Abstract: The limit equilibrium stability analysis is the major design methodology for the supporting system for the high cut slopes in Chenzhou area. This analytical approach ignores many observed coal mine soft rock instability phenomena, such as, progressive failure, nonhomogeneous & heterogeneous in rock properties, noncontinuous as well as time related rheology. Under the action of rheology, the cut slope might result in a local instable and then progressive revolute into a global failure without a prominent slip surface been developed. When the time related creep movement reaches a threshold value, the local slope failure and even global landslide might occur. For the stability analysis work of access road slope in the soft rock coal mines, in addition to the creep characteristics of overburden soil, the rheologic properties of the soft rock mass soil also be considered. Based on a literature review of the stability analysis considering the rheology, this paper presents the stability analysis results of highway section between K2+700 and K2+800. Both the limit equilibrium and the rheology approaches are used and the Burgers model that considering the longterm strength was used in the analysis.

Key words: Coal Mine Strata, Rheology Property, Chenzhou Area