七里水库大坝坝基蚀变带工程性质与坝基处理研究  

Research on engineering properties of dam foundation alteration zone and foundation treatment for Qili Reservoir

作　　者：林茂桂 陈启湖 陈水连 宋恒锋 LIN Mao-gui;CHEN Qi-hu;CHEN Shui-lian;SONG Heng-feng(Guangxi Guiyu Engineering Consultant Co.,Ltd.,Nanning 530023,China;Guangxi Guidong Hydropower Survey and Design Institute Co.,Ltd.,Wuzhou 543006,China)

机构地区：[1]广西桂禹工程咨询有限公司,南宁530023 [2]广西桂东水电勘测设计院有限责任公司,广西梧州543006

出　　处：《广西水利水电》2025年第2期14-20,共7页Guangxi Water Resources & Hydropower Engineering

摘　　要：七里水库新建大坝坝基跨越沉积岩与花岗岩两种不同岩性的岩体,花岗岩与沉积岩接触面发育有蚀变带,其工程地质性质较差,为坝基软弱夹层。本次勘察采取了钻探、声波测井、钻孔电视、室内试验等多种勘探手段,查明了蚀变带在坝基范围内的空间分布及其工程性质,并对蚀变带采取浅层挖除加混凝土塞,上部铺钢筋混凝土板,对深部蚀变带进行帷幕灌浆等综合处理措施,改善了蚀变带工程性质,减少了坝基不均匀沉降及坝体内应力,取得了良好处理效果。The new dam foundation of Qili Reservoir spans two different lithological rock masses of sedimentary rocks and granite.An alteration zone developed at the contact surface between granite and sedimentary rocks has poor engineering geological properties,and is considered a weak interlayer in the dam foundation.Multiple explora-tion methods such as drilling,acoustic logging,borehole television and laboratory tests were used to determine the spatial distribution and engineering properties of the alteration zone within the scope of dam foundation.Comprehen-sive treatment measures were adopted for this alteration zone including shallow excavation and concrete plugs,rein-forced concrete slabs laid on top,and curtain grouting for the deep position of alteration zone.These measures have improved the engineering properties of the alteration zone,reduced uneven settlement of the dam foundation and in-ternal stress within the dam,achieving satisfactory results.

关 键 词：蚀变带 帷幕灌浆 混凝土塞 钢筋混凝土板 七里水库 

分 类 号：TV223.3[水利工程—水工结构工程]