The numeric simulations of water-bursting time-effect for faults in Zhaogezhuang Coal Mine, Kailuan, China

In the light of safe mining evaluations for the first mining district which is cut by fault F 8 in the thirteenth mining level in Zhaogezhuang Coal Mine, Kailuan, this paper adopts such methodology as measured ground stress, traditional and special rheological rock mechanics experiments, and three dimensional visual numeric modeling using FLAC 3D and discusses deeply their weak effect mechanisms for fanlt F 8, controlling factors, and presents a new concept of the time weak effect of fault materials under coal bed. The concept develops and enriches basic theory of water bursting in coal mine. In the last, different safe mining schemes for the first mining district at the thirteenth level in Zhaogezhuang Mine have been predicted and evaluated.