ZHANG Yuyang, HUANG Runqiu, PEI Xiangjun, WEI Yufeng, WANG Zilong, WANG Gang, XIAO Huabo. 2017: DEFORMATION FAILURE MODE OF FRACTURED ROCK MASS SLOPE IN LENGGU HYDROPOWER STATION. JOURNAL OF ENGINEERING GEOLOGY, 25(2): 556-564. DOI: 10.13544/j.cnki.jeg.2017.02.036
    Citation: ZHANG Yuyang, HUANG Runqiu, PEI Xiangjun, WEI Yufeng, WANG Zilong, WANG Gang, XIAO Huabo. 2017: DEFORMATION FAILURE MODE OF FRACTURED ROCK MASS SLOPE IN LENGGU HYDROPOWER STATION. JOURNAL OF ENGINEERING GEOLOGY, 25(2): 556-564. DOI: 10.13544/j.cnki.jeg.2017.02.036

    DEFORMATION FAILURE MODE OF FRACTURED ROCK MASS SLOPE IN LENGGU HYDROPOWER STATION

    • Fractured rock mass slope is one of the most unstable slopes in geological engineering. It has flabby original rock structures, generally open structural planes and poor stability surrounding rocks. The fractured rock mass is exposed discontinuity and the spatial distribution is different. These characteristics lead to the boundary of slope failure is not obvious. It causes deformation and failure mechanism difficult to be determined. As an example of the fractured rock slope of the Lenggu Hydropower Station in the Yalong River, based on geological environment investigation and survey of adit, this paper systematically studies the fractured rock mass structure characteristics, analyzes the boundary conditions which controls the slope deformation and failure, and summarizes the slope deformation and failure modes. Moreover, the UDEC discrete element simulation is used to verify the modes. The results show that the deformation and failure of the rock slope is mainly controlled by rock slope structures and internal relative large structures. The deformation evolution process is divided into three stages: stress adjustment, aging deformation and local instability. The deformation failure modes include fault controlled bottom slip mode and fracture cutting failure mode. At present, there are few relatively studies on the fractured rock slope, lack of large-scale engineering case support. The research results provide reference for the study of this kind of slope in water conservancy project.
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