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2019 Vol. 25, No. 4
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Xiaobo HU, Xiaoyi FAN, Junjie TANG. ACCUMULATION CHARACTERISTICS AND ENERGY CONVERSION OF HIGH-SPEED AND LONG-DISTANCE LANDSLIDE ON THE BASIS OF DEM: A CASE STUDY OF SANXICUN LANDSLIDE[J]. Journal of Geomechanics, 2019, 25(4): 527-535. doi: 10.12090/j.issn.1006-6616.2019.25.04.051
Citation: Xiaobo HU, Xiaoyi FAN, Junjie TANG. ACCUMULATION CHARACTERISTICS AND ENERGY CONVERSION OF HIGH-SPEED AND LONG-DISTANCE LANDSLIDE ON THE BASIS OF DEM: A CASE STUDY OF SANXICUN LANDSLIDE[J]. Journal of Geomechanics, 2019, 25(4): 527-535. doi: 10.12090/j.issn.1006-6616.2019.25.04.051
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ACCUMULATION CHARACTERISTICS AND ENERGY CONVERSION OF HIGH-SPEED AND LONG-DISTANCE LANDSLIDE ON THE BASIS OF DEM: A CASE STUDY OF SANXICUN LANDSLIDE

  • 1.

    School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China

  • 2.

    Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang 621010, Sichuan, China

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Received Date:  27 November 2018
Revised Date:  05 January 2019
    Abstract
  • The velocity, accumulation characteristics and energy conversion are important factors in the study of the disaster-causing mechanism of high-speed and long-stance landslide; however, model test and field investigation can't fully reveal the mechanism. In this study, the landslide in Sanxicun was simulated by PFC3D to reveal that the velocity evolution distribution, accumulation characteristics and energy conversion relationship of frent, middle and rear rock and soil during the landslide movement process. The results show that, when the residual friction coefficient of Sanxicun landslide is 0.2, the simulation results are consistent with the actual accumulation characteristics. When the front, middle and rear rock and soil achieve peak velocity, the time distribution is Sfront < Smiddle < Srear. The velocity distribution of the front rock mass shows significant unimodal characteristic, while that of the rear rock mass is bimodal. The accumulation of rock and soil mass presents sequence distribution. In the transformation of gravitational potential energy of the landslide, friction energy accounts for 52% of the total energy, and only 15% of the gravitational potential energy at the peak of kinetic energy is converted into kinetic energy. The research results can provide reference for the analysis of the disaster-causing mechanism of high-speed and long-stance landslide and the project of disaster prevention and reduction.
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