基于GDEM的泥石流启动过程及成灾范围反演分析  

Inverse Analysis of Initiation Process and Disaster Range Debris Flow Based on GDEM

作　　者：周平根[1] 冯春[2,3] 武杰 王喜彦 ZHOU Pinggen;FENG Chun;WU Jie;WANG Xiyan(China Institute of Geological Environment Monitoring,Beijing 100081,China;Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China;Shanghai Investigation,Design&Research Institute Co.Ltd.,Shanghai 200434,China)

机构地区：[1]中国地质环境监测院,北京100081 [2]中国科学院力学研究所,北京100190 [3]中国科学院大学工程科学学院,北京100049 [4]上海勘测设计研究院有限公司,上海200434

出　　处：《中国铁路》2024年第1期38-47,共10页China Railway

基　　金：国家重点研发计划项目(2023YFC3007200)。

摘　　要：降雨型泥石流形成过程是一个水力耦合的复杂非线性过程,四川省绵竹市清平乡文家沟“8·13”特大泥石流灾害造成严重经济损失和人员伤亡。根据现场调查和资料收集,在文家沟区域地质环境条件的基础上,分析文家沟泥石流的形成条件;基于GDEM力学分析软件,采用深度积分的有限体积法对“8·13”泥石流的启动过程和成灾范围进行反演分析:启动阶段物源变形模拟采用摩尔库伦准则,当松散物源摩擦角为8°、黏聚力为50 Pa时,降雨1 h后,泥沙浓度达到15%,泥石流初步形成;运动堆积阶段泥石流运动及铲刮效应模拟采用Savage-Hutter模型,综合摩擦系数为3°时的成灾范围与“8·13”泥石流的成灾范围基本一致。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.

关 键 词：GDEM 泥石流 地质灾害 力学模拟 启动过程 成灾范围 文家沟 

分 类 号：X43[环境科学与工程—灾害防治]