水土保持学报2017，Vol.31Issue(6)：116-122,7.DOI:10.13870/j.cnki.stbcxb.2017.06.020
初始含水率对冰川泥石流的起动影响分析
Influence of Initial Water Content on Glacial Debris Flow Triggering Process
摘要
Abstract
Antecedent rainfall plays an important role in the triggering mechanism of debris flow.The glacial debris flow triggering experiments of different original soil water content were carried out to simulate the washed glacial drift triggering process under varieties of antecedent rainfall.The results showed that:(1) The evolution type of glacial debris flow in study area preliminarily could be defined as slope-slide model.(2) Seepage played a leading role at the low original soil moisture content.A large number of fine particles occurred,leading to the intergranular porosities increased to the original two times when grain-contact stress falling;then the rearrangement of the soil structure and enlargement of the pore-water pressure lead to the soil particles failure.It could be shown in the pore-water pressure as a "fall-uprush-fall" form.(3)Both Seepage and scour were key factors at higher original moisture content.The starting process of debris flow was intermittent,and the triggering moment that was the peak moment of pore-water pressure.(4) Both pore-water pressure and the volumetric soil water content showed periodical curves.The original soil water content was negatively associated with the debris flow starting time.(5) Based on the experiment phenomenon and the characteristics of curves,debris flow could be divided into four steps in this study.And the mechanism could be concluded to seepage erosion,soil front end framework and runoff scouring.关键词
前期降雨量/初始含水率/冰川泥石流/孔隙水压力/体积含水率/起动机理Key words
antecedent rainfall/initial water content/glacial debris flow/pore-water pressure/volumetric water content/triggering mechanism分类
天文与地球科学引用本文复制引用
潘蕾,魏学利,张远芳,李宾,杨新龙..初始含水率对冰川泥石流的起动影响分析[J].水土保持学报,2017,31(6):116-122,7.基金项目
国家自然科学基金项目(41602331) （41602331）
中国沙漠气象科学研究基金项目(Sqj2015015) （Sqj2015015）
中国博士后基金项目(2016M602951XB) （2016M602951XB）
新疆交通厅科技项目(2015-2017) （2015-2017）
新疆农业大学研究生校级创新项目(XJAUGR2016-031) （XJAUGR2016-031）
