孤山水电站不当施工诱发滑坡重大变形险情与稳定性分析  

SERIOUS DEFORMATION RISK AND STABILITY ANALYSIS OF LANDSLIDE INDUCED BY IMPROPER CONSTRUCTION IN GUSHAN HYDROPOWER STATION

作　　者：王启国 胡义 陕硕 WANG Qiguo;HU Yi;SHAN Shuo(Changjiang Geotechnical Engineering Corporation（Wuhan）,Wuhan 430010;Changjiang Institute of Survey,Planning Design and Research,Wuhan 430010)

机构地区：[1]长江岩土工程总公司(武汉),武汉430010 [2]长江勘测规划设计研究有限责任公司,武汉430010

出　　处：《工程地质学报》2018年第4期989-998,共10页Journal of Engineering Geology

基　　金：长江勘测规划设计研究院自主创新项目(CX2017Z25);长江岩土工程总公司(武汉)自主创新项目(CJ2018Z202)资助

摘　　要：孤山水电站混凝土生产系统场地位于一老滑坡体上,因场地平整施工滑坡出现重大变形险情,对工程建设构成严重危害。通过对场地工程地质特征和变形机制的系统研究,认为滑坡变形的主要诱因是前缘切脚的不当施工开挖活动。场平开挖已将滑坡肢解为东区、中部区和西区3大部分,滑坡变形对西区整体稳定影响较大,对东区和中部区的整体稳定影响较小,针对各区滑坡变形特征采取了应急工程处理。险情处理后,结合开挖现状和变形特征开展滑坡不同工况下的稳定性分区评价,结果表明:在天然状态下,除了滑坡东部(2)号变形体区域和滑坡西区仍不稳定外,其余部位处于基本稳定-稳定状态;在暴雨或久雨条件下,滑坡欠稳定-不稳定。为保证工程安全,滑坡需要进行工程治理。Concrete production system of Gushan hydropower station is located in an old landslide. Excavation induced serious deformation in the old landslide,which severely damaged the engineering construction. Through the systematic research on engineering geological conditions and deformation characteristics of engineering site,the deformation was mainly caused by improper construction excavation,rainfall and groundwater activity. Other factors also played a certain role in triggering. The excavation had dismembered landslide into three parts： the east,the middle and the west. The landslide deformation has a great influence on the overall stability to the west,but little to the east and middle areas. Emergency engineering measure has been adopted to deal with the landslide deformation characteristics. According to excavation status and stability condition,this paper assesses the stability of the landslide under different situations. The results show that in the natural state,besides the east（2） regional landslidedeformation in an unstable state,the west in a less state,the other parts are in the basic stability to the steady state.Under the condition of continuous heavy rainfall,the whole landslide is in a less stable or unstable state and needs to be governed.

关 键 词：滑坡 切脚开挖 变形险情 应急工程处理 成因机制 稳定性分析 

分 类 号：P642[天文地球—工程地质学]