Journal article
Numerical Modeling of Earthquake-Induced Landslide Using an Improved Discontinuous Deformation Analysis Considering Dynamic Friction Degradation of Joints
Rock mechanics and rock engineering, Vol.49, pp.4767-4786
12/2016
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Abstract
Discontinuous deformation analysis (DDA) as an efficient technique has been extensively applied in the dynamic simulation of discontinuous rock mass. In the original DDA (ODDA), the Mohr-Coulomb failure criterion is employed as the judgment principle of failure between contact blocks, and the friction coefficient is assumed to be constant in the whole calculation process. However, it has been confirmed by a host of shear tests that the dynamic friction of rock joints degrades. Therefore, the friction coefficient should be gradually reduced during the numerical simulation of an earthquake-induced rockslide. In this paper, based on the experimental results of cyclic shear tests on limestone joints, exponential regression formulas are fitted for dynamic friction degradation, which is a function of the relative velocity, the amplitude of cyclic shear displacement and the number of its cycles between blocks with an edge-to-edge contact. Then, an improved DDA (IDDA) is developed by implementing the fitting regression formulas and a modified removing technique of joint cohesion, in which the cohesion is removed once the 'sliding' or 'open' state between blocks appears for the first time, into the ODDA. The IDDA is first validated by comparing with the theoretical solutions of the kinematic behaviors of a sliding block on an inclined plane under dynamic loading. Then, the program is applied to model the Donghekou landslide triggered by the 2008 Wenchuan earthquake in China. The simulation results demonstrate that the dynamic friction degradation of joints has great influences on the runout and velocity of sliding mass. Moreover, the friction coefficient possesses higher impact than the cohesion of joints on the kinematic behaviors of the sliding mass.
Details
- Title
- Numerical Modeling of Earthquake-Induced Landslide Using an Improved Discontinuous Deformation Analysis Considering Dynamic Friction Degradation of Joints
- Creators
- Da Huang - Chongqing UniversityYixiang Song - Chongqing UniversityDuofeng Cen - Chongqing UniversityGuoyang Fu - RMIT University
- Publication Details
- Rock mechanics and rock engineering, Vol.49, pp.4767-4786
- Publisher
- Springer Nature
- Number of pages
- 20
- Grant note
- CYB14018 / Chongqing Graduate Student Research Innovation Project 41472245 / National Natural Science Foundation of China; National Natural Science Foundation of China (NSFC) 106112016CDJZR208804 / Fundamental Research Funds for the Central Universities 2011DA105287-MS201502 / Scientific Research Foundation of State Key Lab. of Coal Mine Disaster Dynamics and Control
- Identifiers
- 991013125994102368
- Copyright
- (c) Springer-Verlag Wien 2016.
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article