Analysis for floor heave and study on control countermeasures in deep roadway at Qishan coal mine

The characteristics of floor heaving are analyzed from five aspects, which include depth-dependent, asymmetry, regional, timeliness and sophisticated. The influencing factors of floor heave are discussed by the way of numerical simulation and theoretical analysis. The key factors mainly include gravitational force, tectonic stress, stratum structure, characteristic of rockmass, support design and construct technology, and so on. The control countermeasures are put forward, which are proved to be effective and successful through engineering practice.