Influence on Movement Velocity and Runout of Landslide of Basalt Sapropelitization Degree
Permian Emeishan basalt(P2β)with different sapropelitization degree is exposed in a large area of south-west mountainous area of China,and landslides occur frequently in the exposed area.In order to study the effects of basalt with different degrees of sapropelitization on the movement velocity,runout,and depositing of landslides,with the background of Jichang landslide in Shuicheng County,Liupanshui City,Guizhou Province,13 operating condi-tions of 4 calculation models with the density,the cohesion,and the internal friction angle decreasing respectively,and decreasing combined are established.The results calculated by Massflow software show that the three factors can af-fect the movement,runout,and depositing behavior of landslide.The decrease of internal friction angle and cohesive force both causes the landslide to move at a higher speed and to spread over a larger area.The decrease of density de-creases the movement speed and the runout area.In addition,the fresher basalt with higher density,greater cohesion and internal friction angle is not easy to form high-speed long-range hazardous landslide.
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