<正>Numerical simulation-FLAC~(3D) and equivalent material simulation were carried out to analyze the damaged patterns and lows, distribution of plastic width o
<正> Based on five basic assumptions, using theoretical analysis method, the natureof the ground subsidence and collapse was revealed from the mechanics point.D
<正> According to the mining mechanisms of CBM combined with coal structure andthe key technologies of coordinated mining coal and coalbed methane under differe