›› 2018, Vol. 39 ›› Issue (8): 3055-3060.doi: 10.16285/j.rsm.2016.2572

• Numerical Analysis • Previous Articles     Next Articles

Study on hydraulic fracture of gravity dam using the numerical manifold method

YANG Shi-kou1, REN Xu-hua2, ZHANG Ji-xun2   

  1. 1. College of Mechanics and Materials, Hohai University, Nanjing, Jiangsu 211100, China; 2. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China
  • Received:2016-11-03 Online:2018-08-11 Published:2018-09-02
  • Supported by:

    This work was supported by the National Natural Science Foundation of China(51739006) and the China Postdoctoral Science Foundation (2017M611678).

Abstract: The hydraulic fracture of the gravity dam was analysed by considering the advantages of the numerical manifold method in the non-continuum field and the basic principle of fracture mechanics. Besides, this study realised the whole process of dam crack initiation, propagation and progressive failure. With the respective advantages of the Mohr-Coulomb failure criterion with tensile strength and the stress intensity factor discriminant criterion, the fracture and its propagating direction were determined according to different conditions, and no pre-notched model was required. One example under two different conditions was selected to analyse the hydraulic fracture of the gravity dam with or without considering the inner water pressure on crack. The results showed that for the hydraulic fracture of gravity dam without considering inner water pressure on crack, the crack of dam site propagated toward the direction of downstream and depth, and the crack propagation at the upstream slope belonged to the compression-shear failure. However, when considering the inner water pressure on crack, the crack of the dam site was extended in the direction of depth, and the crack propagation of slope point belonged to the tension-shear failure. Furthermore, the required time steps for the dam failure were reduced, resulting in the decrease of the safety factor of the dam. This study has deepened the understanding of hydraulic fracture of the gravity dam and has great practical application value.

Key words: gravity dam, hydraulic fracture, numerical manifold method, stress intensity factor, Mohr-Coulomb failure criterion

CLC Number: 

  • TV 313

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