泥石流源地土体应力应变特性对降雨响应过程的分析--以蒋家沟泥石流为例  

Analysis of Rheological Characteristics of Soil in Source Area of Debris Flow to Answer Process to Rainfall

作　　者：王裕宜[1,2] 詹钱登[3] 洪勇[1,2] 田冰[4] 邹仁元[2] 

机构地区：[1]中国科学院山地,火害与地表过程重点实验室,中国科学院东川泥石流观测研究站,四川成都610041 [2]中国科学院水利部成都山地灾害与环境研究所,四川成都610041 [3]台湾成功大学水利及海洋工程系,台湾台南701013 [4]河北师范大学资源与环境科学学院,河北石家庄050016

出　　处：《山地学报》2009年第4期457-465,共9页Mountain Research

基　　金：自然科学基金资助(40671026)~~

摘　　要：根据对蒋家沟泥石流源地的崩塌、滑坡、散流坡,在旱季与雨季不同时段,降雨入渗后的土壤含水状况观测,以及泉水季节性变化,详细分析了泥石流源地崩塌、滑坡、散流坡土体的应力应变特性对降雨的响应过程差异。在雨季滑坡临空面和滑坡体内的土体含水量分别为6.67%、4.8%,滑坡活动主要是通过前缘剪出口崩塌方式补给下方沟床。崩塌体由于土体结构极为松散,在雨季该土体含水量通常高达8.85%～16%,使其土体的抗剪强度(C、φ)处于极限应力状态,一旦遇到降雨浸润和冲刷,迅速触变液化,转化为高浓度泥石流的侵蚀产沙过程。Rheological characteristic of soil on collapse-landslid and stream slop in debris flow formation-zone to an- swer process to rainfall are analyzed in this article, which is through different periods of rainy season , observation of different soil moisture status after rainfall Infiltration and season change of fountain.. Analyzed results indicated that the rheological characteristics of soil on collapse-landslid in debris flow formation will answer different process to rainfall. The soil moisture on free face of landslide is 6.67% ,4.8% respectivelly in rainy season, activity in land- slide mostly is supplied down gully bed by collapse manner action passed its forward edge. It is easily thixotropic liquefaction for the soil to locate limit stress state under infiltrate and washed out of rainfall, because the soil in col- lapse is the most loose, also when the soil moisture generally is higher 8.85% - 16% in rainy season. Then it will translate into eroded process of debris flow with hiper-consentration.

关 键 词：崩塌 滑坡 含水量 极限应力 泥石流 

分 类 号：P642.23[天文地球—工程地质学]