Preventing Coal Bump By Appling Microseismic Locating Monitoring Technology In Longwall Face

Based on project of national science fund for international significant cooperation " the mechanism of disaster rupture of overlying strata in mines" , the paper studied on the dynamic monitoring and predicting-forecasting coal bump with high precision microseismic location monitoring technology in small area. (1) According to connection between engineering geology and engineering mechanics, the paper got combined dynamic and static judgment criterion of dividing possibility gradation of coal bump to occur. The criterion will be tested in the future.Based on the connection between rock cracked field and mining high pressure field, the explanation of the principle of forecasting mining tremor using MS monitoring instrument was obtained. By using high precision MS locating technology in small area to monitoring rock fracture, the paper tried to describe strata spatial movement and refuted stress field (space-time) transportation law:(1) The paper found the distinguish about waveform characteristic between MS event and interference event, and obtained how to identity MS event.(2) According to the 3D rock cracking location, conclusions can be obtained as follows: Key stratum can be classified according to the special attribution of the microseismic cracking events. The cracking of the primary key stratum, conglomerate ruptured caused by the exploitation of NO. 4 and NO. 6 coal seams. The cracking sites of conglomerate expand to the entity coal in incline direction and the cracking occurred from the below part in vertical direction. The sites of mining tremor behavior are not always the sites of the shock focus. Statistics results of observation indicated that shock bumps are caused by part of rupture of conglomerate, and about 50 percent of mining tremors occurred by the reason of the cracking of key stratums,. Few of them induced to mining tremor behavior.