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Crashed failure mechanism & prevention of fractured high-steep slope
in the Three Gorges Reservoir，China

1 2 3 3 4 1
YIN Yueping ，WANG Luqi ，ZHAO Peng ，ZHANG Zhihua ，HUANG Bolin ，WANG Xuebing
（1. China Institute of Geological Environment Monitoring，Beijing 100081，China；
2. School of Civil Engineering，Chongqing University，Chongqing 400045，China；
3. Chongqing 208 Geological Environment Research Institute Co. Ltd，Chongqing 400700，China；
4. Hubei Key laboratory of Disaster Prevention and Mitigation，China Three Gorges University，Yichang 443002，China）

Abstract： This paper studies the damage evolution of the high-steep reservoir banks caused by the water
storage operation of the Three Gorges Project. It is prone to become unstable for the rocky bank located in
the canyon area with the dual geological structure of hard at the upper and soft at the lower layers. The
strength of the base rock mass in the fluctuation zone tend to decrease due to the deterioration. On the ba⁃
sis of on-site investigation and long-term monitoring，the damage constitutive models of base rock mass un⁃
der dry， saturated， and transition states were established. A quantitative evaluation method was proposed，
and the ratio of the peak stress to the effective stress of the fluctuation zone was used as the stability fac⁃
tor of the crashed failure. The application research of Jianchuandong dangerous rock mass in Wuxia Gorge
was carried out. The results showed that the stability evaluation method proposed in this paper could track
the evolution states of macro slump，deformation and nonlinear increase of base pressures. Compared to the
traditional limit equilibrium stability analysis method， this new method could reflect the process from dam⁃
age to collapse. As for the crashed failure of high-steep rocky bank，the reinforcement program of the base
rock mass was formulated. The related contents can provide guidance for the risk management of high-steep
rocky bank in the Three Gorges Reservoir Area.
Keywords：Three Gorges Reservoir；high-steep reservoir banks；damage evolution；crashed failure

（责任编辑：李 娜）

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