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第41卷第4期西北农林科技大学学报(自然科学版)Vol.41No.4 2013年4月JournalofNorthwestA&FUniversity(Nat.Sci.Ed.)Apr.2013 网络出版时间:2013-03-2715:50 网络出版地址:http://www.cnki.net/kcms/detail/61.1390.S.20130327.1550.024.html 深基坑开挖对邻近通道影响的实测及数值分析 姜兆华a,b,张永兴a,b (重庆大学a土木工程学院,b山地城镇建设与新技术教育部重点实验室,重庆400030) [摘要]【目的】研究基坑开挖对邻近通道的影响,为邻近通道基坑开挖工程的设计与施工提供参考。【方 法】以重庆某周围存在邻近人防洞通道的岩质深基坑工程为例,通过数值模拟和现场观测,研究土岩组合地层基坑与 通道变形、通道拱脚推力及围岩破坏模式的关系。【结果】邻近通道会改变地表最大沉降点位置,土岩组合地层中地 表沉降主要与基坑的水平位移和通道沉降有关。通道与基坑之间围岩间壁厚度较大时,隧洞破坏来自于拱顶;间壁 厚度较小时,隧洞破坏来自于侧壁。由于受连续介质及隧道几何形态的影响,围岩会改变位移场传递的方向,通道主 要表现为横向变形。【结论】邻近通道会增加基坑的水平位移与沉降,通道的破坏方式与间壁岩体厚度有关。 [关键词]邻近通道;深基坑;数值模拟;拉裂破坏;变形监测 [中图分类号]TU433[文献标志码]A[文章编号]1671-9387(2013)04-0220-07 Fieldmeasurementandnumericalanalysisoneffectsof deepexcavationonadjacentchannel JIANGZhao-huaa,b,ZHANGYong-xinga,b (aCollegeofCivilEngineering,bKeyLaboratoryofNewTechnologyforConstructionofChinain MountainousArea,ChongqingUniversity,Chongqing400030,China) Abstract:【Objective】Thisstudyfocusedontheeffectsofexcavationfoundationpitonadjacentchan- nelsandaimedtoimprovethedesignandconstructionofthefoundationpit.【Method】Basedontherock deepexcavationadjacenttothechannelinChongqing,thedeformationofthechannelanddeepfoundation pit,thrustatspringer,andthesurroundingrockfailuremodewerestudiedbynumericalsimulationand fieldmeasurementinthesoilrocklayer.【Result】Theresultsshowedthattheadjacentchannelchangedthe positionofthebiggestsettlementpoint,andthegroundsurfacesettlementwasrelatedtothehorizontaldis- placementandthesettlementofthechannelinsoilrocklayer.Whenthethicknessofthesurroundingrock waslarger,thetunnelvaultmayappeartensionfailure.Ifthethicknessofthesurroundingrockwassmal- ler,thelateralwallmayappeartensionfailure.Duetotheinfluenceofthecontinuousmediaandtunnelgeo- metricshape,thesurroundingrockwouldchangethedirectionofdisplacementfieldandcausethelateral deformation.【Conclusion】Adjacentchannelwillincreasethehorizontaldisplacementandsettlementofthe foundationpit,andthefailuremodeisrelatedtothethicknessoftherockmass. Keywords:adjac