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时间:2020-03-23
《地震诱发滑坡复活机制的FLAC 3D数值模拟分析.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—9665/2010/18(3)一0305—07地震诱发滑坡复活机制的FLAC3D数值模拟分析术夏敏①任光明①郭亚莎②吕生弟③刘荣清③(①成都理工大学地质灾害防治与地质环境保护国家重点实验室成都610059)(②成都理工大学信息工程学院成都610059)(③中国水电顾问集团西北勘测设计研究院西安710050)摘要地震是影响斜(边)坡、滑坡稳定性的主要因素之一。白龙江上某大型滑坡经顺层斜坡发生倾倒变形而成,天然状态下处于基本稳定状态,在
2、“5.12汶川地震作用下,该滑坡有整体复活迹象,其后缘周界形成了连续贯通的拉裂缝、错动台阶,尤其是滑坡下游区变形拉裂较明显。本文以该滑坡在地震作用下发生复活为例,在分析滑坡所处的区域地质条件的基础上,详细研究了滑坡的基本特征以及地震作用导致滑坡复活的现象、特征,然后利用FLAC如软件内置动力分析模块对该滑坡复活机制进行了分析、研究。数值分析表明,地震作用下滑坡变形破坏受坡体形态的影响较显著,滑坡对地震波具有明显的放大效应;同一地震动条件下,滑坡体相对周边处于稳定状态基岩边坡对地震更为敏感。这较好地解释了“5
3、.12汶川地震作用下,该滑坡的复活原因。关键词地震滑坡稳定性FLAC中图分类号:P642.22文献标识码:AFLACDNUMERICALSIMULATIONoFRECURRENCEMECHANISMOFLANDSLIDEUNDEREARTHQUAKELOADINGXIAMin①RENGuangming①GUOYasha②LVShengdi③LIURongqing③(4、ngduUnwe~ityofTechnology,Chengdu610059)((~CollegeofinformationEngineenngofChengduUniversityofTechnology,Chengdu610059)(~NorthwestInvestigationDesignandResearchInstitute,CHEEC,Xian710065)AbstractEarthquakeiSoneofthemainfactorstoafectthestabilityofslopesorla5、ndslides.ThehugelandslideonBailongjiangwasformedintopplingdeformationofthebeddingslope.Itwasinastablestateundernaturalcondi—tions.Afterthe5.12WenchuanEa~hquake,thehugelandslideappearedmovingphenomenaincludingcontinuouslinkingcrackanddislocationstepsinthetr6、ailingedgeoflandslide.Especially,therupturedeformationoftheland—slidedownstreamareatendedtobeevident.Thispaperexaminestherecurrencemechanismofthehugelandslideundertheearthquake.Itisbasedontheregionalgeologicalconditionsoflandslide.Itinvestigatesthebasicfea7、turesindetailandtherecurrencephenomenonandthecharacteristicsoflandslide.ItiSaccomplishedadynamicanalysisoflandsliderecurrencewiththesoftwarebuilt.inmoduleFLAC.Thenumericalsimulationandanalysisshowthat—thedeformationanddamageofthelandslideisafecteddeeplybyt8、errainunderearthquakeloading.Thelandslidehasanobviousamplificationeffectundertheactionoftheseismicwaves.Comparedwiththesteadyrockslopeadia.$收稿日期:2009—11-10;收到修改稿日期:2010-03-08.第一作者简介:夏敏,研究方向为岩土体稳定性及工程效应.Email:
4、ngduUnwe~ityofTechnology,Chengdu610059)((~CollegeofinformationEngineenngofChengduUniversityofTechnology,Chengdu610059)(~NorthwestInvestigationDesignandResearchInstitute,CHEEC,Xian710065)AbstractEarthquakeiSoneofthemainfactorstoafectthestabilityofslopesorla
5、ndslides.ThehugelandslideonBailongjiangwasformedintopplingdeformationofthebeddingslope.Itwasinastablestateundernaturalcondi—tions.Afterthe5.12WenchuanEa~hquake,thehugelandslideappearedmovingphenomenaincludingcontinuouslinkingcrackanddislocationstepsinthetr
6、ailingedgeoflandslide.Especially,therupturedeformationoftheland—slidedownstreamareatendedtobeevident.Thispaperexaminestherecurrencemechanismofthehugelandslideundertheearthquake.Itisbasedontheregionalgeologicalconditionsoflandslide.Itinvestigatesthebasicfea
7、turesindetailandtherecurrencephenomenonandthecharacteristicsoflandslide.ItiSaccomplishedadynamicanalysisoflandsliderecurrencewiththesoftwarebuilt.inmoduleFLAC.Thenumericalsimulationandanalysisshowthat—thedeformationanddamageofthelandslideisafecteddeeplybyt
8、errainunderearthquakeloading.Thelandslidehasanobviousamplificationeffectundertheactionoftheseismicwaves.Comparedwiththesteadyrockslopeadia.$收稿日期:2009—11-10;收到修改稿日期:2010-03-08.第一作者简介:夏敏,研究方向为岩土体稳定性及工程效应.Email:
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