ABSTRACT
Recently years, According to large mining height work face, mechanism of coal wall caving and threezone of overlying strata and roof structure are studied by the scholars. Ning Yu (2009) considered that
(2010) structured structural mechanics model with transmission rock theory, and studied the movement law of overlying strata and the method of calculating support load. Chai Jing, Gao Deng-yan, Wang Guo-wang, et al. (2009) studied law of strata pressure behavior about large high mining of 360 m long working face. It shows that non-uniform big and small size periodicity variation, there are characteristic of large drawing pace of strata pressure and large dynamic load coefficient. Gao Bao-bin, Gao Allison, Yuan Dong-sheng (2013) analyzed the crack law of overburden rock of large high mining according to UDEC simulation about Li YaZhuang coal mine. At present, the study focused on the determination of critical index of overburden rock breaking large mining, while there is rarely report of overlying strata movement in mining process of evolution law and catastrophic destruction after it’s instability.
