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1、ADissertationSubmittedinPartialFulfillmentoftheRequirementsfortheDegreeofMasterinEngineeringSlopeStabilityAnalysisBasedOnTheCoupledActionOfSeepageAndStressMasterCandidate:YeJianMajor:MiningEngineeringSupervisor:Prof.ShengJianlongWuhanUniversityofScienceandTechnologyWuhan,Hubei4300
2、81,P.R.ChinaMay24,2015摘要隨著國(guó)家對(duì)基礎(chǔ)建設(shè)投資的加大,大量巖土工程問(wèn)題隨之涌現(xiàn)。其中,邊坡與基坑的穩(wěn)定性問(wèn)題更加突出。特別是沿海地區(qū),工程巖土體受地下水滲流的影響,大量邊坡失穩(wěn)事故的產(chǎn)生都是由于地下水的作用。研究地下水滲流對(duì)邊坡穩(wěn)定性的影響有較大的實(shí)際意義。選取邊坡的典型剖面,運(yùn)用FLAC3D軟件進(jìn)行建模與計(jì)算,通過(guò)應(yīng)力和位移云圖分析邊坡穩(wěn)定性情況。通過(guò)改變地下水位,計(jì)算分析邊坡穩(wěn)定性變化情況,探討地下水對(duì)邊坡的影響機(jī)理和作用效果?;讦卸ɡ砗蛷?qiáng)度折減法理論,分別計(jì)算邊坡在不同參數(shù)組合下的安全系數(shù),分析巖土體強(qiáng)度參數(shù)的變化對(duì)邊坡穩(wěn)定
3、性的影響,并建立安全系數(shù)與各影響因素之間的π參數(shù)形式函數(shù)關(guān)系;結(jié)果表明,巖土體強(qiáng)度參數(shù)中,粘聚力和內(nèi)摩擦角對(duì)邊坡的安全系數(shù)影響比抗拉強(qiáng)度明顯。以廣州某基坑邊坡工程實(shí)例為研究對(duì)象,建立三維模型,計(jì)算分析邊坡在無(wú)水干燥、滲流應(yīng)力不耦合與滲流應(yīng)力耦合三種工況下的穩(wěn)定性情況;得出三種工況下的基坑邊坡安全系數(shù)分別為1.7,1.4和1.1,說(shuō)明地下水和邊坡應(yīng)力場(chǎng)耦合作用對(duì)邊坡的穩(wěn)定性影響明顯,在分析討論含水邊坡的穩(wěn)定性問(wèn)題時(shí),考慮地下水與邊坡的耦合作用十分必要;為類(lèi)似工程邊坡穩(wěn)定性分析提供借鑒。關(guān)鍵詞:邊坡;數(shù)值模擬;π定理;滲流;耦合分析IAbstractWitht
4、heincreaseofnationalinvestmentininfrastructure,largenumberofgeotechnicalproblemsappear.Amongthem,thestabilityproblemofslopeandfoundationpitisparticularlyevident.Especiallyinthecoastalareas,rockandsoilisaffectedbygroundwaterseepage,alotofslopeinstabilityaccidentsareduetotheactionof
5、groundwater.Thereisgreatpracticalsignificancetoresearchtheeffectofgroundwaterseepageonslopestability.ThedissertationselectsatypicalprofileofslopeasanexampleandusesthesoftwareFLAC3Dtomodelandcalculateit,analyzestheconditionofslopestabilitybythecloudofstressanddisplacement.Bychangin
6、gtheundergroundwaterlevel,exploresthemechanismofgroundwateronslopebythechangeofslopestabilitycircumstances.Basedontheπtheoremandstrengthreductionmethod,thepapercalculatesthesafetyfactoroftheslopeunderdifferentcombinationsoftheparameters,analyzestheinfluenceofthestrengthparameterso
7、frockandsoilontheslopestability,andestablishesafunctionofπparametersbetweensafetyfactorandinfluencingfactors.Theresultsshowthat,intheserockandsoilstrengthparameters,theinfluenceofcohesionandfrictiononthesafetyfactorismoreobviousthantensilestrength.Thedissertationtakesafoundationpi
8、tslopeinGuangzhouastheresearchobj