南水北调与水利科技2016，Vol.14Issue(6)：176-182,7.DOI:10.13476/j.cnki.nsbdqk.2016.06.030
典型地震扰动区泥石流堆积体工程特性及其启动机制
Discussion on engineering characteristics of debris flow deposits and its initiating mechanism in typical earthquake disturbance area
摘要
Abstract
In earthquake disturbance and alpine‐gorge area ,instability slope with crushing rock is caused by active faults and fre‐quent earthquakes .Particle migration in the deposits is caused by water infiltration ,resulting in the change of saturation ,densi‐ty ,thus weakening its strength ,which subsequently induces occurrence of debris flow initiation .Debris flow gullies in two areas including Gansu Zhouqu county in the west Qinling mountains fault zone and Duwen highway in Longmen mountain fault zone were taken as an example ,physical and mechanical properties tests of the loose accumulation body were carried out .Experimen‐tal results showed that the two groups of debris flow deposits were silty gravel soil with wide and non‐uniform grading .Fine grain content in Zhouqu debris deposits was relatively high ,its specific gravity ,liquid limit ,plastic limit ,liquid index ,and plas‐ticity index were greater than those of soil sample of Duwen highway .When the moisture content of Zhouqu debris flow soil and Duwen highway slope soil increased to 15% ~18% and 12% ~15% respectively ,the soil cohesion c reduced sharply .It hinted the existence of critical moisture content in soil strength decline process .The specific moisture content could be used as the criti‐cal water content of debris flow initiation .Further statistical analysis showed one‐hour critical rainfall before occurrence of deb‐ris flow and the critical moisture content was closely related .By fitting the linear relativity between them ,the critical rainfall of debris flow could be deduced ,which can provide technical support for the prevention and early warning of debris flow in earth‐quake disturbed area .关键词
地震扰动区/泥石流/松散堆积体/工程特性/强度/临界含水率Key words
earthquake disturbance area/debris flow/loose deposit/Engineering characteristics/strength/critical moisture content分类
地质学引用本文复制引用
向灵芝,杨为民,范玮佳..典型地震扰动区泥石流堆积体工程特性及其启动机制[J].南水北调与水利科技,2016,14(6):176-182,7.基金项目
中国地质调查局项目（1212011120072）；“十二五”国家科技支撑计划项目（2011BAK12B09）；重庆交通大学国家内河航道整治工程技术研究中心暨水利水运工程教育部重点实验室开放基金资助项目（SLK2015B07） FundChina Geological Survey Project（1212011120072）；The National Science and Technology Pillar Program during the Twelfth Five-year Plan Period（2011BAK12B09）；Opening Foundation of Chongqing Jiaotong University ，National Inland Waterway Regulation Engineer-ing Technology Research Center and Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education （）
