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1、第36卷第9期人民黃河Vol.36,No.92014年9月YELLOWRIVERSep.,2014【工程勘測設(shè)計(jì)】降雨作用下非飽和土邊坡水力耦合過程分析李濱鍔1,吳禮舟1,晏和開2,馮少真3(1.成都理工大學(xué)地質(zhì)災(zāi)害防治與地質(zhì)環(huán)境保護(hù)國家重點(diǎn)實(shí)驗(yàn)室,四川成都610059;2.云南省143煤田地質(zhì)勘查隊(duì),云南昆明655000;3.廣東省安全科學(xué)技術(shù)研究所,廣東廣州510620)摘要:基于滲流理論、彈性理論及VG土-水特征曲線模型,建立了二維非飽和土滲流-變形耦合控制方程組。該控制方程突破了飽和時(shí)滲透系數(shù)是常數(shù)的局限,適用于任意初始條件和降雨條件的土坡穩(wěn)定性
2、分析。有限元軟件COMSOLMultiphysics能根據(jù)已建好的非飽和土坡滲流-變形耦合模型開展分析。通過算例分析了非飽和土降雨入滲過程中滲流-變形的耦合效應(yīng),并探討了考慮飽和滲透系數(shù)為變量情況以及不同的初始條件對(duì)滲流場和應(yīng)力場的影響。結(jié)果表明:在非飽和土坡降雨入滲過程中滲流-變形的耦合效應(yīng)是非常顯著的,且與時(shí)間有關(guān)。對(duì)于濕陷性土,考慮耦合效應(yīng)的壓力水頭變化總是慢于非耦合情況。飽和狀態(tài)時(shí)滲透系數(shù)是應(yīng)變的函數(shù),其值的變化對(duì)非飽和土邊坡滲流場有一定的影響,但對(duì)非飽和土邊坡變形影響微弱。初始條件對(duì)滲流和變形的影響是非常大的。關(guān)鍵詞:非飽和土邊坡;滲流-變形
3、耦合;降雨入滲;數(shù)值分析中圖分類號(hào):TU46;P642.22文獻(xiàn)標(biāo)志碼:Adoi:10.3969/j.issn.10001379.2014.09.034AnalysisofHydroMechanicalProcessinUnsaturatedSoilSlopeduetoRainfallInfiltration1123LIBine,WULizhou,YANHekai,FENGShaozhen(1.StateKeyLaboratoryofGeologicalHazardPreventionandGeologicalEnvironmentProte
4、ction,ChengduUniversityofTechnology,Chengdu610069,China;2.No.143CoalGeologicalExplorationTeamofYunnan,Kunming655000,China;3.SafetyScienceandTechnologyResearchInstituteofGuangdong,Guangzhou510620,China)Abstract:Basedontheseepagetheory,elastictheoryandthesoilwatercharacteristiccur
5、vefromVG,thetwodimensionalhydromechanicalmodelinunsaturatedmediumwasestablished.Themodelcouldconsidernotonlythevariationofthecoefficientofpermeabilityatsaturation,butalsoanyinitialconditionsandrainfallboundaries.ThefiniteelementsoftwareCOMSOLMultiphysicscouldanalyzetheunsatura
6、tedcoupledseepagedeformationequationsthathadbeenestablished.Thecouplingeffectofthemodelwasanalyzedthroughcases.Andtheinfluenceofthesituationthatthecoefficientofpermeabilityatsaturationwaschangedanddifferentinitialconditionstotheseepagefieldandstressfieldwerestudied.Theresultssh
7、owthat:thecouplingeffectisverysignificantinunsaturatedsoilslopeduringrainfallinfiltrationandistimerelated.Tothecollapsiblesoil,thechangingofpressureheadofcoupledconditionsisalwaysslowerthantheuncoupledconditions.Thecoefficientofpermeabilityatsaturationisnotconstantandchangingwith
8、thesoilstrain,whichhasaneffectonrainfall