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1、JournalofEngineeringGeology工程地質(zhì)學(xué)報(bào)1004-9665／2012／20(4)一0570—06裂隙巖體滲流場(chǎng)的無單元法模擬及滲流特性研究劉昌軍丁留謙寧保輝張順福(中國水利水電科學(xué)研究院北京100038)摘要裂隙巖體因含有發(fā)育程度不同的裂隙、節(jié)理和斷層等不連續(xù)面，致其滲透性具有各向異性、不連續(xù)性等特點(diǎn)，因此傳統(tǒng)的有限元法對(duì)分布密集的裂隙巖體滲流場(chǎng)求解有一定的難度。本文提出了采用無單元Glaerkin法求解有自由面裂隙滲流問題，并推導(dǎo)了無單元法求解滲流場(chǎng)的基本方程和積分格式，給
2、出了應(yīng)用罰函數(shù)法處理滲流邊界條件和自由面處理方法。采用IDL語言編制了二維無單元法計(jì)算軟件LIDAREFM。文中以北京懷柔橋梓鎮(zhèn)某裂隙巖體邊坡滲流場(chǎng)計(jì)算為例，研究了復(fù)雜裂隙共同作用下滲流場(chǎng)特性和自由面分布，討論了不同開度、不同連通程度的裂隙對(duì)滲流場(chǎng)的影響。研究結(jié)果表明：無單元法可以較好地解決有密集裂隙的巖體滲流場(chǎng)的求解問題，實(shí)現(xiàn)了裂隙處結(jié)點(diǎn)任意加密以及積分網(wǎng)格的獨(dú)立布置，避免了對(duì)有自由面和裂隙穿越的子域的重新處理，簡(jiǎn)化了滲流問題的求解過程。關(guān)鍵詞裂隙巖體無單元法各向異性罰函數(shù)法自由面中圖分類號(hào)：TU4
3、43文獻(xiàn)標(biāo)識(shí)碼：AMESHLESSSIMULATIoNoFSEEPAGEFIELDANDSEEPAGECHARAC．TERISTICSFoRFRACTUREDRoCKLIUChangjunDINGLiuqianNINGBaohuiZHANGShunfu(ChinaInstituteofWaterResourcesandHydropowerResearch，Beijing100038)AbstractThediscontinuitiessuchascracks，jointsandfaultscanhav
4、ethevaryingdegreesofdevelopments．Thepermeabilityoffracturedrockcanshowthecharacteristicsofanisotropyanddiscontinuity．Thetraditionalfiniteele—mentmethodencountersdifficultyinthesolutionoftheseepagefieldforintensivefracturedrocks．Thispaperpro—．posesthesol
5、utionofseepageproblemswithfreesurface．ItisobtainedthroughmeshlessGalerkinmethod．thecorre—spondingbasicequationsandintegrationschemesarederived．Applicationsofpenaltyfunctionmethodtothepro2cessingprocedureofseepageboundaryconditionandfreesurfaceboundaryar
6、ealsoputforward．Two—dimensionalmeshlessmethodsoftwareLIDAREFMisdevelopedwithIDLlanguage．Researchonseepagefieldcharacteristicsanddistributionoffreesurfaceunderdifferentdiscontinuitycombinationsarecarriedout，takingthefracturedrockslopeatQiaozitown，Huairou
7、CountyinBeijingasanexample．Theseepagefieldfeaturesunderdifferentdegreesofopeningandconnectivityarediscussed．Resultsshowthatthemeshlessmethodhascertainadvantagesinsolvingseepagefieldofintensivefractureproblem．Thelayoutindependenceofgriddingnodesonintegra
8、tionpointsisa—chieved．There—processingoffreesurfaceandsub-domainwithcrackscrossingisavoided．Theprocessofsolvingtheseepageproblemissimplified．KeywordsFracturedrock，Meshlessmethod，Anisotropy，Penaltyfunctionmethod，F(xiàn)reesurface收稿13期：2
