Vol17 No.7: 1581-1595
【Title】Landslide dynamic process and parameter sensitivity analysis by discrete element method: the case of Turnoff Creek rock avalanche
【Author】AN Hui-cong1,3; OUYANG Chao-jun1,2,3*; ZHAO Chuan4; ZHAO Wei1,3
【Addresses】1 Key Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China; 2 CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China; 3 University of Chinese Academy of Sciences, Beijing 100049, China; 4 Sichuan Academy of Water Conservancy, Chengdu 610072, China
【Corresponding author】OUYANG Chao-jun
【Citation】An HC, Ouyang CJ, Zhao C, et al (2020) Landslide dynamic process and parameter sensitivity analysis by discrete element method: the case of Turnoff Creek rock avalanche. Journal of Mountain Science 17(7). https://doi.org/10.1007/s11629-020-5993-7
【Abstract】The great diversity and complexity of geological hazards in terms of ﬂowing materials, environment, triggering mechanisms and physical processes during the ﬂow bring great difficulties to the numerical parameter selection for the discrete element method. In order to identity the significance of individual parameters on the landslides dynamic process and provide valuable contribution to the runout analysis of similar landslide, the dynamic process and associated microscopic mechanism of the Turnoff Creek rock avalanche in Canada are simulated. The present numerical results are compared with the field survey data and the results of depth-integrated continuum method. The final deposit range matches well with the field survey data. It is illustrated that the discrete element method is robust and feasible to capture the dynamic characteristics of large rock avalanche over a complex terrain. Besides, a new method to assess the landslide hazard level based on the discrete element method is proposed. According to the parameter sensitivity analysis, it is demonstrated that the basal friction coefficient and bond strength are essential to the final deposit while rolling coefficient and restitution coefficient have little effects on it.
【Keywords】Discrete element method; Contact model; Numerical modeling; Rock avalanche; Geological hazard assessment; Parameter analysis