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1、"JournalofEngineeringGeology工程地質(zhì)學(xué)報(bào)1004—9665/2009/17(2)-0200-06軟硬巖互層邊坡崩塌機(jī)理及治理對(duì)策研究胡斌黃潤秋(成都理工大學(xué)地質(zhì)災(zāi)害防治與環(huán)境保護(hù)國家重點(diǎn)實(shí)驗(yàn)室成都610059)摘要崩塌是紅層地區(qū)軟硬互層型邊坡的主要工程地質(zhì)問題之一。本文以西南地區(qū)某公路邊坡為例,在邊坡地質(zhì)結(jié)構(gòu)特征調(diào)查的基礎(chǔ)上,分析了砂泥巖互層邊坡崩塌形成機(jī)理,采用二維有限元方法研究了崩塌后上部凹腔巖體的變形破壞模式,并采用基于強(qiáng)度理論的穩(wěn)定性評(píng)價(jià)方法研究了其穩(wěn)定性。結(jié)果表明,崩塌的形成主要是由于差異風(fēng)化在下部軟巖部位形成凹腔,導(dǎo)致上部硬巖產(chǎn)生拉裂并逐
2、漸貫通;若不及時(shí)治理,上部巖體中結(jié)構(gòu)面貫通至60%時(shí),可能產(chǎn)生墜落失穩(wěn)。綜合分析邊坡穩(wěn)定性狀況及變形破壞演化模式,采用“清坡+局部削坡+掛網(wǎng)噴混凝土+鋼筋混凝土支撐柱+排水”的治理方案,重點(diǎn)控制凹腔以上巖體中拉裂的發(fā)展并做好防、排水工作。關(guān)鍵詞崩塌形成機(jī)理穩(wěn)定性評(píng)價(jià)治理對(duì)策支撐柱中圖分類號(hào):TD824.7文獻(xiàn)標(biāo)識(shí)碼: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.第一作者簡介:胡斌,工程地質(zhì)專業(yè).Email:wuwen055@126.tom17(2)胡斌等:軟硬巖互層邊坡崩塌機(jī)理及治理對(duì)策研究2015951引言590軟硬巖互層邊坡中