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1、第24卷第23期巖石力學(xué)與工程學(xué)報Vol.24No.232005年12月ChineseJournalofRockMechanicsandEngineeringDec.,2005高速公路路塹邊坡順層滑坡分析與治理?xiàng)蠲髁?,袁從華,駱行文,姚海林(中國科學(xué)院武漢巖土力學(xué)研究所,湖北武漢430071)摘要:潭邵高速公路K90+900~K91+080段路塹邊坡中有2條次一級斷層與公路斜交,山體上部的巖體中存在大量的相互切割的近似垂直的節(jié)理,山體內(nèi)存在順坡向的劣質(zhì)煤層和泥巖層,構(gòu)成了山體滑坡的內(nèi)因。該段路塹開挖深度最大約30m,邊坡開挖后,地表水沿節(jié)理裂隙入滲到軟弱巖層,使軟巖的抗
2、剪強(qiáng)度下降,誘發(fā)了該路塹邊坡滑動?;掠?jì)算采用簡化Bishop法,通過反分析計(jì)算與工程經(jīng)驗(yàn)類比法,確定滑動帶的抗剪強(qiáng)度指標(biāo)為?=11.5°,c=8.2kPa。經(jīng)計(jì)算分析,如果僅采用抗滑樁或錨桿進(jìn)行加固,其工程量大、成本高,因此提出以削坡減載為主的初步治理方案。由于在施工過程中坡頂?shù)牧芽p未及時封堵,坡面未形成有效的排水系統(tǒng),以及滑動帶的水不能及時有效排出,導(dǎo)致滑動帶的抗剪強(qiáng)度指標(biāo)進(jìn)一步下滑,使削坡減載治理措施未產(chǎn)生明顯功效。經(jīng)進(jìn)一步的計(jì)算分析,提出在原削坡基礎(chǔ)上,增加長錨桿與其他防護(hù)和防水補(bǔ)充治理措施,有效地阻止了滑坡的進(jìn)一步下滑,使滑坡保持長期穩(wěn)定狀態(tài)。關(guān)鍵詞:邊坡工程
3、;高速公路;路塹邊坡;順層滑坡;分析與治理中圖分類號:TD824.7文獻(xiàn)標(biāo)識碼:A文章編號:1000–6915(2005)23–4383–07ANALYSISOFBEDDINGLANDSLIDEOFCUTTINGSLOPEINANEXPRESSWAYANDITSTREATMENTYANGMing-liang,YUANCong-hua,LUOXing-wen,YAOHai-lin(InstituteofRockandSoilMechanics,ChineseAcademyofSciences,Wuhan430071,China)Abstract:InsegmentofK9
4、0+900–K910+080atXiangtan—ShaoyangExpressway,therearetwosub-firstgradefaultswhichintersectobliquelywithroadbed.Aplentifulintersectantjointswhichareaboutvertical,along-slopeclayshale,andbadcoalseamsexistintherockmassintheuppermountain,whichareintrinsicfactorsthatinducelandslide.Themaximumd
5、epthofcuttingslopeisabout30m.Afterthecuttingslopeisexcavated,theshearresistanceofsoftrockseamfallsbecausethesurfacewaterinfiltratesthroughthetoprockjointsintoit,andtherefore,landslidestakeplaceprobably.SimplifiedBishopmethodisadoptedinlandslidecalculation.Theshearstrengthparametersofslid
6、eseamaredrawnoutthattheinternalfrictionangle?=11.5°andthecohesionc=8.2kPabybackanalysisandexperienceanalogy.Iftherockboltsoranti-slidepilesarejustadoptedwithoutcutting-slopeunloadinginthetreatment,thetreatmentwillbeveryexpensive.Therefore,themainmeasuresadoptedforcutting-slopeunloadingar
7、eputforwardinthefirstlandslidetreatmentscheme.Inconstruction,topcracksarenotblockedanddrainagesystemisnotsetupintime,theshearresistanceofslideseamconstantlyfallsbecausethewaterintheslideseamisnoteasilydrainedaway;andleadtheslopetoslideconstantly.Basedonfurthercalculationa