Abstract
With the development of mining to the deep, the ground stress increases correspondingly, and the geological conditions become more and more complicated. Mine dynamic disasters mainly occur near faults. Numerous studies have been conducted on single faults, but few studies have been done on stepped faults formed by double faults under complex geological conditions. Based on this, with the 3110-working face of Zhong Tai Mining in He bi as the engineering background, Single fault model a and different step fault models b, c, d, e and f were established by Flac3D numerical simulation software. The characteristics of stress field evolution of single fault and step fault under the influence of deep mining are studied. The results show that the stress distribution in the upper wall of the fault forms a stress concentration zone, and in the lower wall forms a stress weakening zone. Under the influence of excavation disturbance, the vertical fault distance and the horizontal distance between faults will affect the stress evolution characteristics of the stepped fault.
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