Experiment Study of Burst Tendency of Coal and Rock Layers at Tangkou Coal Mine

Under the depth of 1 000 m,the burst tendency is more apparent with the increasing of stress.According to the actual production situation of Tangkou mine,the probability and dangerous degree of pressure burst is researched in the first mine area.The results show the coal and rock layers have the ability of abruptly broken and quickly releasing large elastic deformation energy,the No.3U coal seam has the strong burst tendency and the roof of No.3U coal seam has the weak burst tendency.The necessary condition for the occurrence of pressure burst is the rock and coal layers with the burst tendency.At the same time,whether the burst of coal and rock layers happen or not,which relate to the depth of exploitation,the way of coal mining and the state of stress.The results also provide technical support for the prevention of coal bumping tendency,and have an important meaning for the direction of the control of the pressure burst.