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| Investigation on dynamic response mechanism of slopes with serrated structural planes under degradation of rock mass in hydro-fluctuation belt |
| LIU Xinrong1，2，3，WANG Yan1，2，3，XU Bin1，2，3，ZHOU Xiaohan1，2，3，YI Li4，
HUANG Junhui5，WANG Zijuan6 |
| (1. School of Civil Engineering，Chongqing University，Chongqing 400045，China；2. National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas，Chongqing University，Chongqing 400045，China；3. Key Laboratory of New Technology for Construction of Cities in Mountain Area of the Ministry of Education，Chongqing University，Chongqing 400045，China；4. Chongqing Branch Office of Beijing Urban Construction Design and Development Group Co.，Ltd.，Chongqing 400147，China；5. Guangzhou Design Institute，Guangzhou，Guangdong 510620，China；6. School of
Management Science and Engineering，Chongqing Technology and Business University，Chongqing 400067，China) |
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Abstract The shaking table model test was used to investigate the dynamic response mechanism of slopes with serrated structural planes under multiple seismic loads and degradation of rock mass. The research shows that the dynamic response of slopes has“altitude effect”and“surface effect”，and the PGA amplification factor of slopes decreases steadily under continuous seismic loads. The slope cumulative displacement，soil pressure and pore water pressure around the hydro-fluctuation belt increase，decline，and increase respectively. The progressive failure evolution of slopes is characterized by micro fracture initiation and development，macro fracture propagation and the formation of macro composite slip surface. Residual damage traces of serrated structural planes with low，medium and high undulation are different，which are climbing，gnawing off after climbing and gnawing off respectively. The opening degree of prefabricated joints continuously increases under water erosion and seismic loads，the deterioration depth and width of rock mass also continuously increase，and a few split cavities are formed locally in hydro-fluctuation belt. In addition，the natural frequency and damping ratio of the slope keep increasing and decreasing respectively. The nonlinear cumulative damage mathematical model of slope rock mass was established and the evolution process of slope damage degree in the stages of micro earthquake and strong earthquake was described by“S-type”function and“upside concave type”function respectively.
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2022, Vol. 41 
