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1、第38卷,第5期公路工程Vo1.38,No.52013年10月HighwayEngineeringOct.,2013降雨入滲對(duì)裂隙性紅粘土邊坡的穩(wěn)定性影響分析王培清,付強(qiáng)’(1.西藏農(nóng)牧學(xué)院水利土木工程學(xué)院,西藏林芝860000;2.河海大學(xué)巖土工程研究所,江蘇南京210098;3.長(zhǎng)沙理工大學(xué),湖南長(zhǎng)沙410015)[摘要】紅粘土具有干縮開裂性,裂隙性紅粘土、尤其是高吸力紅粘土邊坡,其穩(wěn)定性跟降雨入滲有很大關(guān)系?;陲柡鸵环秋柡屯翝B流理論,建立了裂隙性高吸力紅粘土邊坡數(shù)值分析模型,模擬了降雨入滲條件下邊坡暫態(tài)滲流場(chǎng),分析了降雨強(qiáng)度、裂隙深度、裂隙滲透系數(shù)等對(duì)裂隙性紅粘土邊坡滲流場(chǎng)
2、及穩(wěn)定性的影響。結(jié)果表明,短期降雨對(duì)低滲透性紅粘土邊坡滲流影響較小,高滲透性裂隙加快了雨水人滲;土坡安全系數(shù)對(duì)雨強(qiáng)的敏感度與土體飽和滲透系數(shù)有關(guān);裂隙深度影響邊坡安全系數(shù)、滑裂面位置及形狀;隨著裂隙深度增加,邊坡安全性系數(shù)對(duì)雨強(qiáng)敏感性顯著增加,邊坡滑動(dòng)形式趨向于淺層滑動(dòng)。[關(guān)鍵詞】高吸力紅粘土;降雨人滲;裂隙;邊坡安全系數(shù);淺層滑動(dòng)[中圖分類號(hào)】U416.14.[文獻(xiàn)標(biāo)識(shí)碼】A[文章編號(hào)]1674一o61o(2013)05—0165—06.AnalysisonStabilityofRedClaywithCracksBasedonlinfallInfiltrationWANGPeiq
3、ing。FUQiang’(1.DepartmentofWaterConservancyandCivilEngineering,TibetAgriculturalandAnimalHusbandryCollegeLinzhi,Tibet860000,China;2.InstituteofGeotechnicalEngineering,HohaiUniversity,Nan—jing,Jiangsu,210098China;3.ChangshaUniversityofscience&technology,Changsha,Hunan410015。China)[Abstract]Redc
4、layhadthecharacterofdryshrinkagecrack.Therewasarelationshipbetweenthestabilityofredclaywithcrackandrainfallinfiltration,especiallyforhighsuctionredclay.Basedonthesaturated·unsaturatedseepagetheory,anumericalanalysismodelofexpansiveslopewithhighsuctionwasbuilt.Theslopetransientseepagefieldunder
5、theconditionsofrainfallinfiltrationwassimulatedalso.Theinfluenceofrainfallintensity,crackdepthandpermeabilitycoeficientofcrackonseepagefieldandsta-bilityofredclaywithcrackwasanalyzed.Itwasshowingthattheinfluenceofshort—timerainfallonslopeseepagefieldwaslower,andthecracksofhighpermeabilityspeed
6、eduprainfallinfiltration.Thesensibilityofsafetyfactorofslopesoiltorainfallintensitywasrelatedtosaturatedpermeabilitycoeffi·cient.Thesafetyfactorofslope,slidingsurfacelocationandshapeswereaffectedbycrackdepth.Withtheincreaseofcrackdepth,thesensibilityofsafetyfactorofslopesoiltorainfallintensity
7、increased.Theslidingformtendedtoshallowslide.[Keywords]highsuctionredclay;rainfallinfiltration;crack;safetyfactorofslope;shallowslide條件、土性參數(shù)等。紅粘土一般情況下為非飽1概述和的,由于基質(zhì)吸力對(duì)土體抗剪強(qiáng)度的貢獻(xiàn),土體抗紅粘土具有高液限、干縮開裂性,分布廣泛。中剪強(qiáng)度較高,土坡是穩(wěn)定的。降雨入滲在邊坡土體國(guó)西南紅粘土地區(qū)較多,雨季地