Numerical simulation and field test of height of caving zone and fracture zone in Heshan Coal Mine

Abstract

In order to explore the distribution rules of caving zone and water conducted zone of lower layer coal under the influence of mining on upper layer coal, based on theoretical analysis, distribution rules of floor fracture zone of upper coal layer and caving zone and fracture zone of overlying rock of lower coal layer with various of layer spacing have been simulated. Taking actual working face as background, the height of caving zone and fracture zone of overlying rock have been measured by using double-ended water stopper. The results show that the height of the caving zone of No.9+10 coal is 10.6 m, and the height of the fracture zone is 45.79 m. The mining of the upper coal seam has a certain influence on the development height of the fracture zone of the lower coal seam, and there is a negative correlation trend. The fracture zone of the upper and lower coal seams may be connected.

Keywords

• udec simulation
• coal seam group
• overburden strata movement
• caving zone
• water conducted zone
• field test