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Volume 42 Issue 6
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JI En-yue, CHEN Sheng-shui, FU Zhong-zhi, ZHANG Can-hong. Simulation method for crest cracks in high earth core rockfill dams and its application[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(6): 997-1004. DOI: 10.11779/CJGE202006002
Citation: JI En-yue, CHEN Sheng-shui, FU Zhong-zhi, ZHANG Can-hong. Simulation method for crest cracks in high earth core rockfill dams and its application[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(6): 997-1004. DOI: 10.11779/CJGE202006002
shu

Simulation method for crest cracks in high earth core rockfill dams and its application

  • 1.

    Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China

  • 2.

    Key Laboratory of Earth-Rock Dam Failure Mechanism and Safety Control Techniques, Ministry of Water Resources, Nanjing 210029, China

  • 3.

    Nanjing Institute of Industry Technology, Nanjing 210046, China

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  • Received Date: September 16, 2019
  • Available Online: December 07, 2022
    Graphical Abstract
    • Abstract
  • The crest cracks are the common dangers during construction and operation of high earth core rockfill (ECRD) dams. The occurrence and propagation of the crack increases the safety risk of the project greatly. The simulation method for crest crack based on the displacement mode of the extended finite element method (XFEM) is put forward and introduced into the crack simulation of Pubugou ECRD. Firstly, the basic principle of the simulation method is introduced. Then, the measured data of typical monitoring points of Pubugou ECRD are inverted by using the neural network genetic algorithm. XFEM modelling of the 2-D model is conducted using the parameters obtained by inversion to reflect the wetting, rheological and consolidation of dam materials. The results show that the dam deformation is in good agreement with the monitoring data. The maximum settlement of the dam is 3.27 m after impoundment, the maximum upstream horizontal displacement is 1.17 m, and the maximum wetting settlement of upstream rockfill is 0.48 m. The wetting deformation and reservoir water pressure exert a certain dragging effect on the top of the dam, which directly leads to the crest cracks. The cracks at the top of the dam occur for the first time after full storage, 4.75 m away from the axis of the dam, and 1.75 m-deep cracks extend within one month (in the filling at dam top without extending to the core wall). The cracks on the top of the dam have not propagated substantially during 10 years of dam operation. The simulated results are close to the measured values.
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    • References (18)
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