摘要
该河段是汶川地震触发灾害最为严重的河段之一。基于详细的实地调查和遥感解译成果,分析崩塌灾害的空间分布,崩塌发育斜坡物质组成、高程、坡高、坡度、坡形和失稳部位及崩塌形成机理,揭示震后崩塌灾害的发育规律。崩塌的发生存在明显的背坡面效应和方向效应,岩质边坡崩塌最为发育,且多发育于花岗岩、闪长岩和辉长岩等硬岩斜坡中,崩塌破坏模式以滑移式和倾倒式为主。
This river section is one of the most seriously earthquake-destructed sections. We disclosed the development pat-tern of the collapses by analyzing their spatial distribution, collapsed slope＇s material composition, slope elevation, slope height, slope gradient, slope shape, slope instable parts, and collapse formation mechanism, based on the detailed results of field surveys and remote sensing interpretation. The collapses have obvious backward slope effect and directional effect. There occur mostly rock, especially hard rock of granite, diorite and gabbro, collapses. Their main failure modes are skid and dump ing.
出处
《地质灾害与环境保护》
2014年第1期31-36,共6页
Journal of Geological Hazards and Environment Preservation
基金
国家自然科学基金(2008CB425801)
中国地质调查局项目(1212010914010)
关键词
岷江
震后崩塌
分布规律
背坡面效应
方向效应
Minjiang
seismic collapses~ distribution
backward slope effect
directional effect
