Classification, prediction, prevention and control of roof movement type mine earthquakes and induced disasters in China’s coal mines

In view of the current situation of frequent occurrence of roof movement type mine earthquake and disasters induced in coal mines, the occurrence mechanism, prediction and engineering classification technology of roof movement type mine earthquake and disasters induced were studied by means of field investigation, theoretical analysis and field monitoring. The following main conclusions were obtained:① based on the motion mode of key strata, the roof movement type mine earthquakes were divided into three types: key strata fracture type, key strata back transition type and key strata sliding type. The energy prediction model of roof movement type mine earthquake based on the motion state of key strata was established, and the energy calculation methods of three types of roof movement type mine earthquakes were proposed respectively.②Based on the mechanism of underground and ground disasters induced by roof movement type mine earthquake, an integrated mechanical model and evaluation method of underground rockburst and ground building vibration damage were established, which provided a basis for the prediction of coal mining type mine earthquake induced disasters. ③ The concept of collaborative prevention and control on roof movement type mine earthquake using classified prevention and control, source damping, energy absorption and anti seismic was put forward, and the prevention and control system of roof movement type mine earthquake and induced disasters based on low seismic energy, low surrounding rock density and high seismic capacity was formed. The test research on the prevention and control of roof movement type mine earthquake by surface vertical borehole fracturing source was carried out.④ According to the mine pressure behavior during the mining of the working face in the fracturing area and the results of similar material simulation, the large scale fracturing measures can reduce the occurrence frequency of large energy mine earthquakes, but it may also change the movement mode of key strata, and even increase the underground mine pressure behavior intensity.