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时间:2020-03-26
《贵州省岑巩县大榕滑坡特征及形成机制研究.pdf》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、JournalofEngineeringGeology工程地质学报1004-9665/2014/22(3)一0396.09DOI:10.13544/j.cnki.jeg.2014.03.007贵州省岑巩县大榕滑坡特征及形成机制研究冰林锋王茜葛海龙曾辉张维顺(地质灾害防治与地质环境保护国家重点实验室(成都理工大学)成都610059)摘要2012年6月29日,岑巩县思饧镇大榕村突发大型滑坡灾害,约310x10in。大榕滑坡为古滑坡堆积区失稳。基于滑坡破坏特征分析和地质原型分析,定性判断滑坡失稳模式为蠕滑一拉裂
2、一牵引式滑移。滑坡启动区在不合理人工填土及强降雨作用下,坡脚蠕滑并发展为失稳,由此导致主滑区坡脚支撑作用明显减弱,主滑区中下部因此滑移失稳,并牵引右侧主滑体中上部坡体逐步失稳。滑带主要位于下伏强风化基岩中。主滑体左侧向西滑移,右侧主体向SW向滑移。基于渗流场一应力场耦合数值分析,再现了滑坡失稳过程及发生机理。大榕滑坡形成机制深入研究对于西部山区类似滑坡分析及识别具有重要的参考价值。关键词大榕滑坡古滑坡堆积体启动区失稳模式耦合分析中图分类号:P642.22文献标识码: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.基金项目:973计划项目(2013CB733201)资助.第一作者简介:林锋,男,博士,教授,主要从事地质工程专业的科研和教学工作.Email:l
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