复杂地层条件下深基坑施工对下卧地铁隧道结构影响分析-(5744)

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1、AbstractInrecentyears,thepositionofthesubwayismoreandmoreimperativenow.Butthespaceunderthegroundbecomesmuchcomplexbecausethesubwaytunnelsthroughthespaceunderthecity,itmakesthestructureoftheundergroundspaceisparticularlycomplex.Itwouldbeabigproblemfortheexcavation,iftheworkerwasc

2、arelessslightly;theseriousengineeringaccidentwouldbehappen.Inordertoavoidsuchthingshappen,Itisnecessarytoknowtheinfluence-mechanismforsubwayofthedeepfoundationpitwhichabovethesubwaystructureincomplexgeologicalconditionsofthesoil.ThispaperisbasedontherealengineeringofDongHuansqua

3、rebetweentheeastofChanHestationandChangLePostation,boththetwostationbelongtotheline1subway.Thispapermainlystudythechangeruleofthedisplacementandmechanicalpropertiesoftunnelstructureunderthedeepfoundationpitexcavationandloadingatthetopofthepilewhichunderthefoundation.Thispapersum

4、marythefollowingconclusionsthroughthegeotechnicalcentrifugetestandthenumericalsimulation.1.Intheprocessofexcavation,thestressandthedisplacementaswellasthepressureofthetunnelstructureisaffectedobviously.Thestressandpressureareshowingadecreasingtrendaroundthetunnel,andthemostsigni

5、ficantchangeatthetopoftunnel.ThetunneldisplacementquantityoftheYdirectionisgreaterthantheXdirectiondisplacementchanges,thatistosaythewholetunnelshowsthetrendtobe‗elongated‘.2.Asthepilefoundationloadisincreasingunderthefoundationpitbottom,thestressandpressureaswellasthedisplaceme

6、ntofthetunnelstructureisnotverychangehugely.Thepressureandstressvariationatthebottomofthetunnelisgreaterthanthetopofthetunnel,andthestressandpressurevariationonbothsidesofthetunnelroughlythesame.Themaximizeverticaldisplacementchangeofthetunnelisthetopofthetunnel,andthemaximizeho

7、rizontaldisplacementchangeofthetunnelisinthelateraltunnel.3.Intheprocessofpilefoundationloading,thepressure,stressandhorizontaldisplacementoftheinsideofthedouble-linetunnelcross-sectionwhichisclosetothepilechangesinvaluesrelativetotheothercross-sectiontunnel.Andthestressoftheend

8、oftheIItunnelisfarawayfromthestressofthecentral