综采工作面上覆岩层裂隙动态发育规律

以陕西某矿为试验矿井,采用现场试验、数值模拟研究了综采工作面回采过程中上覆岩层裂隙发育特征。研究结果表明,陕西某矿综采工作面冒落带和裂隙带发育高度分别为42.9,94.2 m;工作面回采前裂隙发育度低,工作面回采后,受采动影响裂隙发育度明显提高;工作面推进到某一位置前,裂隙数量及发育高度随着工作面的推进而不断增加,随着工作面继续推进,采空区被压实,裂隙数量降低,而在工作面边缘区域,裂隙数量一直处于高水平,整个裂隙发育曲线呈"波浪"型分布。

Fracture Development Law of Overlying Strata in Fully Mechanized Caving Mining

Taking a certain mine in Shanxi province as an experimental mine,the characteristics of overlying strata fissures in the mining process of fully mechanized mining face are numerically simulated and studied by field tests.The results show that the development height of caving zone and fissure zone in a fully mechanized mining face in Shanxi province is 42.9 m and 94.2 m respectively,and the development degree of crack before and after mining is obviously increased.Before the face is pushed to a certain position,the number of cracks and the height of development increase with the advance of the working face.As the face continues to advance,the goaf is compacted and the number of cracks is reduced.And in the edge area of the working face,the number of fractures has always been at a high level,and the whole fracture development curve is a“wave”type distribution.