浅析坝下游黄土-砂卵砾石二元结构岸坡失稳机理  

Analysis on instability mechanism of bank slope with binary structure of loess stratum-sand and gravel layer in downstream of dam

作　　者：孟和 尚彦军[1,2,3] 伊学涛 曹小红 Meng He;Shang Yanjun;Yi Xuetao;Cao Xiaohong(Xinjiang Key Laboratory of Geohazard Prevention,Xinjiang Institute of Engineering,Urumqi,Xinjiang,830023,China;Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029,China;University of Chinese Academy of Sciences,Beijing,100049,China)

机构地区：[1]新疆工程学院新疆地质灾害防治重点实验室,新疆乌鲁木齐830023 [2]中国科学院地质与地球物理研究所页岩气与地质工程重点实验室,北京100029 [3]中国科学院大学,北京100049

出　　处：《新疆地质》2021年第1期152-155,共4页Xinjiang Geology

基　　金：第二次青藏高原综合科学考察研究资助(2019QZKK0904);服务于一带一路建设和防灾减灾的地质工程创新团队(2020D14014)联合资助。

摘　　要：新疆伊犁河流域水库大坝下游岸坡常具黄土-砂卵砾石二元结构地层组合,成为水库渗漏潜在隐伏结构。随着伊犁河流域水利水电工程建设开发力度的加大,该地层组合中显现出的渗漏和岸坡稳定性等工程地质问题也逐渐增多,有必要对该方面进行研究和总结。本文以斯木塔斯水电站、巴喀勒克水库为例,对其坝下游岸坡稳定性开展运行期的地质调查,并结合研究区地质背景,基本查明研究区坝下游岸坡二元结构地层组合系控制水库渗漏的主要模式。局部在黄土层底部发育软弱结构面,成为控制坝下游岸坡稳定性的主要因素。The downstream bank slope of the dam in the Yili River Basin in Xinjiang often has the binary structure of loess stratum-sand and gravel layer,which becomes the potential hidden structure of reservoir leakage.With the development of water conservancy and hydropower projects in Yili River Basin,the engineering geological problems such as seepage and bank slope stability in the stratum combination are gradually increasing.It is necessary to study and summarize this aspect.Taking simutas hydropower station and bakaleke reservoir as examples,this paper carries out geological survey on the stability of the bank slope downstream of the dam during the operation period,and combined with the geological background of the study area,basically finds out that the binary structure stratum of the bank slope downstream of the dam in the study area is the main mode to control the reservoir leakage.Weak structural planes are developed at the bottom of the loess layer in some sections,which become the main factor controlling the stability of the downstream bank slope of the dam.

关 键 词：二元结构 水库渗漏 滑坡 斜坡失稳 

分 类 号：P642.131[天文地球—工程地质学] P619.228[天文地球—地质矿产勘探]