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Volume 41 Issue 3
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KONG Xian-jing, PANG Rui, XU Bin, ZHOU Yang, ZOU De-gao. Stochastic seismic stability analysis of dam slopes considering softening of rockfills[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(3): 414-421. DOI: 10.11779/CJGE201903002
Citation: KONG Xian-jing, PANG Rui, XU Bin, ZHOU Yang, ZOU De-gao. Stochastic seismic stability analysis of dam slopes considering softening of rockfills[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(3): 414-421. DOI: 10.11779/CJGE201903002
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Stochastic seismic stability analysis of dam slopes considering softening of rockfills

  • 1. School of Hydraulic Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China;
    2. The State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China

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  • Received Date: February 01, 2018
  • Published Date: March 24, 2019
    Graphical Abstract
    • Abstract
  • The rockfills of earth-rockfill dams gradually show softening characteristics subjected to earthquakes, especially strong ones, which will affect the safety of dam slopes. In order to evaluate the effect of rockfill softening on the stability of dam slopes, a probability analysis method of dam slope safety based on the equivalent extreme-value distribution and probability density evolution method is proposed considering the stochastic earthquake excitation and different earthquake levels. A 242-m CFRD is used to perform stochastic dynamic response analysis and probabilistic reliability analysis based on three physical parameters of dam slope stability, the minimum safety factor, cumulative time of safety factor (Fs)<1.0 and cumulative slippage. The results show that the difference between considering softening and without considering softening gradually increases with the increase of earthquake intensity, and the attributes to the softening characteristics of rockfills are gradually revealed during the earthquake. Meanwhile, the softening is a gradual process. Hence, it is of great significance to analyze the seismic performance of the high earth-rockfill dams considering softening of rockfills. Moreover, it is unreasonable to study the stability of earth-rockfill dams only from the point of the minimum safety factor, and it is necessary to combine the cumulative time of Fs<1.0 and cumulative slippage to fully evaluate the safety of dam slope. The proposed stochastic probabilistic analysis method can give a more accurate evaluation of the reliability of high earth-rockfill dam slopes.
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    • References (21)
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