沟道松散物质起动形成泥石流实验研究
胡凯衡; 葛永刚; 崔鹏; 陈晓清
刊名四川大学学报(工程科学版)
2010
卷号42期号:5页码:230-236
关键词沟道松散物质起动 起动模式 起动机理 水槽实验 汶川地震
其他题名Research on Debris Flow Initiation Due to Bed Failure After Wenchuan Earthquake
通讯作者崔鹏
合作状况其它
中文摘要为研究震后环境突变条件下的泥石流形成模式和机理,开展震后泥石流防治和预测,根据震后泥石流形成环境特点,设计泥石流起动装置,开展震后泥石流形成模式和机理试验。本研究共进行了25组试验,主要研究了泥石流在不同坡度情况下的泥石流形成模式和机理,结果表明:1)在坡度8°~12.5°情况下,泥石流的形成模式是冲蚀→冲沟→崩塌→堵塞→溃决→泥石流的模式;2)在坡度12.5°~17.5°情况下,泥石流的形成模式是逐渐侵蚀加剧(朔源侵蚀、下切侵蚀和侧蚀),容重逐渐增加形成泥石流的模式;3)在坡度17.5°~25°情况下,泥石流的形成模式是坡面流水→入渗→失稳→下滑→流态化的模式;4)根据孔隙水压力变化特征,不同的起动模式下的土体内部孔隙水压力变化特征不同,孔隙水压力的变化可以解释不同泥石流起动模式的机理特征。根据研究结果,可以对不同起动下的泥石流模式进行不同的防治规划,同时结合泥石流起动过程中孔隙水压力的变化,可以解释泥石流起动的模式,对开展震后泥石流预报提供了参考。
英文摘要In order to understand the initiation model and mechanism of debris flow,and forecast and prevent it after earthquake,the facilities of debris flow initiation were designed according to the post-earthquake environment to study the debris flow initiation mechanism.The tests of 25 groups were carried out at different slopes using the same soil material to study the debris flow initiation at varies slopes.The results showed that the initiation mode of debris flow was erosion → gully → collapse → block → failure and transformed into debris flow between 8° ~ 12.5° as initiation due to dam-failure.The initiation mode of debris flow was increased erosion gradually(down cut erosion,back word cut and lateral erosion) with the bulk density increasing and transformed into debris flow between 12.5° ~ 17.5° as initiation due to erosion.The initiation mode of debris flow was surface flow → infiltration → failure → fluidization and transformed into debris flow between 17.5° ~ 25° as initiation due to slope failure.The change character of water pore-pressure was different at different slope experiments,and the water pore-pressure inner soil revealed the initiation mechanism of debris flow at different slope. 
学科主题灾害学
分类号P642.23
收录类别EI ; CSCD
资助信息国家“973”计划资助项目(2008CB425802);中科院知识创新项目(KZCX2-YW-Q03-5)
语种中文
CSCD记录号CSCD:3986240
公开日期2012-05-03
内容类型期刊论文
源URL[http://192.168.143.20:8080/handle/131551/3917]  
专题成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
推荐引用方式
GB/T 7714
胡凯衡,葛永刚,崔鹏,等. 沟道松散物质起动形成泥石流实验研究[J]. 四川大学学报(工程科学版),2010,42(5):230-236.
APA 胡凯衡,葛永刚,崔鹏,&陈晓清.(2010).沟道松散物质起动形成泥石流实验研究.四川大学学报(工程科学版),42(5),230-236.
MLA 胡凯衡,et al."沟道松散物质起动形成泥石流实验研究".四川大学学报(工程科学版) 42.5(2010):230-236.
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