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《软硬岩互层边坡崩塌机理及治理对策研究.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—9665/2009/17(2)-0200-06软硬岩互层边坡崩塌机理及治理对策研究胡斌黄润秋(成都理工大学地质灾害防治与环境保护国家重点实验室成都610059)摘要崩塌是红层地区软硬互层型边坡的主要工程地质问题之一。本文以西南地区某公路边坡为例,在边坡地质结构特征调查的基础上,分析了砂泥岩互层边坡崩塌形成机理,采用二维有限元方法研究了崩塌后上部凹腔岩体的变形破坏模式,并采用基于强度理论的稳定性评价方法研究了其稳定性。结果表明,崩塌的形成主要是由于差异风化在下部软岩部位形成凹腔,导致上部硬岩产生拉裂并逐
2、渐贯通;若不及时治理,上部岩体中结构面贯通至60%时,可能产生坠落失稳。综合分析边坡稳定性状况及变形破坏演化模式,采用“清坡+局部削坡+挂网喷混凝土+钢筋混凝土支撑柱+排水”的治理方案,重点控制凹腔以上岩体中拉裂的发展并做好防、排水工作。关键词崩塌形成机理稳定性评价治理对策支撑柱中图分类号:TD824.7文献标识码:ACoLLAPSEM[ECINISMANDTREATMENTMEASURESoFSLoPESWITHINTERBEDDINGSoFSoFTANDHARDRoCKSHUBinHUANGRunqiu(State研LaboratoryofGeoHazardPreventi
3、onandGeoEnvironmentProtection,ChengduUniversityofTechnology,Chengdu610059)AbstractSlopecollapseistheprimaryproblemofgeologicalprojectsinslopeswithinterbeddingsofsoftandhardrocksinredbedrockarea.ThispaperexaminesahighwayslopeinsouthwestareaofChina.Thecollapsemecha—nismofformationandthecharact
4、eristicsofstructurearestudiedusingfieldinvestigation.Theslopecharacteristicsoffailureanddeformationaftercollapsearestudiedwiththenonlinearfiniteelementmethodoftwodimensions.The.slopestabilityisalsoevaluatedwithquantitativemethod.Theresultshowsthatowingtothediscrepantweathering,thelowersoftro
5、ckmasshassomenotchthatcancausethecollapseandthecracksintheupperhardrockmass.Thecrackslinkupgradually.Ifitisnotstabilizedintime,theupperhardrockmasscancollapsewhenthecracksinthehardrockmasslinkupto60%inthickness.Basedonthecomprehensiveanalysisofthepresentslopestabil—ityandthepotentialpatterno
6、ffailureanddeformation,theschemeissettled.Itincludescleaningslopesurface,cuttingpartsoftheslope,hangingthenetofreinforcingbarandsprayedconcrete,reinforcedconcretesupportcol—umn,anddrainagesystem.Thefocaltreatmentmeasureistocontrolthedevelopmentofthecracksintheupperrockmassabovethenotchandtom
7、akewaterproofanddrainestablishment.KeywordsSlopeengineering,Collapse,Mechanism,Stabilityevaluation,Treatmentmeasures,Redbedrock收稿日期:2009—01—22;收到修改稿日期:2009—02—19.第一作者简介:胡斌,工程地质专业.Email:wuwen055@126.tom17(2)胡斌等:软硬岩互层边坡崩塌机理及治理对策研究2015951引言590软硬岩互层边坡中
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