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时间:2019-05-24
《陡倾顺层岩质斜坡倾倒变形破坏特征研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第28卷增1岩石力学与工程学报Vol.28Supp.12009年5月ChineseJournalofRockMechanicsandEngineeringMay,2009陡倾顺层岩质斜坡倾倒变形破坏特征研究11122任光明,夏敏,李果,刘昌,张富荣(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,四川成都610059;2.中国水电顾问集团西北勘测设计研究院,陕西西安710065)摘要:顺层岩质斜坡是常见的斜坡结构类型之一,对该类斜坡的变形破坏特征以及形成机制研究已较深入,一般认为顺层岩质斜坡的变形破坏以滑移–拉裂、滑移–弯曲(或溃曲)模式为特征。通
2、过系统的文献收集及大量现场调查发现,陡倾顺层岩质斜坡还存在一种典型的变形破坏形式,即倾倒变形。结合具体的陡倾顺层岩质斜坡倾倒变形破坏的实例,详细分析、总结该类斜坡发育的地质环境条件及变形破坏特征,在此基础上结合典型斜坡分析陡倾顺层岩质斜坡倾倒变形是在河谷演化、成坡过程中,岩层在平行坡面的最大主应力作用下由坡脚开始从下至上作悬臂梁弯曲,最终导致岩层根部折断,形成倾倒体;当坡体内折断带的剪应力超过其抗剪强度时,坡体将发生滑动形成滑坡。关键词:边坡工程;陡倾顺层岩质斜坡;倾倒;滑坡;变形破坏;形成机制中图分类号:P642.22文献标识码:A文章编号:1000–69
3、15(2009)增1–3193–08STUDYONTOPPLINGDEFORMATIONANDFAILURECHARACTERISTICSOFSTEEPBEDDINGROCKSLOPE11122RENGuangming,XIAMin,LIGuo,LIUChang,ZHANGFurong(1.StateKeyLaboratoryofGeohazardPreventionandGeoenvironmentProtection,ChengduUniversityofTechnology,Chengdu,Sichuan610059,China;2.Northwest
4、Investigation,DesignandResearchInstitute,ChinaHydropowerEngineeringConsultingGroupCo.,Xi'an,Shaanxi710065,China)Abstract:Beddingrockslopeisoneofthecommonslopetypes.Theintensivestudieshavebeendoneforitsslopedeformation,failurecharacteristicsandformationmechanism.Generally,itisbeliev
5、edthatslip-ruptureandslip-bendingaremaincharacteristicsofdeformationandfailureofbeddingrockslope.Throughthecollectionofsystemicreferencesandgreatamountsoflocationinvestigation,itisfoundthatthereisanothertypicalformofdeformationandfailureforsteepbeddingrockslope,namely,topplingdefor
6、mation.Combiningthetypicalengineeringcasesofsteepbeddingrockslopeswithdeformationandfailurecharacteristics,thegeologicalconditionsandthedeformationandfailurecharacteristicsofthiskindslopearesummarizedandanalyzed.Basedonthesestudies,itisshownthatintheprocessofvalleyevolutionandslope
7、-formationandunderthemaximumprincipalstressatthefootofslope,whichisparalleltoslope,rockstratumbendsfromtoptobottomasacantileverbeam,finallyitsrootwillbebrokenoff,andatopplingbodycomesintobeing.Whenthemaximumshearstressisgreaterthantheshearstrengthinthesnappedzoneoftheslope,itwillsl
8、ipandlandslidehappens.Keyw
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