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ID:37678338
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时间:2019-05-28
《降雨特性对土质边坡失稳的影响_林鸿州》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第28卷第1期岩石力学与工程学报Vol.28No.12009年1月ChineseJournalofRockMechanicsandEngineeringJan.,2009降雨特性对土质边坡失稳的影响1,2331,2林鸿州,于玉贞,李广信,彭建兵(1.长安大学西部矿产与地质工程教育部重点实验室,陕西西安710054;2.长安大学国土资源部岩土工程开放研究实验室,陕西西安710054;3.清华大学水沙科学与水利水电工程国家重点实验室,北京100084)摘要:通过降雨诱发土质边坡失稳的模型试验及已有研究成果来探讨降雨特性对边坡失稳的
2、影响,并以此来选取出合适的雨量预警参数。研究结果表明:高强度降雨较易使边坡产生流滑破坏且冲蚀现象较为明显;而低雨强长历时的降雨较易使边坡深层土体的孔隙水压力增加,因此较易产生滑动型破坏且滑坡体的规模也较大;此外,降雨型滑坡存在“门槛累积雨量”。该研究成果揭示了降雨入渗对边坡稳定性的作用机制,并以此建议采用降雨强度与累积雨量作为雨量预警基准所需的参数,其中降雨强度参数可用时雨量表示,时雨量可用以衡量流滑型滑坡和泥石流灾害,而累积雨量则有助于评估滑动型滑坡的灾害。关键词:工程地质;滑坡;泥石流;入渗;降雨特性;雨量预警基准中图分类
3、号:P642.2文献标识码:A文章编号:1000–6915(2009)01–0198–07INFLUENCEOFRAINFALLCHARACTERISTICSONSOILSLOPEFAILURE1,2331,2LINHungchou,YUYuzhen,LIGuangxin,PENGJianbing(1.KeyLaboratoryofWesternGeologicalResourcesandGeologicalEngineeringofMinistryofEducation,Chang′anUniversity,Xi′an,Sh
4、aanxi710054,China;2.OpenResearchLaboratoryofGeotechnicalEngineering,MinistryofLandResources,Chang′anUniversity,Xi′an,Shaanxi710054,China;3.StateKeyLaboratoryofHydroscienceandEngineering,TsinghuaUniversity,Beijing100084,China)Abstract:Rainfallearlywarningcriterionisa
5、usefultoolforrainfall-inducedlandslidemitigation.Unfortunately,itishardtobeusedeffectivelyinpracticeowingtothecomplexitybetweenrainfallinfiltrationeffectsandslopestability.Hence,thelandslidemodeltestforsoilslopeandpreviousresearchresultsareusedtostudytheinfluenceofr
6、ainfallcharacteristicsonsoilslopefailure.Theresultsshowthatfluidizedlandslideandsoilerosionwillbetriggeredbyhighintensityrainfalleasily;andtheporewaterpressureinthedeepsoilofslopewillincreaseeasilyunderthelongdurationrainfallwithlowintensity;andthelandslidemagnitude
7、whichistriggeredbythelongdurationrainfallwithlowintensitywillbelargerthanthattriggeredbyhighintensityrainfall.Besides,thethresholdaccumulativerainfallisanimportantfactorofrainfall-inducedlandslide.Moreover,itissuggestedthattherainfallintensityandaccumulativerainfall
8、areeffectiveparametersinrainfallearlywarningcriterion.Therainfallintensitycanberepresentedbytherainfallamountperhour,whichcanpredictfluidi
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