摘要
大渡河沿岸分布的大量古滑坡堆积体,是流域内水电能源开发及山区城镇建设的重大隐患,双家坪古滑坡堆积体就是其中的典型案例。2010年8月以来,随着瀑布沟电站库区水位升高淹没堆积体前缘,堆积体西侧区域地面及房屋出现了较大规模的变形迹象。调查表明,出现变形的区域仅是一个古老滑坡堆积体的一部分。根据现场调查和钻探手段,从地貌、物质结构特征查明了该古滑坡堆积体的边界条件、各分区的堆积特征,认为该滑坡堆积体可分为4个区,其中A、C区为主要崩落堆积区,以大块石堆积为主,块石直径1~3 m,甚至更大;B区为残留岩体堆积区,岩层保留原岩层序;D区为细颗粒物质堆积区。初步认为古滑坡堆积体为平推式滑动→推出悬空→重力折断→散落堆积→表生改造等过程的形成机制。
There are a lot of ancient landslide accumulations along the Dadu River,which are the potential threat to hydraulic schemes and construction of towns in mountain areas. Shuangjiaping ancient landslide is one typical case.Since August 2010,the ground and houses appeared abundant deformations in the west part of accumulation body,as the reservoir impounding of the Pubugou reservoir,covering the frontal edge of accumulation body. The investigation showed that the deformation area is just a part of an ancient landslide accumulation. This paper is based on field investigation and drilling work. Boundary conditions and deposits characteristics of landslide accumulation are determined,which could be divided into four zones,including zone A and zone C,avalanche accumulation area,1~ 3 m in diameter（ some even 5 ~ 10 m）; zone B,residual rock mass accumulation area,＂fake bedrock＂,keeping the original order of bedrock; zone D,fine material accumulation area. Meanwhile,it is concluded that the mechanism of this ancient landslide,which including the processes of translational sliding,stopping and hanging in the air,avalanche accumulating,transformed etc.
出处
《山地学报》
CSCD
北大核心
2015年第1期58-64,共7页
Mountain Research
关键词
大渡河
滑坡堆积体
堆积特征
平推式滑动
Dadu River
landslide accumulation body
accumulation characteristics
translational sliding
