Abnormal Mine Pressure Behavior and Control Technology of Fully Mechanized Top Coal Caving Mining Face in Suancigou Mine

According to the serious mine pressure behaviors in the high cutting fully mechanized top coal caving mining face in No.6 Up seam of Suancigou Mine, a real time online monitoring and measuring and analysis was conducted on the mine pressure behaviors of the coal mining face.The results showed that the periodical pr essure step distance of the coal mining face was 20.2 m, the average pressure dynamic coefficient was 1.35 and high pressure zone was concentrated on No.20 to No. 130 hydraulic powered supports.The daily max working resistance of the 98% powered supports would reach or be over the rated working resistance of 15 000 kN.Ther e was a powered support jammed accident occurred at the initial mining period of the coal mining face.According to above problems, the measures of the safety valve 0 pen value increased, advancing speeded up, less top coal caving during the pressure period, deep pressure releasing blasting and others were applied to control the ro of pressure behavior strength.The monitoring and measuring showed that open and start rate of the safety valve was reduced to 12.4%.The working resistance of the p owered supports basically could meet the normal percentage distribution and could improve the safety production level of the coal mining face.