成都龙门山区地震崩积砾石土特征及泥石流启动阈值研究

项目名称： 成都龙门山区地震崩积砾石土特征及泥石流启动阈值研究

项目编号： No.41201555

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 地理学

项目作者： 杨成林

作者单位： 中国科学院水利部成都山地灾害与环境研究所

项目金额： 25万元

中文摘要： 成都龙门山区地震次生泥石流灾害具有规模超大性、群发性和潜伏性等特点，近年来已造成严重人员和财产损失，严重威胁灾区恢复重建。面对日益严重的泥石流灾害，监测预警将是及时有效而经济合理的防灾手段，而泥石流监测预警系统的核心就是泥石流启动的特征阈值。本研究将通过室内外试验相结合的方法对泥石流源区地震崩积砾石土的特征及其启动泥石流时的特征阈值进行探索。研究中先通过遥感解译和野外调查分析地震次生泥石流源区崩积砾石土的分布规律；然后根据室内外实验和理论分析研究崩积砾石土体的物理及力学特征；再通过野外泥石流启动原型试验研究崩积砾石土土体破坏启动泥石流时的降雨量、土体孔隙水压力和土体含水量特征阈值，为研究区泥石流灾害的监测预警提供依据。

中文关键词： 成都龙门山区；泥石流；砾石土；土体启动；阈值

英文摘要： The earthquake triggered debris flows in Longmenshan Mountains of Chengdu which caused huge casualties and property damages, present a great threat to the downstream villages and the recovery.The debris flow were massive in total volume, group-occurring and latency, according to these character, the monitoring and warning system will be an economic and effective process. The core of the monitoring and warning system is the threshold value of debris flow initiation. This study is going to disclose the character of wide-graded gravel soil from debirs flow source region and propose its initiation threshold value such as rainfall intensity, pore water pressure and water content through laboratory and field experiments. Firstly, we will make out the distribution character of wide-graded gravel soil from debirs flow source region through the distribution character and field investigation. And the physical, mechanical character of gravel soil from debirs flow source region will be disclose through the laboratory experiments and theoretical analysis.Then, the threshold value of earthquake triggered gravel soil failure and debris flow initiation, including rainfall intensity, pore water pressure and water content will be proposed through field experiments, which could support the debris flow initiation research and monit

英文关键词： Longmenshan Mountains of Chengdu；debris flow；gravel soil；debris flow initiation；threshold value