白鹤滩水电站柱状节理玄武岩固结灌浆试验成果分析与建议.docx

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水利水电技术第46卷2015年第10期

白鹤滩水电站柱状节理玄武岩固结灌浆试验成果分析与建议

罗贯军，郭增光，张熊君

(中国长江三峡集团公司，四川宁南615421)

摘要：白鹤滩水电站大坝建基面扩大基础范围内广泛发育柱状节理玄武岩，岩体微裂隙发育，完整性较差。爆破开挖前柱状节理基本上呈闭合状态，可灌性较差，基础处理难度大。为研究提高柱状节理玄武岩坝基岩体承载力、强度和整体性的解决方案，探索相关灌浆方案、灌浆材料、浆液配合比及施工工艺等，在柱状节理玄武岩区域进行“有盖重灌浆”和“无盖重结合0~5m有盖重灌浆”固结灌浆试验。试验成果和物探测试成果为确定白鹤滩水电站大坝坝基固结灌浆施工方法和质量检查标准提供依据，同时也为类似地质条件工程提供参考。

关键词：白鹤滩水电站；柱状节理；玄武岩；固结灌浆doi:10.13928/ki.wrahe.2015.10.026

中图分类号：TV543.5文献标识码：B文章编号：1000-0860(2015)10-0117-04

AnalysisandsuggestiononachievementofconsolidationgroutingexperimentofcolumnarjointedbasaltforconstructionofBaihetanHydropowerStation

LUOGuanjun,GUOZengguang,ZHANGXiongjun

(ChinaThreeGorgesCorporation,Ningnan615421,Sichuan,China)

Abstract:WithintheexpandedareaofthefoundationsurfaceforthedamofBaihetanHydropowerStation,columnarjointedba-saltiswidelyspreadedwithdevelopedmicro-fissuresandpoorintegrity.Beforeexplosiveexcavation,thecolumnarjointsoftherockarebasicallyclosedwithlowergroutability,thusthetreatmentofthefoundationisquitediffcult.Inordertostudythesolu-tionschemeforenhancingthebearingcapacity,strengthandintegrityofthedamfoundationofcolumnarjointedbasaltandfindingouttherelevantgroutingscheme,groutingmaterials,groutmixingratio,constructiontechnology,ete.,theconsolidationgroutingexperimentsofthegroutingwithcover-weightandwithoutcover-weightcombinedwiththe0~5mcover-weightgroutingaremadeintheareaofthecolumnarjointedbasalt.Theachievementsfromboththeexperimentsandthegeophysicalprospectinglayaba-sisfordeterminingthegroutingconstructionmethodandthequalityinspectionstandard,simultaneously,provideareferenceforthoseprojectswithsimilargeologicalconditionsaswell.

Keywords:BaihetanHydropowerStation;columnarjoint;basalt;consolidationgrouting

1概述

1.1工程概况

白鹤滩水电站位于四川省宁南县和