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时间:2017-11-30
《唐家山堰塞湖大水沟泥石流发育特征及堵江危害性评价》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4期岩石力学与工程学报Vol.28No.42009年4月ChineseJournalofRockMechanicsandEngineeringApril,2009唐家山堰塞湖大水沟泥石流发育特征及堵江危害性评价1,212311胡卸文,吕小平,黄润秋,施裕兵,刘娟,李仰波(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.中国水电顾问集团成都勘测设计研究院,四川成都610072)摘要:大水沟位于唐家山上游侧,“5.12”地震前为一条小山洪
2、冲沟,震后由于沟域内崩塌、滑坡发育,形成极为丰富的松散物源,具备发生泥石流的所有条件,也成为唐家山堰塞湖成功泄水处理后,仍对堰塞湖正常利用起控制作用的严重地质灾害隐患点之一。通过现场实地调查,在查明沟域内松散物源分布及稳定性基础上,结合6.14泥石流发育状况,系统对大水沟泥石流发育特征及其动力学特性,尤其对在不同降雨频率下可能形成的泥石流规模进行分析研究,并对唐家山堰塞湖泄水口部位堵江规模、持续时间、溃决方式及其可能带来的危害性进行评价。分析计算结果已被2008年9月24日发生的百年一遇的泥石流所证实。关键词:工程地质;唐家山堰塞
3、湖;大水沟;泥石流;堵江中图分类号:P642文献标识码:A文章编号:1000–6915(2009)04–0850–09DEVELOPMENTALFEATURESANDEVALUATIONOFBLOCKINGDANGERSOFDASHUIDITCHDEBRISFLOWINTANGJIASHANDAMMEDLAKE1,212311HUXiewen,LUXiaoping,HUANGRunqiu,SHIYubing,LIUJuan,LIYangbo(1.SchoolofCivilEngineering,SouthwestJiaotongU
4、niversity,Chengdu,Sichuan610031,China;2.StateKeyLaboratoryofGeohazardPreventionandGeoenvironmentProtection,ChengduUniversityofTechnology,Chengdu,Sichuan610059,China;3.ChengduHydroelectricInvestigationandDesignInstitute,ChinaHydropowerConsultingGroupCorporation,Chengdu
5、,Sichuan610072,China)Abstract:DashuiDitchislocatedintheupstreamsideofTangjiashanMountain.ItwasagullybeforetheMay12earthquake,however,extremelyrichloosesourceswereformedwithallconditionsoftheoccurrenceofadebrisflowduetothecollapsesandlandslidesaftertheearthquake.Itbeca
6、meoneoftheseriouspotentialdangersofgeologicaldisastersaftersuccessfuldischargeofTangjiashandammedlake,whichcontrolledthenormaloperationofTangjiashandammedlakeaswell.Throughin-situinvestigation,thedevelopmentalanddynamicfeaturesofDashuiDitchdebrisflowwasanalyzedsystema
7、ticallycombiningwiththedevelopmentalsituationofdebrisflowonJune14onthebasisofidentifyingthedistributionandstabilityofthegrooveloosesources.Inparticular,thepossiblesizesofthedebrisflowunderdifferentrainfrequencieswerestudied,andthepossibleblockingsize,durationandoutbur
8、stformswereevaluated.Theresultswereconfirmedbytheoncein100-yeardebrisflowon收稿日期:2008–10–27;修回日期:2008–12–19基金项目:国家自然科学基金资助项目(
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