In-situ stress field inversion and its impact on mining-induced seismicity

The magnitude and direction of the in-situ stress field significantly influence the Geodynamic disaster. Taking the Gaojiapu Coal Mine in the northwest Binchang mining area as the study area, the distribution law of the in-situ stress field and its relationship with microseismic events were analyzed and discussed through field geological investigation, in-situ measurement, and numerical simulation. The results show that: (1) The Maximum horizontal principal stress (MaxHPS) is mainly concentrated in the turning end of the fold, the axis of the syncline, the undulation end of the anticline, the footwall of the fault, and the two ends of the fault. (2) The MaxHPS in the footwall area of the fault is greater than that in the hanging wall area. (3) The MaxHPS at the axial part of the syncline is greater than that at the wing part, and the MaxHPS at the wing part is greater than that at the anticline. (4) In areas with high MaxHPS and Lateral pressure coefficient (LPC), the frequency of high-energy microseismic events is high. (5) The 10(5)J high-energy microseismic events more easily occur in areas with MaxHPS greater than 38 MPa and LPC greater than 1.50.

Automated summary

The distribution of the in-situ stress field and its relationship with microseismic events were analyzed in the Gaojiapu Coal Mine. It was found that the maximum horizontal principal stress is concentrated in certain geological features such as folds, synclines, and fault footwalls. Areas with high maximum horizontal principal stress and lateral pressure coefficient show a higher frequency of high-energy microseismic events. The occurrence of 10(5)J high-energy microseismic events is more likely in areas with specific stress conditions.