崩塌堆积体启动坡面泥石流判别与防治——以北川县开坪乡平石板泥石流为例  

Discrimination and Prevention of Slope Debris Flow Caused by Collapse Accumulation:A Case Study on Pingshiban Debris Flow in Beichuan

作　　者：佘涛[1,2] 李金洋 陈欢[1,2] 孙金辉[1,2] 李波[1,2] SHE Tao;LI Jin-yang;CHEN Huan;SUN J in-hui;LI Bo(Institute of Exploration Technology,CAGS,Chengdu Siehuan 611734,China;Technical Center for Geological Hazard Pre-vention and Control,CGS,Chengdu Siehuan 611734,China)

机构地区：[1]中国地质科学院探矿工艺研究所,四川成都611734 [2]中国地质调查局地质灾害防治技术中心,四川成都611734

出　　处：《探矿工程（岩土钻掘工程）》2018年第8期88-92,共5页Exploration Engineering:Rock & Soil Drilling and Tunneling

基　　金：中国地质调查局地质调查项目"涪江流域1:5万环境地质调查"(编号:DD20160251)

摘　　要：强震区地震后大量的崩塌堆积体堆积于高陡斜坡中上部,堆积体远离居民点,一旦诱发为坡面泥石流,形成新的次生地质灾害,将严重威胁下方居民的生命财产安全。本文以北川县开坪乡平石板坡面泥石流为例,平石板沟"5.12"地震崩塌堆积体在2010、2013年强降雨作用下失稳转变为坡面泥石流淤积场镇。在平石板泥石流暴发特征介绍基础上,通过粒径不均匀系数、堆积体启动判别指标、后缘汇水面积等来分析崩塌堆积体启动条件及影响因素,并针对此类灾害发育特征,提出了通过上游稳拦固源方法进行治理的防治思路。以期为研究高陡斜坡堆积体的启动机制及防治提供一定的借鉴意义。Great amount of collapsed accumulations are accumulated on the upper part of the high and steep slopes after the earthquake in the meizoseismal area. The accumulations are far away from the residential area, but once they are induced to form debris flow, a new secondary geological disaster will be produced, which will seriously threaten the lives and property of the residents below. Taking the debris flow of the Pingshibangou slope in Kaiping Township of Beichuan County as an example, the collapsed accumulation body of Pingshibangou in ＂5.12＂ earthquake turned into a slope debris flow under the inducement of heavy rainfall in 2010 and 2013. Based on the introduction of outbreak characteristics of Pingshibangou debris flow, this paper analyzes the starting conditions and influencing factors of the collapsed accumulation body by using the non-uniform coefficients of particle size, the discriminating index of starting body for accumulation and catchment area of the back edge, etc. In response to tbe develop ment characteristics of such disasters, a prevention and control approach for upstream accumulations stabilization is proposed in order to provide a reference for the study on startup mechanism and control of high and steep slope accu mulations.

关 键 词：崩塌堆积体 坡面泥石流 不均匀系数 判别指标 防治 

分 类 号：P642.23[天文地球—工程地质学]