Research And Application On MS And Stress Characteristics In Fully Mechanized Caving Face In Yuncheng Coal Mine

Rock burst is uncertainty, the mechanism and conditions of complexity. Few studies on more information fusion of rock burst prevention and control, the paper proposed on the basis of the collection of information and practice on fully mechanized caving face 1300 in Yuncheng mining, the proposed MS monitoring technology and coal rockburst monitoring system, to carry out the following works:1. Using MS techniques to gently inclined thick seam mining of MS characteristics were studied to obtain the frequency energy and timing characteristics, spatial distribution and magnitude-frequency relationship:(1) During recovery, the number of MS events in more than 10 most of the day, and the energy released by an earthquake slightly smaller; the number of MS in time correspond to mine production, maintenance. (2) With the face forward, the distribution of MS events showing a clear zonation:area Ⅰ was 1300 mining affecting zone; area Ⅱ was about 300m ahead face; area Ⅲ was close to 1301 face (3) Through examples demonstrate the b-value impact occurred in the mine to significant differences occur before the rock burst.2. Using coal rockburst monitoring system for studing surrounding rock abutment pressure during recovery, and the stress characteristic of the period:(1) trend pressure on the range of advanced face 30.4～76m, about seven times the cutting height; abutment pressure peak position from the coal wall 13.2～22.8m, about three times the cutting height. (2) there were two abutment pressure:static and dynamic pressure bearing abutment pressure, static pressure peak position than supporting dynamic abutment pressure peak position farther from the coal wall.According to the actual situation, the mine rock mechanics, mine pressure theory and geophysical and MS equipment and coal rockburst monitoring equipment detected fusion, fracture characteristics and surrounding rock dimensional motion feature, the support pressure evolution to analyze the characteristics of scientific mining design, mining pressure control, bumping prevention and control to provide a scientific basis...