中国矿山工程

The hydraulic fracturing method was used to conduct in-situ stress testing at a certain mine. Based on the measured data, the relationship between the magnitude of the in-situ stress and depth was analyzed, and the distribution law and variation characteristics of in-situ stress in the mine were obtained. The FLAC finite difference software was used to perform inversion simulation on the mining area, and the simulation results were used to verify the accuracy of the in-situ stress measurement results. The in-situ stress measurement results showed that the in-situ stress in the mining area was mainly composed of horizontal structural stress, with an average maximum horizontal principal stress direction of N 62.6°E. The maximum and minimum horizontal principal stresses and the vertical stress in the mining area all increased with depth. The average ratio of the maximum horizontal principal stress to the vertical stress was 2.42, and the average ratio of the minimum horizontal principal stress to the vertical stress was 1.49. The numerical simulation results showed that the maximum error between the inverted value of in-situ stress at the hole bottom monitoring point and the measured value was -13.9% of the maximum horizontal principal stress. The error was within a reasonable range, which verified the accuracy of the in-situ measurement data and the reliability of the inversion simulation, providing a data basis for subsequent work at the mine.