| Popis: |
In deep mining, the surrounding rock of the roadway is subjected to high static load. Under the support of high-level stress in the local complex geological structure area, the disturbance effect caused by small dynamic load can induce the rock burst of the roadway. Different energy level shock bump waves have different disturbance effects on the roadway, which can induce different degrees of damage in different positions of the surrounding rock of the roadway. Aiming at the problem of frequent rock burst in the main roadway of the first area of Gaojiapu Coal Mine in Binchang Mining Area, based on the analysis of the energycharacteristics of the roadway impact micro-seismic monitoring, the numerical simulation study was carried out. The stress, energy and displacement were used to characterize the disturbance effect of different energy level shock bump waves on the surrounding rock of the roadway. The results show that before the occurrence of rock burst, there are occasional large energy events in micro-seismic monitoring, but the total frequency and total energy are at a low level in the rest of the time, and the total energy is often less than 105 J. When the rock burst occurs, the total frequency and total energy of micro-seismic monitoring increase sharply, and the total energy reaches more than 105 J. After the rock burst occurs, the total energy and total frequency of micro-seismic monitoring decrease sharply, and they are in a silent state for a period of time. Under the condition of static load, the phenomenon of floor separation is more significant than that of roof separation. Under the disturbance of shock bump , the roof is more prone to separation than the floor. Under the disturbance of mine earthquake with 105 J and below, the influence on the surrounding rock of roadway is roof > floor > two sides. Under the disturbance of shock bump with 105 J and above, the influence on the surrounding rock of roadway is roof > two sides > floor. |
