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时间:2020-03-26
《红石河堰塞湖漫顶溃坝风险评估.pdf》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、JournalofEngineeringGeology工程地质学报1004—9665/2009/17(1)-0050-06红石河堰塞湖漫顶溃坝风险评估常东升①②张利民①徐耀①黄润秋②(①香港科技大学土木与环境工程系香港)(②成都理工大学地质灾害防治与地质环境保护国家重点实验室成都610059)摘要四川省青川县红石河堰塞湖是2008年5月12日汶川大地震形成的34座大型堰塞湖之一,是由东河口滑坡堵塞红石河形成的。该堰塞体高度约50m、宽度约250in、顺河向长度约5001171、形成的最大库容约400万m。本文作者对红石河堰塞体做了较详尽的现场试验,包括土的冲蚀试验、土的基本物性试验等。基
2、于现场试验数据,对土的冲蚀性和漫顶溃坝风险做了详细的分析。结果显示,从土的抗冲蚀性角度考虑,只要有水溢出就会有土体被冲蚀,这说明红石河堰塞体的漫顶溃决可能性较高。本文还提出经验公式来预测红石河堰塞体漫顶的溃决时间,大约为4.5d,如果考虑到大石块对抗冲蚀稳定性的有利影响,这一数值会增大。此外,还研究了溃决深度随时问的变化规律。关键词汶川地震堰塞湖漫顶溃坝冲蚀风险分析中图分类号:P642文献标识码:AANALYSIS0F0VERToPPINGFAILUREoFHoNGSHIHELANDSLII)EDAMAFTERWENCHUANEARTHQUAKECHANGDongsheng①②ZHANG
3、Limin①XUYao①HUANGRunqiu②((!)DepartmentofCivilandEnvironmentalEngineering,HongKongUniversityofScienceandTechnology,HongKong)(~State研LaboratoryofC.eohazardPreventionandC-eoenvironmentProtection,ChengduUniversityofTechnology,Chengdu610059)AbstractTheHongshihelandslidedam,locatedatQingchuanCounty,Sic
4、huanProvince,isoneofthe34large—scalelandslidedamsinducedbytheGreatWenchuanEarthquakeonMay12,2008.TheHongshiRiverwasblockedbytheDonghekouLandslide.ThelandslidedebrisformedtheHongshihelandslidedamapproximately50minheight,250minwidth,500minlengthalongtheriver.Thedamreservoircapacitywasestimatedtobe6
5、×10m.FieldtestswereconductedattheHongshihelandslidedamafteritsbreaching.Thetestsincludesoilerod—ibilitytests.andbasicsoilpropertytests.Basedoninsitusoilerosionresistancedata,thebreachingfailureriskwasstudied.Itisshownthatthelandslidesoilscanbeerodedaslongasthereisoverflow,whichmeanstheovertopping
6、breachingfailureriskoftheHongshihelandslidedamisquitehigh.Moreover,thebreachingtimeisevaluatedbasedonnewlyintroducedempiricalequationsandisabout4.5days.Asthepresenceofbouldersisnotincludedintheanalysis.theactualfailuretimecouldbelongerthanourestimation.Thetrendofsoilerosiondepthwithtimeisalsoinve
7、stigated.Themethodologypresentedinthepapermayprovidesomeguidanceinhandlingsimilarinci。收稿日期:2008—12~15;收到修改稿日期:2009一Ol一05.基金项目:本项研究受国家重点基础研究发展计划(973计划)课题“强震作用下斜坡失稳破坏机理及分布规律”(2008CB425801);地质灾害防治与地质环境保护国家重点实验室“科技减灾、重建家园”
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