SichuanHydropower9固增水电站有压引水隧洞支洞封堵防渗施工技术王军红(中国水利水电第七工程局有限公司,四川成都610213)摘要:固增水电站建设采用EPC总承包模式,其中引水隧洞全长11.06km,在隧洞出口末端设置调压室。鉴于引水隧道围岩风化破碎严重且地下水丰富,围岩以Ⅳ、Ⅴ类岩体为主,导致施工支洞采用混凝土封堵后渗透性强,对其结构安全及稳定破坏性大。通过研究与分析,最终决定采用有效的防渗施工技术进行处理并达到了设计要求的防渗标准,所取得的经验可为类似工程借鉴。关键词:固增水电站;预固结灌浆;有压引水隧洞;帷幕灌浆;遇水膨胀止水条;橡胶止水;环氧灌浆;防渗施工技术中图分类号:TV7;TV52;TV554文献标志码:B文章编号:1001-2184(2023)05-0009-04ConstructionTechnologyofSealingandAnti-seepagefortheAditsofthePressuriedHeadraceTunnelWANGJunhong(SinohydroBureau7Co.,Ltd.,ChengduSichuan610213)Abstract:TheconstructionofGuzengHydropowerStationadoptsEPCgeneralcontractingmode,ofwhichthetotallengthoftheheadracetunnelis11.06km,andthereisasurgechamberattheendoftheoutlet.Thesur-roundingrockoftheheadracetunnelismainlycomposedofClassIV.andV.,inviewofthatthesurroundingrockissevereweathering,brokenandabundantwithgroundwater,resultinginthattheaditshavestrongper-meabilityafterbeingsealedwithconcrete,whichhasgreatdamagetothestabilityofthesafetystructure.Throughtechnicalresearchandanalysis,itwasfinallydecidedtoadopteffectiveanti-seepageconstructiontech-nologyandmeettheanti-seepagestandardsrequiredbythedesign,andtheexperiencegainedcanproviderefer-enceforsimilarprojects.Keywords:GuzengHydropowerStation;Pre-consolidatedgrouting;Curtaingrouting;Waterexpansionstop-pingstrip;Rubberwater-stopping;Epoxygrouting;Anti-seepageconstructiontechnology1概述固增水电站位于四川省凉山彝族自治州木里藏族自治县固增苗族自治乡,属于多民族居住区,电站采用引水式发电,主要建筑物等级为Ⅲ级,引水隧洞布置于木里河左岸,全长11.06km,纵坡降i=2.0869‰,隧洞衬砌后的净断面尺寸为6.1m×7.8m;隧洞位于高山峡谷地貌区,地形高差悬殊,沿线沟谷深切,多呈不对称的“U”和“V”型谷,植被较发育,洞轴线垂直埋深为60~760m;隧洞处于前山背斜和甲沟向斜NW末端,向斜地下水储量丰富;规模较大的断层有4条,分...
