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1、2010年1月铁道工程学报Jan2010第1期(总136)JOURNALOFRAILWAYENGINEERINGSOCIETYNO.1(Ser.136)文章编号:1006-2106(2010)01-0042-05浅埋暗挖小净距隧道应力集中现象分析XXX杨会军刘虹阳(中铁隧道集团有限公司,洛阳471009)摘要:研究目的:小净距隧道暗挖施工中,由于邻近导洞之间土柱应力集中,影响其安全状态和邻近后行隧道的施工,并影响到先行隧道的安全,严重的还可能造成周边建筑物、地中管线等设施的破坏。因此,对浅埋暗挖小净距隧道应力集中现象进行分
2、析,对保证施工安全十分重要。研究结论:本文结合宣武门车站小净距群洞暗挖施工,通过实测数据分析应力集中现象,量化了群洞施工时中间土柱的应力应变效应,分析了土柱沉降规律、土压力变化特征,监测结果显示:(1)相邻导洞中土柱体中间部位沉降值最大,达到-14.8mm,是其他区域的1.1～2倍,土柱体的沉降与土压力的关系和理论分析吻合,表明该部位产生明显的应力集中;(2)后行隧道对先行隧道产生微小的拉力作用。同时,按照开挖面与监测点的距离,对土柱沉降规律和土压力变化规律进行阶段划分,为采取措施降低应力集中现象提供依据。关键词:小净距隧
3、道;中间土柱沉降;应力集中中图分类号:U45文献标识码:AAnalysisofStressConcentrationofaLittleSpacingShallowandSubsurfaceExcavatedTunnelYANGHui-jun,LIUHong-yang(ChinaRailwayTunnelGroupCo.Ltd,Luoyang,Henan471009,China)Abstract:Researchpurposes:Inthecourseofsubsurfaceexcavationofalittlespacin
4、gtunnel,thestressconcentrationofthesoilmassbetweenadjacentpilottunnelsinfluencesthesafetyofthesoilmassbetweentwotunnels,theconstructionofthesubsequenttunnelandtheprevioustunnel,evendamagesthesurroundingbuildingsandundergroundpipeline.Therefore,analysisofthestressc
5、oncentrationofalittlespacingshallowandsubsurfaceexcavatedtunnelisveryimportanttoensuretheconstructionsecurity.Researchconclusions:Inthepaper,combinedwiththesubsurfaceexcavationofalittlespacinggrouptunnelsatXuanwumenStation,thestressconcentrationisanalyzedonthebasi
6、sofmonitoredandmeasureddata,thestressstraineffectsofthesoilmassbetweentwotunnelsduringtheconstructionofalittlespacingtunnelisquantified,andthesettlementregulationofthesoilmassandthechangecharacteristicsofsoilpressurearealsoanalyzed.Theresultsshow(1)Thesettlementat
7、thecenterofsoilmassbetweentwotunnelsisupto-14.8mm,being1.1～2timesofotherareas.Therelationbetweensoilsettlementandsoilpressureisidenticalwiththetheoreticalanalysis.Thisshowstheobviousstressconcentrationhappensatthisplace.(2)Thesubsequenttunnelslightlyaffectstheprev
8、ioustunnelintension.Atthesametime,accordingtothedistancebetweenworkingfaceandmonitoringsite,thestagesofearthsettlementandearthpressurearedividedtoprovid
