ANALYSIS OF CUT ROCK SLOPE FAILURE MODES WITH THICK SOFT-HARD INTER-BEDDINGS IN FULING COUNTY, CHONGQING

This paper is based on detailed field survey results about road slopes with thick soft-hard inter-beddings. It is found that the rock slopes with different bedding orientations and different excavation orientations would have different failure modes. According to many field examples, the paper summarized several failure modes with different bedding orientations. The modes of rock slope failures with gentle bedding dip angles have three types : sliding-falling、toppling and falling. The modes with middle bedding dip angles have two types : sliding and falling. The modes with high dip angle have two types: sliding-falling and falling. On the basis of force analyzing and deforming character analyzing, the paper gives engineering measures respectively. This shows that the slope deformation failure and geo-force mode is closely related with slope rockmass structures. Through studying the rockmass failure modes with different dip angles, it can evaluate slope stability systemically. On practicing, it can forecast potential geo-hazards according to different dip angle in cutting slope construction. Consequently, people can adopt suitable measures according to different failure modes.