摘要
"5.12"汶川大地震后,中国西南地区积累了大量的松散堆积物,在强降雨作用下,这些松散堆积物容易启动产生泥石流。2010年中国西南地区更是经历了罕见的旱灾,长历时的干旱易引发强烈的森林火灾,后期易形成更强的降雨,同时,在干旱作用下,松散堆积物中的黏土颗粒收缩,在降雨作用下会迅速吸水膨胀,阻塞土体空隙,使孔隙水压力迅速增大,土体抗剪强度随之降低,更易启动产生泥石流。此文在历史上泥石流危险性特征的基础上,结合地震活动规律与干旱区分布特征,进行泥石流危险区划分,并在此基础上提出防控建议。
After the Wenchuan Earthquake,a plenty of loose materials accumulated in the southwest of China,and it can be easily initiated to form debris flow under the action of precipitation.In 2010,a rare drought disaster struck the southwest,which can lead to forest fire,and strong rainfall after this period.At the same time,clay par-ticles in the loose materials shrink under the action of longtime drought.However,clay particles swell after absorb-ing the rain t,hen they block the void,resulting in the increase of pore water pressure and decline of shear strength,under this circumstancesi,t is much more easily for the initiation of debris flow.Based on the risk charac-teristic of debris flow in history,combining with the discipline of earthquake activity and arid area,t this region was divided into three danger zones,and prevention strategies were proposed.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2010年第S1期1-6,共6页
Journal of Sichuan University (Engineering Science Edition)
基金
中国科学院知识创新工程资助项目(KZCX2-YW-332)
关键词
泥石流
地震
干旱
危险性分析
debris flow
earthquake
drought
risk analysis
