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1、JournalofEngineeringGeology工程地質(zhì)學(xué)報(bào)1004—9665/2011/19(3)一0409.08觀音巖水電站壩址區(qū)右岸巖體溶蝕發(fā)育機(jī)理研究術(shù)王錦國(guó)①周志芳①陳松峰②(①河海大學(xué)地球科學(xué)與工程學(xué)院南京210098)(②江蘇省蘇北供水局南京210029)摘要觀音巖水電站位于金沙江上游,壩型初擬混凝土重力壩和心墻堆石壩組合壩。壩址區(qū)分布有侏羅系中蛇店組(Js)地層,巖性主要為鈣質(zhì)鐵質(zhì)膠結(jié)的礫巖、石英砂巖,其中礫石成分以泥晶灰?guī)r和生物灰?guī)r為主。在地下水作用下礫巖鈣質(zhì)溶蝕形成規(guī)模較大的囊狀空腔或孔洞,砂巖則表現(xiàn)為鈣質(zhì)膠結(jié)物流失溶
2、蝕呈砂土狀或砂糖狀,對(duì)壩基穩(wěn)定性造成了一定的影響。本文在對(duì)觀音巖水電站壩址區(qū)右岸地質(zhì)條件和水文地質(zhì)條件分析的基礎(chǔ)上,采用地下水動(dòng)力模擬、可溶成分統(tǒng)計(jì)、取樣室內(nèi)溶蝕試驗(yàn)等方法對(duì)巖體溶蝕發(fā)育機(jī)理進(jìn)行了分析。結(jié)果表明:巖體溶蝕作用主要受巖性、構(gòu)造控制;由于局部地下水流循環(huán)快,流速較大,順節(jié)理裂隙的走向方向溶質(zhì)作用強(qiáng)烈;鈣質(zhì)膠結(jié)的礫巖、含礫砂巖中,鈣質(zhì)礫石碎屑含量占30%~50%;新鮮巖石易受溶蝕且溶蝕速度較快。研究成果為:進(jìn)一步對(duì)大壩抗滑、變形及滲透穩(wěn)定性的影響評(píng)價(jià)奠定了基礎(chǔ),同時(shí)為水庫(kù)蓄水后地下水對(duì)巖體溶蝕作用的研究提供了背景。關(guān)鍵詞鈣質(zhì)膠結(jié)溶蝕圖
3、像統(tǒng)計(jì)水動(dòng)力場(chǎng)中圖分類號(hào):P642文獻(xiàn)標(biāo)識(shí)碼:ACoRRoSIoNMECHANISM0IFRoCKMASSATDAMSITELEFTBANKoFGUANYINYANHYDROPOWERSTATIONWANGJinguo①ZHOUZhifang①CHENSongfeng②(①CollegeofEarthScienceandEngineering,HohaiUniversity,Naming210098)((~NorthernJiangsuwaterSupplyBumau,Nanjing210029)AbstractTheGuanyinyanHyd
4、ropowerStationlocatesintheupperreachesofJinshaRiver.Thedamtypeisacombinationofconcretegravitydamandcorerockfilldam.ThestratuminthedamsiteismiddleShediangroupofJurassic.Thelithologyismainlythecalcareousferruginouscementedconglomerateandthequa~zsandstone.Themaincomponentsofcon
5、glomeratearecryptiteandbiolithite.ThelargecysticcavitiesorholesareformedbyCOrO—dedcalcareousferruginousundergroundwater.Thecorrodedcalcareouscementinsandstonedisplayssand—likeorsugar—like.Soitaffectsthestabilityofdamfoundation.Onthebasisofanalyzinggeologicalconditionsandhydr
6、o—ge—ologicalconditionsintherightbankofthestation,thispaperinvestigatesthegroundwater—dynamicsimulation,wa-ter-solubleelementstatisticsandcorrosionexperimentofsamplingforrockcorosionrules.Itisfoundthattherockandtectoniccontrolplayaleadingrolefortherockcorrosion.Thesolutereac
7、tionisdevelopedintenselyalongstrikedirectionofjointsandfractures,becauseoflocal—groundwaterwithquickcircleandrapidflowrate.Notonlytheag一}收稿日期:2010—08—20;收到修改稿日期:201l—o4—29.基金項(xiàng)目:水利部公益性項(xiàng)目(200901064),國(guó)家自然科學(xué)基金項(xiàng)目(2010511011)和高?;究蒲袠I(yè)務(wù)費(fèi)項(xiàng)目(2~9B11314)第一作者簡(jiǎn)介:王錦國(guó),從事工程地質(zhì)研究.Email:wang_ji
8、n~o@hhu.edu.cn410JournalofEngineeringGeology工程地質(zhì)學(xué)報(bào)2011glutinationofthesandy