Abstract：Over the past six years after“5•12”Wenchuan earthquake，we have carried out engineering geological surveying，acoustic detection，coring-drilling，electron microscope scanning and other works to the Daguangbao landslide，which is the largest landslide induced by Wenchuan earthquake. Studies showed that the sliding zone of this landslide occurred in dolomite intraformational disturbed zone which was located in the third section of Denying group of Sinian system(Zd3). Comprehensive studies reveal the macroscopic characteristics of the fragmentation rock of slide bed as follows：the rock presents sandy soil within the 0–1 m depth below sliding surface，which the sand content occupy more than 60%；1m below the sliding surface，the average rock acoustic velocity is range in 2 500–3 000 m/s，in addition the integrity index of the rock tends to 0.15–0.77. On the whole，the damage degree of the rock mass generally decrease with the depth increase of slip bed，but under the same depth those increase with the elevation increasing，except the local difference broken. On the other hand，microscopic study reveals that the compression-shear crystal of rock mass of slip zone is fold and torsional fracture with lots of transgranular crack，which shows parts crystal loose and intergranular connection loss. Study reveals the significance of engineering geology as follows：(1) Property of the rock mass in sliding zone mainly controlled by argillaceous graniphyric dolomite of intraformational extrusion dislocation，which the composition of this layer is complicate with the high degree of weathering，joint development and poor integrity；(2) Under “5•12”Wenchuan earthquake，the rock mass of slide zone generated strong shear failure (tensile and compressive shear failure) and wing crack extend，which caused sharp drop of the rock shear strength index and the integrity coefficient，thus deterioration of the rock mass. Furthermore，the rolling and rubbing action of thick sliding body afther starting further promote frictional resistance reducing in the sliding zone rock mass. In summary，the fragmentation of rock mass damage of Daguangbao sliding zone is a dynamicly progressive evolution process of rock internal defects under seismic load，the lithology and rock structural characteristics of slide zone are the main intrinsic factors，earthquake loads are its key external incentives.
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2015, Vol. 34 
