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ID:5360590
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时间:2017-12-08
《高速公路路堑边坡顺层滑坡分析与治理》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、第24卷第23期岩石力学与工程学报Vol.24No.232005年12月ChineseJournalofRockMechanicsandEngineeringDec.,2005高速公路路堑边坡顺层滑坡分析与治理杨明亮,袁从华,骆行文,姚海林(中国科学院武汉岩土力学研究所,湖北武汉430071)摘要:潭邵高速公路K90+900~K91+080段路堑边坡中有2条次一级断层与公路斜交,山体上部的岩体中存在大量的相互切割的近似垂直的节理,山体内存在顺坡向的劣质煤层和泥岩层,构成了山体滑坡的内因。该段路堑开挖深度最大约30m,边坡开挖后,地表水沿节理裂隙入渗到软弱岩层,使软岩的抗
2、剪强度下降,诱发了该路堑边坡滑动。滑坡计算采用简化Bishop法,通过反分析计算与工程经验类比法,确定滑动带的抗剪强度指标为ϕ=11.5°,c=8.2kPa。经计算分析,如果仅采用抗滑桩或锚杆进行加固,其工程量大、成本高,因此提出以削坡减载为主的初步治理方案。由于在施工过程中坡顶的裂缝未及时封堵,坡面未形成有效的排水系统,以及滑动带的水不能及时有效排出,导致滑动带的抗剪强度指标进一步下滑,使削坡减载治理措施未产生明显功效。经进一步的计算分析,提出在原削坡基础上,增加长锚杆与其他防护和防水补充治理措施,有效地阻止了滑坡的进一步下滑,使滑坡保持长期稳定状态。关键词:边坡工程
3、;高速公路;路堑边坡;顺层滑坡;分析与治理中图分类号:TD824.7文献标识码:A文章编号: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、eseamaredrawnoutthattheinternalfrictionangleϕ=11.5°andthecohesionc=8.2kPabybackanalysisandexperienceanalogy.Iftherockboltsoranti-slidepilesarejustadoptedwithoutcutting-slopeunloadinginthetreatment,thetreatmentwillbeveryexpensive.Therefore,themainmeasuresadoptedforcutting-slopeunloadingar
7、eputforwardinthefirstlandslidetreatmentscheme.Inconstruction,topcracksarenotblockedanddrainagesystemisnotsetupintime,theshearresistanceofslideseamconstantlyfallsbecausethewaterintheslideseamisnoteasilydrainedaway;andleadtheslopetoslideconstantly.Basedonfurthercalculationa
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