合肥典型地层双线盾构近接下穿对高铁桥群桩的影响
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摘要
为了了解合肥典型地层双线盾构近接下穿对高铁桥群桩的影响,以合肥地铁3号线盾构隧道施工近距离穿越高铁桥桩基群工程为例,利用有限元分析软件对盾构施工的全过程进行三维动态模拟,通过分析盾构施工过程中桩身横向位移、弯矩、轴力分布等变化规律,研究了双线盾构近接下穿对高铁桥群桩的扰动规律。结果表明:盾构隧道施工在穿越桩基础群时,距离盾构掌子面较近的桩受到的影响明显大于较远位置的桩;当盾构掌子面推进到与桩群相交处时产生的施工扰动最大;桩基础在盾构中心线上下一倍洞径深度范围内所受到的盾构施工扰动影响最大,桩身轴力和弯矩明显大于其他部位;且双线盾构隧道的后施工隧道的开挖使得先施工隧道周围桩基受到的扰动幅度得以降低。
In order to realize the influence of the typical adjacent constructions of double-line shield of formation in Hefei on the piles of high-speed railway bridges, using the finite element analysis software to carry out three-dimensional dynamic simulation in the course of shield construction on the basis of the construction of line 3 shield tunnel in Hefei Metro running through a high-speed bridge pile foundation group, the disturbance law is studied by the analysis of the distribution law of the lateral displacement, bending moment and axial force of the pile during the construction process of the shield. The results show that when the shield tunnel is built through the pile foundation group, the influence of the pile closer to the shield face is obviously greater than that of the far position pile, and the construction disturbance caused by the shield face pushing to the intersection with the pile group is the largest, and the shield construction disturbance will bear the greatest impact when the pile foundation is subjected to the depth of the next hole diameter on the shield center line, the axial force and bending moment of the pile body are obviously larger than those of the other parts, also the excavation of the post-construction tunnel of the double-line shield tunnel reduces the disturbance amplitude of the pile foundation around the first construction tunnel.
In order to realize the influence of the typical adjacent constructions of double-line shield of formation in Hefei on the piles of high-speed railway bridges, using the finite element analysis software to carry out three-dimensional dynamic simulation in the course of shield construction on the basis of the construction of line 3 shield tunnel in Hefei Metro running through a high-speed bridge pile foundation group, the disturbance law is studied by the analysis of the distribution law of the lateral displacement, bending moment and axial force of the pile during the construction process of the shield. The results show that when the shield tunnel is built through the pile foundation group, the influence of the pile closer to the shield face is obviously greater than that of the far position pile, and the construction disturbance caused by the shield face pushing to the intersection with the pile group is the largest, and the shield construction disturbance will bear the greatest impact when the pile foundation is subjected to the depth of the next hole diameter on the shield center line, the axial force and bending moment of the pile body are obviously larger than those of the other parts, also the excavation of the post-construction tunnel of the double-line shield tunnel reduces the disturbance amplitude of the pile foundation around the first construction tunnel.
引文
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[2]贾玉生.盾构施工近接桩基的影响研究[D].合肥:安徽建筑大学,2015.
[3]丁松波,罗杰峰,傅鹃.盾构隧道近距离穿越群桩基础的影响分析[J].公路与汽运,2014(6):181–186.
[4]潘军刚.隧道近接施工引起邻近既有桩基的内力和变形研究[D].山东科技大学,2007.
[5]夏元友,张亮亮,王克金.地铁盾构穿越建筑物施工位移的数值分析[J].岩土力学,2008,29(5):1 411–1 414.
[6]苗峰,唐德金.地铁旁穿桥梁桩基础数值模拟[J].大连大学学报,2014(6):41–44.
[7]Loganathan N,Poulos H G,Stewart D P.Centrifuge model testing of tunnelling-induced ground and pile deformations[J].Géotechnique,2000,50(3):283–294.
[8]朱逢斌,杨平.盾构隧道开挖对邻近桩基影响数值分析[J].岩土工程学报,2008,30(2):298–302.
[9]仇文革.地下工程近接施工力学原理与对策的研究[D].成都:西南交通大学,2003.
[10]杨晓杰,邓飞皇,聂雯,等.地铁隧道近距穿越施工对桩基承载力的影响研究[J].岩石力学与工程学报,2006,25(6):1 290–1 295.
[11]袁海平,王斌,朱大勇,等.盾构近距侧穿高架桥桩的施工力学行为研究[J].岩石力学与工程学报,2014,33(7):1457–1 464.
[12]李松,杨小平,刘庭金.广州地铁盾构下穿对近接高架桥桩基的影响分析[J].铁道建筑,2012(7):74–78.
[13]王立新.盾构超近距离穿越大型立交桩基群影响研究[J].地下空间与工程学报,2016,12(3):761–768.
[14]李进军,王卫东,黄茂松,等.地铁盾构隧道穿越对建筑物桩基础的影响分析[J].岩土工程学报,2010,32(z2):166–170.
[15]杨敏,赵锡宏.分层土中的单桩分析法[J].同济大学学报:自然科学版,1992,20(4):421–428.
[16]李早,黄茂松.隧道开挖对群桩竖向位移和内力影响分析[J].岩土工程学报,2007,29(3):398–402.