Analysis on roof strata weighting of longwall coal mining face affected to pressure bump occurred

In order to fully understand an interaction relationship between mine roof strata weighting and pressure bump occurred in longwall coal mining face, the paper analyzed weighting affected to the dynamic loading of mine coal mining face and certain cases of pressure bump occurred by mine roof strata weighting and the paper provided prevention and control measures of the mine roof pressure bump caused by the mine roof strata weighting. The study results showed that the mine roof strata weighting of the longwall coal mining face would have obvious influences to pressure bump and electromagnet radiation monitoring and measuring showed that b efore, the mine roof strata weighting occurred, the static stress within the seam would be steadily increased. Meanwhile, when the mine roof strata weighting occurred b y the micro seismic, the high level rock stratum would start to be moved, high energy dynamic load would be occurred, the high energy value released from the dynamic load and the high stress occurred would easily make sudden failure of the surrounding rock near seam and thus pressure bump would be occurred. The mine roof strata pressure bump would generally be occurred after 1 ~ 2 days of the mine roof strata weighting occurred. Therefore mine strata pressure bump was defined as a mine ind uced roof pressure bump. According to the type roof strata pressure bump, the time of roof strata weighting occurred should be accurately judged. Before mine roof stra ta weighting occurred or during the pressure bump period, the effective pressure released and danger control measures and the effect detection method could be condu cted and could highly improve the control of the pressure bump, to reduce damager, could ensure safety production of coal mining face.