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时间:2019-05-11
《唐家山滑坡堵江机制及堰塞坝溃坝模式分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-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唐家山滑坡堵江机制及堰塞坝溃坝模式分析1,223111胡卸文,黄润秋,施裕兵,吕小平,朱海勇,汪雪瑞(1.西南交通大学土木工程学院,四川成都610031;2.成都理工大学地质灾害防治与地质灾害保护国家重点实验室,四川成都610059;3.中国水电工程顾问集团公司成都勘测设计研究院地质工程分院,四川成都610072)摘要:在对唐家山滑坡及其堰塞
2、坝现场进行详尽地质调查结果基础上,结合早期(地震前)资料开展研究,结果表明,该滑坡形成及堵江过程可概括为:顺层岸坡结构地震诱发→滑坡体前缘剪切、后缘拉裂→高速下滑、形成气浪、前缘刨蚀河床、对岸阻化隆起→后缘边坡坐落下滑→堰塞堵江。对堰塞坝体地质结构、不同水位条件下堰塞坝整体及上下游部位不同工况稳定性分析表明,堰塞坝以沟槽部位表层松散体水流逐级淘刷的“溢流破坏”方式为特点,整体溃坝可能性小。关键词:工程地质;堰塞坝;高速滑坡;堵江机制;溃坝中图分类号:P642.2文献标识码:A文章编号:1000–6915(20
3、09)01–0181–09ANALYSISOFBLOCKINGRIVERMECHANISMOFTANGJIASHANLANDSLIDEANDDAM-BREAKINGMODEOFITSBARRIERDAM1,223111HUXiewen,HUANGRunqiu,SHIYubing,LUXiaoping,ZHUHaiyong,WANGXuerui(1.SchoolofCivilEngineering,SouthwestJiaotongUniversity,Chengdu,Sichuan610031,China;2
4、.StateKeyLaboratoryofGeohazardPreventionandGeoenvironmentProtection,ChengduUniversityofTechnology,Chengdu,Sichuan610059,China;3.ChengduHydroelectricInvestigationandDesignInstitute,ChinaHydropowerEngineeringConsultingGroupCo.,Chengdu,Sichuan610072,China)Abst
5、ract:Onthebasisofthedetailedgeologicinvestigationresultswhichweregainedonthelocationofthebarrierdam,combiningtheearlyinformationbeforeearthquake,theformingprocessandblockingrivermechanismofthelandslidecanbesummarizedasfollows:(1)therewereshearingsurfaceinfo
6、rwardedgeofthelandslideondipslopewhichwascausedbyearthquakeanddrawingopeninbackedge;(2)theairwavewasformedbythehighspeedsliding,andtheriverbedwasploughedbyitsforwardedge,andthethitherslopewasupliftedforinhibition;(3)thebackedgeofthelandslidestoodandglided;a
7、nd(4)thenitdammedandblockedriver.Meanwhile,accordingtothegeologicalstructureanddifferentwaterlevelsofthebarrierdam,thebarrierdamsstabilitiesinupstreamanddownstreamarestudied.Itisshownthatthescouringmodeofthebarrierdamisoverflowbreakdownmechanismwhichstepwi
8、sescoursthesurfacelayerofloosemediaonthegrooveposition,andthepossibilityofdam-breakingissmall.Keywords:engineeringgeology;barrierdam;highspeedlandslide;blockingrivermechanism;dam-breaking收稿日期:2008–07–1
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