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1、第12卷第2期南水北調(diào)與水利科技V01.12No.22014年4月South-to—NorthWaterTransfersandWaterScience&TechnologyApr.2014DOI:10.13476/j.cnki.nsbdqk.2014.02.024都江堰市龍池鎮(zhèn)李泉太溝泥石流災(zāi)害研究廖彬,常鳴(1.四川省投資集團(tuán)有限責(zé)任公司,成都610015;2.成都理工大學(xué)地質(zhì)災(zāi)害防治與地質(zhì)環(huán)境保護(hù)國(guó)家重點(diǎn)實(shí)驗(yàn)室,成都610059)摘要:“5·12”汶川地震后,位于地震災(zāi)區(qū)的四川都江堰龍池鎮(zhèn)暴發(fā)了群發(fā)性
2、泥石流,給災(zāi)后重建工作帶來(lái)很大的難度。選擇其中的李泉太溝泥石流作為研究對(duì)象,通過(guò)野外調(diào)查、室內(nèi)分析和泥石流靜動(dòng)力學(xué)參數(shù)計(jì)算,如屈服應(yīng)力、流量、容重、沖出總量等計(jì)算,認(rèn)為地震產(chǎn)生的大量崩滑體為泥石流提供了直接物源,在暴雨條件下非常容易導(dǎo)致泥石流的產(chǎn)生;另外溝道陡峭、流量大、暴發(fā)隱蔽是李泉太泥石流的主要特征;李泉太泥石流的容重較大,屈服應(yīng)力較大,不僅能夠摧毀公路等基礎(chǔ)設(shè)施,還能夠造成堵江等次生災(zāi)害。根據(jù)研究結(jié)果,建議重點(diǎn)敏感地區(qū)采取相應(yīng)的工程措施,并且充分利用降雨閾值,對(duì)李泉太泥石流進(jìn)行監(jiān)測(cè)預(yù)警。關(guān)鍵詞:降雨;
3、泥石流;地震;都江堰中圖分類號(hào):P642.23文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1672—1683(2014)O2一O1O2-05CharacteristicsofDebrisFlowHazardoftheLiquantaiGullyinLongchiTownofDujiangyanCounty,SichuanProvinceIdAOBin,CHANGMing~(1.SichuaninvestmentgroupcompanyofLTD,Chengdu610015,China.厶2.StateKey-Laborator
4、yforGeo-HazardPreventionandGeo-EnvironmentProtection,ChengduUniversityofTechnology,Ch'engdu610059,China)Abstract:AftertheMay12thWenchuanEarthquake,therainstormcausedthegroupdebrisflowhazardsinLongehiTownofDujiangyanCounty,SichuanProvince,whichbroughtalotof
5、difficultytOthepost-disasterreconstructionwork.TheLiquantaigullydebrisflowlocatedinLongchitownwasselectedinthestudy,anditscharacteristicsweredeterminedthroughthefieldin—vestigation,laboratoryanalysis,andcalculationofstaticanddynammparametersofdebrisflowsuc
6、hasthestressyield,flowrate,bulkdensity,andtotaloutflow.Theresultsshowedthat(1)theWenchuanEarthquakegeneratedlotsoflandslides,whichwerethesupplyfordebrisflow,especiallyunderrainstormconditions;(2)theLiquantaigullydebrisflowhadthefeaturessuchassteepchannel,l
7、argeflow,andconcealedoccurrence;and(3)thebulkdensityandstressyieldoftheLiquantaigullydebrisflowwerelarge,whichcannotonlycausedamagestOtheinfrastructurebutalsogeneratesecondarydisastersuchasblockingriver.TheresultsindicatedthattheengineeringmeasuresneedtObe
8、performedattheelevationrangeof1400tO1600m,andthethresholdvalueofprecipitationwasusedforthemonitoringandearly-warningoftheLiquantaigullydebrisflow.Keywords:rainfall;debrisflow;earthquake;Dujiangyan2010年8月12~14