Mining-induced dynamic disasters caused by coal-rock mass destabilization in fault effect region are very common. Quantitative determination on the Ranging of Deeper Critical Destabilization (RDCD) of coal-rock mass is critically important for the supporting parameters optimization and mining safety. According to the safety mining idea in fault effect region of Tunbao Coal Mine, controlling parameters of coal-rock stability were confirmed by taking advantage of Hoek-Brown failure criterion theory, hence, the expression of RDCD was shown as R=k + a. In order to obtain the RDCD, a sight instrument was used to collect the optical information of hostrock around deep mining roadway, then the joint fractures' development characteristics and their distribution characteristics with depth could be predicted. So, based on the theoretical analysis and in-situ measurement, the RDCD in fault effect region was determinated, and the maximum RDCD reached 2.51 m. At last, an asymmetric supporting scheme was also proposed, which has been proved effective in roadway stability and safety.
In mining process, the faults will impact the layout of work plane and roadway, also, faults in the goaf influence stability of mining roadway. Along with the working face advance, stress concentration in front of the working face will aggravate the fault activation and migration, which may induce serious dynamic disasters. Wang Chuanying (Wang et al. 2010) proposed Rock Mass integrity Index (RMDI) method to describe rock mass integrity through borehole camera technology. Peng Suping and Meng Zhao ping (Peng et al. 2001, Men get al. 2001 & 2006) suggested that there are low stress area and high stress concentration zone in the fault and its surrounding zone. Kang Hongpu (Kang et al. 2010) used the borehole structure plane method to research the internal character of the coal and rock mass. Lai Xingping (Lai et al. 2008, Lai 2002) analyzed the damage and deformation of surrounding rock based on the monitoring data, and gave the reasonable supporting parameters. Li Shucai (Li et al. 2008) used the borehole TV camera to in-situ monitor the zonal disintegration phenomenon of surrounding rock mass and analyzed the relationship between zonal disintegration range and roadway radius.
