TITLE:
Effects of Inter-Particle Frictional Coefficients on Evolution of Contact Networks in Landslide Process
AUTHORS:
Lian Jiang, Enlong Liu, Jianqiu Tian, Xiaoqiong Jiang
KEYWORDS:
Evolution of Contact Network, Landslide, Complex Network, Inter-Particle Frictional, Clustering Coefficient, N-Cycle
JOURNAL NAME:
Engineering,
Vol.9 No.11,
November
27,
2017
ABSTRACT: During the process of landslide, its dynamic mechanism is important to understand and predict these kinds of natural hazard. In this paper, a new method, based on concepts of complex networks, has been proposed to investigate the evolution of contact networks in mesoscale during the sliding process of slope. A slope model was established using the discrete element method (DEM), and influences of inter-particle frictional coefficients with four different values ondynamic landslides were studied. Both macroscopic analysis on slopelandslideand mesoanalysis on structure evolution of contact networks, including theaverage degree, clustering coefficientand N-cycle, were done during the processof landslide. The analysis results demonstrate that: 1) with increasing inter-particlefrictional coefficients, the displacement of slope decreases and the stable angle of slope post-failure increases, which is smaller than the peak internal frictional angle; 2) the average degree decreases with the increase of inter-particle frictional coefficient. When the displacement at the toe of the slope is smaller,the average degree there changes more greatly with increasing inter-particlefrictional coefficient; 3) during the initial stage of landslide, the clustering coefficientreduces sharply, which may leads to easily slide of slope. As the landslidegoingon, however, the clustering coefficientincreases denoting increasing stabilitywithincreasing inter-particle frictional coefficients. When the inter-particlefrictional coefficient is smaller than 0.3, its variation can affect the clustering coefficientand stable inclination of slope post-failure greatly; and 4) the number of3-cycle increases, but 4-cycle and 5-cycle decrease with increasing inter-particle frictional coefficients.