Inverse Analysis of Initiation Process and Disaster Range Debris Flow Based on GDEM
The formation process of rainfall debris flow is a complex nonlinear process that involves hydraulic coupling.A catastrophic debris flow disaster struck Wenjiagou in Qingping Township,Mianzhu City,Sichuan Province on August 13,2010.It resulted in significant economic losses and casualties.Based on field investigation and data collection,this paper analyses the formation conditions of the Wenjiagou debris flow,taking into account the geological environment conditions specific to the Wenjiagou area.Based on the GDEM mechanical analysis software,an inverse analysis was conducted on the initiation process and disaster range of the"8·13"debris flow with the finite volume method of depth integration:The Mohr-Coulomb criterion was used to simulate the source deformation in the initiation stage.For loose sources with a friction angle of 8° and cohesive force of 50 Pa,when the sediment concentration reached 15％after one hour of rainfall,the debris flow initially formed.The Savage-Hutter model was used to simulate the movement and scraping effect of the debris flow in the movement and accumulation stage.When the comprehensive friction coefficient reached 3°,the disaster range was consistent with that of the"8·13"debris flow.
万方数据
维普
