Fault impact ground pressure is one sort of dynamic phenomena of fault relatively disturbed and elasticity strain energy rapidly released caused by exploitation. In order to investigate the mechanism of deep roadway fault impact ground pressure, based on the impact ground problem of Laohutai coal mine, numerical study on deep roadway fault impact ground pressure problem were carned out. The effects of the change of fault stress and strain during cut process on roadway in distribution excavation were simulated. The numerical results show that deep rock underground ison the state of nature stress before mining, however the nature stress state is destroyed after excavation, which results in the stress redistribution in roadway. It is possible to cuase the stress concentration of surrounding rock.. The stress at fault increases with the enlargement of excavation range underground. With the concentration of stress, when the coal mine amounts to the limit intensity the elasticity energy accumulated is released by ejection. As a result, fault impact ground pressure is arisen. Finally, forecast and prevention measures on fault impact ground pressure is put forward through the mechanism and characteristic study on Laohutai mine fault impact ground pressure.
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