Abstract:

To analyze the action relation of rock mass structure and slope deformation, taking Badong county for example, the rock mass structures evolution under endogenic and exogenic geological process of main strata in the region is discussed. Then, the deformation characteristics of surface slope under the control of rock mass structure is analyzed. It is shown that the structure of rock mass is generated by endogenic geological process but rebuilt by exogenic geological process. Based on the scale of laminations, joints and cleavages generated by sedimentation and tectonic processes, the structures of rock mass are classified as layered structure, blocky structure and cataclastic structure. Rebuilding result of weathering and karst process is controlled by the initial structure of rock mass. The layered structure rock mass of T2b3 usually slides along the weak interlayer. However, the interbeded structure rock mass of T2b2 easily collapses because of the different disintegration of layers. The model and scale of blocks failure are controlled by the combination relations and size of discontinuities. The dense cleavages make rock mass cracked, which may bend when unloading. The obtained results will provide an importance reference to analyze and prevent slope hazards.

Key words: rock mass structure, slope deformation, tectonic process, exogenic geological process