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1、JournalofEngineeringGeology工程地質(zhì)學(xué)報1004-9665/2013/21(4)-0649—08白鶴灘水電站左岸邊坡深部破裂成因探討術(shù)羅琳①榮冠①段偉鋒②李頌章①張璇①(①武漢大學(xué)水資源與水電工程科學(xué)國家重點實驗室武漢430072)、(②中國水電顧問集團(tuán)華東勘測設(shè)計研究院杭州310034)摘要在對白鶴灘水電站壩址區(qū)河谷地質(zhì)條件、地應(yīng)力分布及左岸邊坡深部破裂發(fā)育特征詳細(xì)分析的基礎(chǔ)上,采用離散元數(shù)值軟件UDEC以剝蝕法模擬河谷演化發(fā)育過程,分析白鶴灘水電站左岸邊坡深部破裂的形成原因。模擬結(jié)果反映河谷應(yīng)力場分布呈現(xiàn)出了典型深切河谷所具有的應(yīng)力
2、松弛、升高及原始三區(qū)以及谷底存在“高地應(yīng)力包”的規(guī)律。同時對河谷邊坡不同部位、不同階段的應(yīng)力變化規(guī)律進(jìn)行了深入分析并結(jié)合現(xiàn)今河谷地質(zhì)特征,認(rèn)為該深部破裂是在河谷地層順傾、區(qū)域高地應(yīng)力、不對稱“V”型河谷、下蝕迅速等特定條件下,在河谷演化過程中局部應(yīng)力集中使巖體發(fā)生剪切屈服,并發(fā)育剪切破壞,河谷剝蝕卸荷后順傾向錯動帶的出露使剪切破壞進(jìn)一步發(fā)育成張性破壞的結(jié)果。關(guān)鍵詞白鶴灘水電站邊坡深部破裂河谷演化離散元中圖分類號:TV223.1文獻(xiàn)標(biāo)識碼:AMECHANISMoFDEEPFRACTURESFoRMATIoNINLEFTBANKoFBAⅢETANHYDRoPoWER
3、STATIoNLUOLin①RONGGuan~DUANWeifeng~LISongzhang①ZHANGXuan~((~)StateKeyLaboratoryof耽燈ResourcesandHydropowerEngineeringScience,WuhanUniversity,Wuhan430072)((~HydrochinaHuadongEngineeringCorporation,Hangzhou310034)AbstractOnthebasisofthedetailedanalysisofthevalleygeologicalconditionsaswe
4、llasgeostressdistributionanddeepfracturesintheleftbankofBaihetanhydropowerstation,theevolvementanddevelopmentofthesiteval—IcyaresimulatedbyusingdistinctelementcodesUDECwithdenudationmethodtoanalysistheformationmecha—nismofdeepfracturesintheleftbank.Simulationresultsshowthatvalleystre
5、ssfielddistributionpresentsthelawofatypicaldeepvalleywiththreestressdistrictsofrelaxation,increaseandunchanged,aswellasvalleybottomexisting“highgeostressfold”.Basedonthedeepanalysisofdifferentpartsinthevalleyslope,diferentstagesofthestressvariationandpresentvalleygeologicalfeatures,i
6、tisconsideredthatthedeepfracturesareresultsofthetensilefailure.Theoutcropsoftheconsequentdipfaultzonesaftertheerodedvalleyunloadsmakeshearfailurefur-thergrow.Thoseshearfailuresareformedbecausethelocalstressconcentrationsmakerockshearfailureduringthevalleydevelopmentprocessatthespecia
7、lgeologicalstructuressuchasthedipdirectionofrocksalongslopethe,highregionaltectonicstress.theasymmetricv-shapedvalleyandrapidincisionofBaihetanhydropowerstation}收稿日期:2012—10-30;收到修改稿日期:2013—05—05.基金項目:國家重點基礎(chǔ)研究發(fā)展計劃973項目(2011CB0135012010CB732005),國家自然科學(xué)基金項目(50979081)教育部新世紀(jì)優(yōu)秀人才項目(NCET—l
8、1—0406)資助.第一