Dynamic process of the Wenjiagou rock landslide in Sichuan Province, China
A rock avalanche is a geological event that is always sudden, rapid and with a long run-out, and can result in large loss of lives and property. The Wenjiagou rock avalanche was a high-speed rock landslide caused by a strong earthquake, in Mianzhu, Sichuan Province, southwest China. In this study, we reproduce the movement and deposition processes of the sliding mass by numerical simulation. We analyze the effects of the friction coefficient of each slip surface and the strength of the parallel bonds and contact stiffness between particles on the dynamic process and deposit features using three-dimensional particle flow code (PFC3D). The simulation results agree with the field measurements when the friction coefficient is 0.2, parallel bond strength is 2 MPa, and contact stiffness is 2 × 108 kN/m. The landslide lasted about 115 s from the initial movement to the final deposition at the exit of the valley. The maximum velocity of the sliding mass was 114 m/s.
KeywordsRock avalanche Numerical simulation Dynamic process Effect analysis
This study was supported by the National Natural Science Foundation of China (No. U1704243), Key Scientific Research Project Plan of Henan Higher Education Institutions (No. 17A410002), Project of Levee Safety and Disease Control Engineering Technology Research Center of The Ministry of Water Resources of the People’s Republic of China, and The Project of High Level Talents in North China University of Water Resource and Electric Power (No. 201518).We thank Dalia Lahav-Jones, from Liwen Bianji, Edanz Group China (www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.
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