Abstract:

The issue of stress concentration in coal mine deep mining is particularly serious, with the engineering example of working-face 1305 in Tangkou Mine, ground stress distribution laws of one kilometer-deep large mining-height stope were numerical analyzed by using FLAC3D. Simulation results have revealed that: As mining starts in working-face 1305, a “double-lunds” shape symmetrical abutment pressure affected zone has formed in the surrounding rocks; as working-face promoting, the peak of stope abutment pressure and overlying strata failure height of goaf gradually increases, and the change tends to stability behind working-face square, the maximum peak is about 72MPa and stress concentration factor is 3.0; Abutment pressure peak value inside the coal in the front of working face coal wall and beside the gob area transfers to the deep, and the influence scope of abutment pressure gradually increases, the distance between the pressure peak value and the coal wall of working face basically keep in the range of 8 to 15 m.

Key words: one kilometer-deep mine, large mining-height, abutment pressure, numerical analysis, stress concentration