浅埋隧道开挖对超近距离高架桥桩基影响研究
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摘要
为了研究浅埋隧道开挖对既有超近距离桥梁桩基的影响,采用有限元法,结合典型工程实例,建模并分析隧道开挖对桩基受力变形特性的影响规律。结果表明:在隧道与近距离既有桩基之间设置搅拌桩,可有效降低隧道施工对桩基内力与位移的影响。顶管隧道开挖形成临空面以上覆土厚度小,自稳能力较差引起较大地层沉降,故桩基顶部侧向移动最大,而非在隧道埋深处。与实测值的对比表明文中提出的建模计算方法具备有效性。
In order to study the influence of pipe jacking tunnel to extremely close pile-foundation of the viaduct,combining with the typical engineering examples,using Finite Element to establish calculation model for calculating the influence on stress deformation characteristics of pile-foundation brought by tunnel excavation. The results indicate that setting mixing pile between the tunnel and close pile-foundation can effectively reduce the effects of internal force and displacement of pile-foundation. For pipe jacking tunnel,a volley over surface is formed when tunnel excavation and thickness of the soil is small,so stability is very poor. The subsidence caused by the poor stability is the maximal at the top of pile rather than at the depth that tunnel buried. Comparing calculated values with measured values indicate that the method for establishing calculation model is valid.
In order to study the influence of pipe jacking tunnel to extremely close pile-foundation of the viaduct,combining with the typical engineering examples,using Finite Element to establish calculation model for calculating the influence on stress deformation characteristics of pile-foundation brought by tunnel excavation. The results indicate that setting mixing pile between the tunnel and close pile-foundation can effectively reduce the effects of internal force and displacement of pile-foundation. For pipe jacking tunnel,a volley over surface is formed when tunnel excavation and thickness of the soil is small,so stability is very poor. The subsidence caused by the poor stability is the maximal at the top of pile rather than at the depth that tunnel buried. Comparing calculated values with measured values indicate that the method for establishing calculation model is valid.
引文
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[2]MORTON J D,KING K H.Effects of tunneling on the bearing capacity and settlement of piled foundations[C].Proceeding of Tunneling79,London:IMM,1979
[3]LOGANATHAN N,POULOS H G,Stewart D P.Centrifuge model testing of tunneling-induced ground and pile deformations[J].Geotechnique,2000(3)
[4]朱逢斌,杨平,Ong C W.盾构隧道开挖对邻近桩基影响数值分析[J].岩土工程学报,2008(2)
[5]张云军,宰金珉,王旭东等.隧道开挖对临近桩基影响的二维数值分析[J].地下空间与工程学报,2005(6)
[6]刘枫,年廷凯,杨庆等.隧道开挖对邻近桩基工作性能的影响研究[J].岩土力学,2008(28)
[7]芮勇勤,岳中琦,唐春安等.隧道开挖方式对建筑物桩基影响的数值模拟分析[J].岩石力学与工程学报,2003(5)
[8]王占生,王梦恕.盾构施工对周围建筑物的安全影响及处理措施[J].中国安全科学学报,2002(2)
[9]陈健云,刘金云.地震作用下输水隧道的流固耦合分析[J].岩土力学,2006(7)
[10]陈俊生,莫海鸿.盾构隧道管片施工阶段力学行为的三维有限元分析[J].岩石力学与工程学报,2006(增2)
[11]张海波,殷宗泽,朱俊高等.盾构法隧道衬砌施工阶段受力特性的三维有限元模拟[J].岩土力学,2005(6)
[12]张云,殷宗泽,徐永福.盾构法隧道引起的地表变形分析[J].岩石力学与工程学报,2002(3)
[13]Goodman R E et al.A model for the mechanics of jointed rock.Proc ASCE of J SM&F Dn,1986(SM3)
[14]Itasca Consulting Group.FLAC2D(fast Lagrangian analysis of continua)user guide[M].Minneapolis:Itasca Consulting Group,2001
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