Abstract: The slope stability (landslide) related geohazards are frequently encountered in the projects in the development of the Chenzhou area. One of the most frequently occurred instabilities in the project developments occurred in soil slopes with coal mine lens. The soil slopes with coal mine lenses have the characteristics of unevenly distributed stiffness among different strata; poor cementation between different soil layers, loose in density; prone to slaking in the ambient air and water; unstable properties in strength and in the fabrics. This paper summarizes the experience grain from the stability evaluation projects in soil slopes with coal mine lenses. The failure modes of the coal mine lens slopes and their influence factors are also presented in the paper. A landslide mitigation project at Tongxinqiao is presented in the paper. The optimized scheme is focused on the "prevention" of the instability in additional to the "remediation".

Key words: Coal Mine Strata, Stability Evaluations, Chenzhou Area