Aiming at the damage and failure law of floor under mining disturbance in No.22210 Face of Zhenchengdi Mine, theoretical analysis, numerical simulation and field monitoring were comprehensively used to carry out research. Based on the theory of in-situ stress field reconstruction, the distribution equation of floor stress field and the prediction model of damage depth under mining disturbance were derived. The maximum damage depth was calculated to be 18.9 m. The numerical simulation results showed that the base damage was characterized by shear failure evolution during the advancing process of working face, and the maximum damage depth was 19.8 m. The monitoring results of hydraulic fracturing test showed that the maximum damage depth of floor was 18.4 m, and the error with numerical simulation results was less than 7.1 %. The existing roadway with a vertical spacing of 30 m in the working face is outside the damage influence range, which verifies the effectiveness of the stability control of the mining floor. The proposed analytical method of the damage critical depth based on the slip line field theory improves the engineering applicability of the traditional plane strain hypothesis.
郭 志. 煤矿工作面开采扰动下底板损伤规律及稳定性研究[J]. 煤炭与化工, 2026, 49(9): 30-36.
Guo Zhi. Study on floor damage law and stability under mining disturbance of coal face. CCI, 2026, 49(9): 30-36.
