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(2009)01–0181–09ANALYSISOFBLOCKINGRIVERMECHANISMOFTANGJIASHANLANDSLIDEANDDAM-BREAKINGMODEOFITSBARRIERDAMHUXiewen1，2，HUANGRunqiu2，SHIYubing3，LUXiaoping1，ZHUHaiyong1，WANGXuerui1(1.SchoolofCivilEngineering，SouthwestJiaotongUniversity，Chengdu，Sichuan610031，China；2.StateKeyLaboratoryofGeohazardPreventionandGeoenvironmentProtection，ChengduUniversityofTechnology，Chengdu，Sichuan610059，China；3.ChengduHydroelectricInvestigationandDesignInstitute，ChinaHydropowerEngineeringConsultingGroupCo.，Chengdu，Sichuan610072，China)Abstract：Onthebasisofthedetailedgeologicinvestigationresultswhichweregainedonthelocationofthebarrierdam，combiningtheearlyinformationbeforeearthquake，theformingprocessandblockingrivermechanismofthelandslidecanbesummarizedasfollows：(1)therewereshearingsurfaceinforwardedgeofthelandslideondipslopewhichwascausedbyearthquakeanddrawingopeninbackedge；(2)theairwavewasformedbythehighspeedsliding，andtheriverbedwasploughedbyitsforwardedge，andthethitherslopewasupliftedforinhibition；(3)thebackedgeofthelandslidestoodandglided；and(4)thenitdammedandblockedriver.Meanwhile，accordingtothegeologicalstructureanddifferentwaterlevelsofthebarrierdam，thebarrierdamsstabilitiesinupstreamanddownstreamarestudied.Itisshownthatthescouringmodeofthebarrierdamisoverflowbreakdownmechanismwhichstepwisescoursthesurfacelayerofloosemediaonthegrooveposition，andthepossibilityofdam-breakingissmall.Keywords：engineeringgeology；barrierdam；highspeedlandslide；bl