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1、JournalofEngineeringGeology工程地質(zhì)學(xué)報(bào)1004-9665/2014/22(3)一0396.09DOI:10.13544/j.cnki.jeg.2014.03.007貴州省岑鞏縣大榕滑坡特征及形成機(jī)制研究冰林鋒王茜葛海龍?jiān)x張維順(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(成都理工大學(xué))成都610059)摘要2012年6月29日,岑鞏縣思餳鎮(zhèn)大榕村突發(fā)大型滑坡災(zāi)害,約310x10in。大榕滑坡為古滑坡堆積區(qū)失穩(wěn)?;诨缕茐奶卣鞣治龊偷刭|(zhì)原型分析,定性判斷滑坡失穩(wěn)模式為蠕滑一拉裂
2、一牽引式滑移?;聠?dòng)區(qū)在不合理人工填土及強(qiáng)降雨作用下,坡腳蠕滑并發(fā)展為失穩(wěn),由此導(dǎo)致主滑區(qū)坡腳支撐作用明顯減弱,主滑區(qū)中下部因此滑移失穩(wěn),并牽引右側(cè)主滑體中上部坡體逐步失穩(wěn)?;瑤е饕挥谙路鼜?qiáng)風(fēng)化基巖中。主滑體左側(cè)向西滑移,右側(cè)主體向SW向滑移?;跐B流場(chǎng)一應(yīng)力場(chǎng)耦合數(shù)值分析,再現(xiàn)了滑坡失穩(wěn)過(guò)程及發(fā)生機(jī)理。大榕滑坡形成機(jī)制深入研究對(duì)于西部山區(qū)類似滑坡分析及識(shí)別具有重要的參考價(jià)值。關(guān)鍵詞大榕滑坡古滑坡堆積體啟動(dòng)區(qū)失穩(wěn)模式耦合分析中圖分類號(hào):P642.22文獻(xiàn)標(biāo)識(shí)碼:ACHARACTERISTICANDME
3、CHANISMoFDARoNGLANDSLIDEINCENGoNGCoUNTY.GUIZHOUPRoVINCELINFengWANGQianGEHailongZENGHuiZHANGWeishun(StateKeyLaboratoryofGeohazardPreventionandGeoenvironmentProtection,ChengduUniversityofTechnology,Chengdu610059)AbstractAlarge—scalelandslidedisasterofabout3
4、.1millionmhappenedinDarongvillageofSiyangtown,CengongcountryonJune29,2012.Daronglandslideisintheaccumulationzoneofancientlandslide.Basedontheanalysisoffailurecharacteristicsandgeologicalprototypeoflandslide,thefailuremodeisqualitativelyjudgedascreepslidin
5、g—fracturing—tractionsliding.Undertheactionofunreasonableartificialfilledsoilinlandslidepromoterregionandheavyrainfall,thebaseofslopehadcreepdeformationandbecameunstable,whichweakenedthesupportingforceinthebaseofslopeofthemainslidearea.Consequently,slidin
6、gandinstabilityhappenedinthelowerpartofthemainslidearea,whichthusinducedtheupperrightsideofthemainslidetobegraduallyunstable.Slipzoneislocatedinhighlyweatheredbedrockunderlying.Theleftsideofthemainbodyslippedtowest,andtherightoneslippedtosouthwest.Basedon
7、couplednumericalanalysisofstressfieldandseepagefield,theinstabilityprocessandgenerationmechanismofthelandslidearereappeared.ThestudyonformationmechanismofDaronglandslideprovidesanimportantreferenceforanalogouslandslideanalysisandidentificationinwesternmou
8、ntains.KeywordsDaronglandslide,Ancientlandslideaccumulation,Promoterregion,Instabilitymode,Couplinganalysis收稿日期:2014—03一o4;收到修改稿日期:2014—05一l1.基金項(xiàng)目:973計(jì)劃項(xiàng)目(2013CB733201)資助.第一作者簡(jiǎn)介:林鋒,男,博士,教授,主要從事地質(zhì)工程專業(yè)的科研和教學(xué)工作.Email:l