ccording to the degree of deformation, the strataoverlying the mined out coal seam may be divided intocaved. fractured and bended zones and the surface soilzone.

• 煤层开挖后，将上覆岩体分成冒落带、裂隙带、弯曲带及表土层四个区域，可认为各区域是均匀的各向同性的线弹性介质。