Quantitative analysis of rockburst risk based on the source parameters and regional stress for microseismic events

In order to achieve quantitative analysis of rockburst risk in coal mine, multi-source information needs to be deeply mined based on microseismic monitoring. In accordance with the microseismic data collected from the 1366 working face of the Hengda Coal Mine, the precise source location is determined, the evolution law of the source parameters is analyzed, and the stress concentration regions are determined based on the seismic wave computed tomography (CT) technology. Based on this, the reasonable and effective measures of stress relief are put forward. The results show that: (1) the precise source location of microseismic events in the working face is determined based on the combined location method of simplex and double difference. The root-mean-square residual decreases significantly after relocation, from 1.86 to 0.83 s; (2) based on the precise source location, microseismic source parameters such as energy, stress drop, apparent stress, and mean slip are retrieved, and to determine the source properties of a microseismic event, such as energy size and stress state; (3) based on the seismic wave CT, the stress distribution in different regions is obtained, and the regions of stress concentration are determined. The stress concentration areas of 1366 working face are mainly concentrated in the side of the transport trough; (4) according to the energy and stress distribution of microseismic events, the dangerous area of the working face is accurately judged. The risk areas of 1366 working face are mainly concentrated in the side of the transport trough. The reasonable and effective measures of stress relief are proposed. Based on the in-depth analysis of multi-source microseismic information in 1366 working face of Hengda Coal Mine, the rockburst risk is quantitatively assessed and the safety of coal mine operation process is ensured.