism of “key domain” transformation and structural balance of rock mass along different directions along the working face is analyzed. The results show that under the action of double-arch with overlying strata, the lower part of the working face “To the direct top and the pseudo-top rock layer transfer, rock mass breakage for the direct collapse, the central ” key domain “in the basic top and bottom rock formations, rock mass structure broken way for a revolution collapse, the upper Key area ”to the top of the basic rock, rock mass structure broken way for the second turn of the collapse, rock mass structure in different regions of the regional characteristics of the fracture, leading to pressure on the face of the timing and non-equilibrium.