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1、第35卷第3期人民黃河Vo1．35．No．32013年3月YELLOWRIVERMar．，2013【水利水電工程】考慮應(yīng)力狀態(tài)的裂隙巖體滲透系數(shù)張量計(jì)算楊金保，李蕾，謝妮(1．中國地震局地震研究所地震大地測(cè)量重點(diǎn)實(shí)驗(yàn)室，湖北武漢430071；2．武漢地震工程研究院，湖北武漢430071；3．河南省電力勘測(cè)設(shè)計(jì)院，河南鄭州450000；4．中國地質(zhì)大學(xué)工程學(xué)院，湖北武漢430074)摘要：滲透系數(shù)張量的正確確定是進(jìn)行大范圍裂隙巖體滲流計(jì)算的基礎(chǔ)。以實(shí)測(cè)巖體不連續(xù)面的幾何特征和統(tǒng)計(jì)參數(shù)為基礎(chǔ)，利用立方定律計(jì)算滲透系數(shù)張量時(shí)，還毖須進(jìn)行裂隙粗糙度、裂隙網(wǎng)絡(luò)連通程度的修正，并考慮應(yīng)力變化對(duì)滲透系數(shù)的影
2、響。對(duì)取自丹江口水庫庫區(qū)的輝綠巖剪切裂隙進(jìn)行了不同圍壓和裂隙水壓力下的滲透試驗(yàn)，結(jié)果表明：裂隙的滲透系數(shù)與凈圍壓的關(guān)系符合指數(shù)函數(shù)特征，而隨著裂隙水壓力的增大，裂隙面兩側(cè)基巖發(fā)生附加變形，導(dǎo)致滲透系數(shù)增大。在此滲流試驗(yàn)的基礎(chǔ)上對(duì)滲透系數(shù)進(jìn)行考慮三向應(yīng)力和裂隙水壓力變化的修正后，得到新的滲透系數(shù)張量計(jì)算公式。對(duì)丹江口水庫庫區(qū)某段裂隙巖體滲透系數(shù)張量的計(jì)算實(shí)例表明，修正后的滲透系數(shù)張量更符合實(shí)際。關(guān)鍵詞：裂隙巖體；滲透系數(shù)張量；滲流一應(yīng)力耦合；滲透試驗(yàn)；丹江口水庫中圖分類號(hào)：TV698。l；TU449文獻(xiàn)標(biāo)志碼：Adoi：10．3969／j．issn．1000-1379，2013．03．044Hy
3、draulicConductivityTensorforFracturedRockMassConsideringStressStateYANGJin—bao，LILei，XIENi(1．KeyLaboratoryofEarthquakeGeodesy，InstituteofSeismology，CEA，Wuhan430071，China；2．WuhanInstituteofSeismologicEngineering，Wuhan430071，China；3．HenanElectricPowerSurvey＆DesignInstitute，Zhengzhou450000，China；4．Facu
4、ltyofEngineering，ChinaUniversityofGeoscienees，Wuhan430074，China)Abstract：Thehydraulicconductivitytensorisasetofparametersfundamentaltotheseepageanalysisforlarge-scalefracturedrockmass．Basedonthegeometricalcharacteristicsandstatisticparametersofdiscontinuitiesinrockmassobtainedbymeansoffieldsurvey，th
5、ecubiclawisusuallyusedforthecalculationofhydraulicconductivitytensor，andsomemodificationmustbemadeconsideringtheroughnessoftherealdiscontinuities，theconnectivityofthe~acturenetwork，andtheinfluenceofstressvariation．Permeabilitytestsunderdiferentconfiningpressureandfracturewaterpressurewerecarriedouto
6、ndiabaserocksamplesfromDanjiangkouReservoirtostudythepermeabilitycharacteristicoftheshearfracture．Thetestresultsshowthatthepermeabilityoffracturedecreaseswiththeincreaseofnetconfiningpressure，followingthelawofexponentialdecay．Whilewiththeincreaseoffracturewaterpressure，thefracturepermeabilityincreas
7、esaswellbecauseoftheenlargementoffractureapeaurecausedbytheadditionalcompressionoftherockmatrix．Thus，furthermodificationconsideringstressvariationwasmadebasedontheexperimentaldataandanewcalculationfor
