[1]屈永平,唐川,王金亮,等.强震区泥石流启动机制[J].山地学报,2012,(03):336.
　QU Yongping,TANG Chuan,WUANG Jingliang,et al.Debris Flow Initiation Mechanisms in Strong Earthquake Area[J].Mountain Research,2012,(03):336.
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强震区泥石流启动机制()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2012年03期
页码:
336
栏目:
山地学报
出版日期:
2012-01-01

文章信息/Info

Title:
Debris Flow Initiation Mechanisms in Strong Earthquake Area
作者:
屈永平;唐川;王金亮;唐宏旭;刘洋;陈海龙;黄伟;
成都理工大学地质灾害防治与地质环境保护国家重点实验室，四川 成都 610059
Author(s):
QU Yongping; TANG Chuan; WUANG Jingliang; TANG hongxu; LIU Yang; CHENG Hailong; HUANG Wei
State Key Laboratory for Geo-Hazard Prevention and Geo-Environment Protection，Chengdu University of Technology，Chengdu 610059，China
关键词:
泥石流; 滑坡堆积体; 岩土特性; 地表径流; 启动机制
Keywords:
debris flow; landslide deposits; geotechnical property; rainfall effects; initiation mechanism
分类号:
P642.23
文献标志码:
A
摘要:
地震区的泥石流物源主要来源于滑坡、崩塌等松散体,具有结构疏松,密实度低,堆积时间短等特点,与非地震环境中的滑坡、崩塌堆积体的结构有所不同,堆积体的物理力学性质发生了改变,堆积体转换为泥石流所需的外界条件也相应的改变。以汶川地震区都江堰市龙池镇典型泥石流灾害为例,分析了地震滑坡、崩塌松散体的堆积形态和堆积体的应力环境。从静力学和动力学角度分析堆积体在强降雨条件下的起动特征,探讨了降雨作用形成的地表径流水深与堆积体失稳时的应力极限状态的关系。分析得出沟道岸坡滑坡堆积体发生侵蚀时的地表径流力为F=(τ1f-f1sinα)/cos(α-26.65),并建立径流水深与地表径流力的关系:H=F/4ρsgJ...
Abstract:
Sediment supply for debris flow occurrence in the seismic zone mainly derived from loose deposits of seismic landslides and rockfalls. Normally the sediment supply in debris flow basin has some features such as loose structure，low density，and quick accumulation. It is much different from that in nonseismic zone. Due to change of physical property in the landslide deposits，it results in relevant change of external conditions for landslide debris transmitting in to debris flows. This paper analyzed depositional morphology and the stress environment of loose accumulation of the seismic landslides based on debris flow investigation in a study area of Longchi Town，Dujianyang City that located in the Wenchuan earthquake area. Debris flow initiation mechanism under the condition of rainstorm is discussed in a basis of an analysis of statics and danamics. The relationship between the runoff water depth and the ultimate stress state during landslide deposit failure in saturated condition was showed in the formula as following：F=（τ1f-f1sinα)/cos(α-26.65). And The relationship between the runoff water depth and surface runoff capacity was established as the formula：H=F4ρsgJ。Under the conditions of the conservation of mechanical energy，erosive volume model with an unit time of landslide deposit failure was established as the formula：dV=dM/γs。In order to apply the proposed model in actual situation，a study area in Shuida debris flow gully of Dujiangyang city of the Wenchuan earthquake area was selected. Result indicated that surface runoff depth when debris flow initiated reached 0.011 m，which is consistent with the result of field survey.

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备注/Memo

备注/Memo:
收稿日期(Received date)：2012-02-24；改回日期(Accepted) : 2012-04-10。
基金项目（Foundation item）：国家973计划（2011CB409903）和国家科技支撑计划课题（2011BAK12B01）。\[the National Basic Research Program of China (973 Program)(2011CB409903),National Science Technology Support Program(2011BAK12B01).\]
作者简介（Biography）：屈永平 ( 1984-) ,男 ,汉族 ,四川成都人，研究生，主要从事地质灾害及城市灾害研究。\[Qu Yongping，male，born in Chenggdu，Sichuan in 1984，graduate student，work mainly on geological disasters and urban disasters，State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection，Chengdu University of Technology，610059 Chengdu，China.\]E-mail：qyp1232006@126.com；Tel：15828257340
更新日期/Last Update: 1900-01-01