川中红层地区混凝土重力坝建基面选择研究  

Study on choice of foundation surface of concrete gravity damin central Sichuan red layer area

作　　者：余侃柱 YU Kanzhu(Gansu Water Resources and Hydropower Survey and Design Institute Co.,Ltd.,Lanzhou 730000,China)

机构地区：[1]甘肃省水利水电勘测设计研究院有限责任公司,甘肃兰州730000

出　　处：《人民长江》2020年第11期146-152,共7页Yangtze River

基　　金：国家重点研发计划课题项目(2016YFC0401801)。

摘　　要：中生代侏罗系中统上沙溪庙组地层广泛分布于四川盆地及周边的重庆市区,岩性主要为软岩泥岩与较软岩-中硬岩长石砂岩红层类,具有层状软硬相间的特征,在此类地基上拟建水利水电工程有着广阔的发展前景。在红层类岩体修建的中坝混凝土重力坝,其建基面合理选择直接影响安全性、开挖量、投资和工期。以修建在红层岩体上的龙象寺水库混凝土重力坝建基面为例,采用工程地质平面及剖面测绘、钻孔及平硐勘探、压水试验、声波检测、智能钻孔电视测试、室内及现场试验,并借助BIM技术3D建模设计,以及定性评价与定量相结合等方法,深入研究了建基面主要工程地质问题,包括风化带划分、坝基应力与变形、抗滑稳定、坝基渗漏等,优选了混凝土重力坝建基面和处理措施,实施效益显著。研究结果可为在川中上沙溪庙组红层岩体上修建中高高度混凝土重力坝提供借鉴与参考。The upper Shaximiao formation of the Middle Jurassic is widely distributed in Sichuan Basin and the surrounding Chongqing urban area.The lithology is mainly composed of soft mudstone and relatively soft-medium hard feldspathic sandstone,which has the characteristics of layered soft and hard interphase.Constructing water conservancy and hydropower projects on such foundation has a broad development prospect.The reasonable selection of foundation surface of middle-high concrete gravity dams constructed on the red bed rock mass,will directly affect the safety,excavation quantity,investment and construction period.Taking the foundation surface of Longxiangsi Reservoir concrete gravity dam,building on the red bed rock mass,as an example,the main engineering geological problems of the foundation surface was deeply studied by means of engineering geological plane and profile mapping,borehole and adit exploration,water pressure test,acoustic detection,intelligent borehole TV test,indoor and field test,3D modeling design of BIM Technology and combination of qualitative evaluation and quantitative analysis.In order to solve the engineering geological problems,including the division of weathering zone,stress and deformation of dam foundation,the stability against sliding and dam foundation leakage,the foundation surface and treatment measures of concrete gravity dam were optimized,and the implementation benefits were remarkable.The research results can provide reference for the construction of middle-high concrete gravity dams on the red bed rock mass of Upper Shaximiao Formation in Central Sichuan.

关 键 词：混凝土重力坝 建基面 上沙溪庙组红层 软硬相间坝基 龙象寺水库 

分 类 号：TV642.3[水利工程—水利水电工程]