(1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu，Sichuan 610059，China；2. Sichuan Shutong Survey and Foundation Engineering Co.，Ltd.，Chengdu，Sichuan 610081，China)
Abstract：Madaling landslide is a typical mining induced landslide，of which the natural slope is a gently counter- inclined layered structure. In this paper，the physical modeling method was used to study the deformation process of the mining slope under the two layer mining condition and the geomechanical mode of the slope deformation was analyzed. After the coal mining，the stress concentration occurs in the overlying rock of goaf boundary leading to rock cracking initially mainly in the vertical direction. The mining fissures expand to the centre of goaf and gradually form the abscission fissures and shear fissures. After the deformation becomes stable，the overlying rock strata of goaf were bended to form a subsidence area on the surface. Due to the pushing of goaf overburden subsidence，the outer slope slides along the coal seam resulting in the uplift of the lower part of the slope. The geo-mechanical model of this kind slope deformation and failure can be divided into the bending-tensile (“supergene” transformation stage)，plastic flow-tensile and creep-tensile three stages.
2016, Vol. 35 
