泸定大渡河特大桥隧道锚模型变形试验研究

发布时间：2018-07-08 19:00

本文选题：隧道锚 + 模型锚　；参考：《铁道工程学报》2017年01期

【摘要】：研究目的:以雅康高速公路泸定大渡河特大桥隧道锚碇为研究对象,为获取大桥隧道锚实桥锚的设计参数及判断成桥后锚塞体的变形情况,在实桥锚附近开展1∶10比例尺模型锚碇变形试验研究,包括监测表面变形、深部变形、锚碇与围岩接触面的位错变形、锚体应变等,分析隧道锚在1P、3.5P、7P荷载作用下的变形特性。研究结论:(1)在1P、3.5P、7P荷载下,锚碇体平均变形分别为0.40 mm、2.19 mm、5.81 mm;(2)围岩变形(拉力方向和铅直方向)分别为小于0.25 mm、0.21~1.86 mm、-0.42~6.59 mm;(3)锚体与围岩之间错动最大值分别为0.12 mm、0.32 mm、0.77 mm;(4)锚体及围岩的受荷瞬时变形较明显,设计中应充分考虑隧道锚与围岩的错动变形和围岩的变形稳定性问题;(5)该项成果可为桥梁设计提供必要的技术参数与支撑,同时也可为同类工程提供技术参考。
[Abstract]:Research purpose: take the Anchorage of Luding Dadu River Bridge Tunnel of Yakang Expressway as the research object, to obtain the design parameters of the bridge tunnel Anchorage and to judge the deformation of the anchor plug after the completion of the bridge. A 1:10 scale model Anchorage deformation test was carried out near the real bridge anchor, including monitoring surface deformation, deep deformation, dislocation deformation of the interface between Anchorage and surrounding rock, Anchorage strain, and so on. The deformation characteristics of tunnel anchors under the loading of 1Pn3.5P7P were analyzed. The conclusions are as follows: (1) under the load of 1 Pu 3.5PU 7P, The average deformation of Anchorage is 0.40 mm / 2.19 mm / 5.81 mm respectively; (2) the deformation of surrounding rock (tensile direction and vertical direction) is less than 0.25 mm / 0.21 mm / 1.86 mm / -0.42 mm / 6.59 mm respectively; (3) the maximum value of dislocation between anchor body and surrounding rock is 0.12 mm / 0.32 mm 0.77 mm; (4) the instantaneous deformation of anchor body and surrounding rock is obvious. The staggered deformation of tunnel anchor and surrounding rock and the deformation stability of surrounding rock should be fully considered in the design. (5) this achievement can provide necessary technical parameters and support for bridge design and also provide technical reference for similar projects.
【作者单位】：西南交通大学;四川省交通运输厅公路规划勘察设计研究院;长江水利委员会长江科学院;
【分类号】：U448.25

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