LAUSR

As the mining depths increase, an increasing number of mines in China encounter a new type of integrated dynamic disaster of rockburst and water inrush, causing great casualties and economic losses. This occurs constantly due to lacking understanding of its occurrence mechanism. This study investigated the mechanism of rockburst and water inrush as a new type of integrated dynamic disaster that has occurred in several mining areas in China. Mechanism of rockburst and water inrush mutually induced was proposed. A theoretical formula for vertical stress and floor failure depth was established and the formula indicates that dynamic stress increase lead to the floor failure depth increase, meanwhile, the thickness of aquiclude decrease. Microseismic monitoring technology was used to examine the effect of dynamic stress induced by overlying strata movement on floor failure and the results showed that the depth of microseismic events in coal floor reached the maximum 28 m when the dynamic stress reached the maximum. The finite element method was used to verify the effect of dewatering on stress distribution and the displacement of surrounding rock, and the results indicated that dewatering leads to the formation of the overlying strata settlement, vertical stress decrease in the region above the area, and vertical stress increase in the boundary region of water-rich area.