Rock and Soil Mechanics ›› 2023, Vol. 44 ›› Issue (3): 637-648.doi: 10.16285/j.rsm.2022.0338

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Investigation on dynamic cumulative damage mechanism of the dangerous rock slope including deteriorated rock mass in hydro-fluctuation belt

LIU Xin-rong1, 2, 3, GUO Xue-yan1, 2, 3, XU Bin1, 2, 3, 4, ZHOU Xiao-han1, 2, 3, ZENG Xi1, 2, 3, XIE Ying-kun5, WANG Yan1, 2, 3   

  1. 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. School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 5. Chongqing Chuandongnan Survey & Design Institute Co., Ltd., Chongqing 400038, China
  • Received:2022-03-21 Accepted:2022-06-24 Online:2023-03-21 Published:2023-03-23
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41972266), the Postdoctoral Science Foundation of Chongqing Jiaotong University (22JDKJC-A008), the Graduate Scientific Research and Innovation Foundation of Chongqing, China (CYS21024, CYS21029) and the Basic Research and Frontier Exploration Project of Chongqing in 2018 (cstc2018jcyjAX0453).

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Abstract: The shaking table model test with a geometric similarity ratio of 1:100 was constructed to investigate the stability of the typical dangerous rock slope in the Three Gorges Reservoir area under the influence of rock mass deterioration and reservoir-induced earthquakes. The whole process of dynamic cumulative damage, instability failure, and the response law of the dangerous rock slope including deteriorated rock mass in the hydro-fluctuation belt were discussed. The results demonstrated that the whole process can be described as the cumulative damage in the slope → the cracks development → the penetration of secondary joints and deep large cracks → the instability toppling. At the same time, the rock mass on the surface of the hydro-fluctuation belt begins to loosen and fall, resulting in the formation of a seepage network, seepage channels, and cavities within the slope. As ground motion continues, the dynamic response of the dangerous rock mass exhibits a typical "elevation effect" and “surface effect”. The cumulative displacement on the dangerous rock slope surface increases continuously, while the pore water pressure within the hydro-fluctuation belt increases overall. The horizontal and vertical earth pressure of the dangerous rock slope initially increase and then decrease, and the natural frequency and the damping ratio of slope decrease and increase, respectively, throughout the entire stage. Before the end of the small earthquake stages and at the strong earthquake stages, the damage degree curve of the dangerous rock slope follows an "S" type distribution and an exponential distribution.

Key words: dangerous rock slope, shaking table model test, deteriorated rock mass in hydro-fluctuation belt, dynamic response law, cumulative damage mechanism

CLC Number: 

  • TU432
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