資源描述:
《降雨特性對土質(zhì)邊坡失穩(wěn)的影響》由會員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、第28卷第1期巖石力學(xué)與工程學(xué)報(bào)Vol.28No.12009年1月ChineseJournalofRockMechanicsandEngineeringJan.,2009降雨特性對土質(zhì)邊坡失穩(wěn)的影響1,2331,2林鴻州,于玉貞,李廣信,彭建兵(1.長安大學(xué)西部礦產(chǎn)與地質(zhì)工程教育部重點(diǎn)實(shí)驗(yàn)室,陜西西安710054;2.長安大學(xué)國土資源部巖土工程開放研究實(shí)驗(yàn)室,陜西西安710054;3.清華大學(xué)水沙科學(xué)與水利水電工程國家重點(diǎn)實(shí)驗(yàn)室,北京100084)摘要:通過降雨誘發(fā)土質(zhì)邊坡失穩(wěn)的模型試驗(yàn)及已有研究成果來探討降雨特性對邊坡失穩(wěn)的影響,并以此來選取出合
2、適的雨量預(yù)警參數(shù)。研究結(jié)果表明:高強(qiáng)度降雨較易使邊坡產(chǎn)生流滑破壞且沖蝕現(xiàn)象較為明顯;而低雨強(qiáng)長歷時(shí)的降雨較易使邊坡深層土體的孔隙水壓力增加,因此較易產(chǎn)生滑動(dòng)型破壞且滑坡體的規(guī)模也較大;此外,降雨型滑坡存在“門檻累積雨量”。該研究成果揭示了降雨入滲對邊坡穩(wěn)定性的作用機(jī)制,并以此建議采用降雨強(qiáng)度與累積雨量作為雨量預(yù)警基準(zhǔn)所需的參數(shù),其中降雨強(qiáng)度參數(shù)可用時(shí)雨量表示,時(shí)雨量可用以衡量流滑型滑坡和泥石流災(zāi)害,而累積雨量則有助于評估滑動(dòng)型滑坡的災(zāi)害。關(guān)鍵詞:工程地質(zhì);滑坡;泥石流;入滲;降雨特性;雨量預(yù)警基準(zhǔn)中圖分類號:P642.2文獻(xiàn)標(biāo)識碼:A文章編號:10
3、00–6915(2009)01–0198–07INFLUENCEOFRAINFALLCHARACTERISTICSONSOILSLOPEFAILURE1,2331,2LINHungchou,YUYuzhen,LIGuangxin,PENGJianbing(1.KeyLaboratoryofWesternGeologicalResourcesandGeologicalEngineeringofMinistryofEducation,Chang?anUniversity,Xi?an,Shaanxi710054,China;2.OpenResearchL
4、aboratoryofGeotechnicalEngineering,MinistryofLandResources,Chang?anUniversity,Xi?an,Shaanxi710054,China;3.StateKeyLaboratoryofHydroscienceandEngineering,TsinghuaUniversity,Beijing100084,China)Abstract:Rainfallearlywarningcriterionisausefultoolforrainfall-inducedlandslidemitiga
5、tion.Unfortunately,itishardtobeusedeffectivelyinpracticeowingtothecomplexitybetweenrainfallinfiltrationeffectsandslopestability.Hence,thelandslidemodeltestforsoilslopeandpreviousresearchresultsareusedtostudytheinfluenceofrainfallcharacteristicsonsoilslopefailure.Theresultsshow
6、thatfluidizedlandslideandsoilerosionwillbetriggeredbyhighintensityrainfalleasily;andtheporewaterpressureinthedeepsoilofslopewillincreaseeasilyunderthelongdurationrainfallwithlowintensity;andthelandslidemagnitudewhichistriggeredbythelongdurationrainfallwithlowintensitywillbelar
7、gerthanthattriggeredbyhighintensityrainfall.Besides,thethresholdaccumulativerainfallisanimportantfactorofrainfall-inducedlandslide.Moreover,itissuggestedthattherainfallintensityandaccumulativerainfallareeffectiveparametersinrainfallearlywarningcriterion.Therainfallintensitycan
8、berepresentedbytherainfallamountperhour,whichcanpredictfluidi