Study on Creep Test of In-situ Scaling Model of Suspension Bridge Tunnel Anchorage

WEN Lina; CHENG Qiangong; CHENG Qiang; GUO Xifeng

doi:10.3969/j.issn.0258-2724.20181013

Volume 55 Issue 1

Jan. 2020

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Journal of Southwest Jiaotong University > 2020 > 55(1): 202-209.

WEN Lina, CHENG Qiangong, CHENG Qiang, GUO Xifeng. Study on Creep Test of In-situ Scaling Model of Suspension Bridge Tunnel Anchorage[J]. Journal of Southwest Jiaotong University, 2020, 55(1): 202-209. doi: 10.3969/j.issn.0258-2724.20181013

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WEN Lina, CHENG Qiangong, CHENG Qiang, GUO Xifeng. Study on Creep Test of In-situ Scaling Model of Suspension Bridge Tunnel Anchorage[J]. Journal of Southwest Jiaotong University, 2020, 55(1): 202-209. doi: 10.3969/j.issn.0258-2724.20181013

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Study on Creep Test of In-situ Scaling Model of Suspension Bridge Tunnel Anchorage

doi: 10.3969/j.issn.0258-2724.20181013

WEN Lina^{1,2
,},
CHENG Qiangong^{1
,
,},
CHENG Qiang²,
GUO Xifeng³

Received Date: 17 Dec 2018
Rev Recd Date: 28 Apr 2019

Available Online: 13 May 2019

Publish Date: 01 Feb 2020

Abstract

Abstract

In order to obtain the creep deformation law of tunnel anchor of Luding Dadu River super-large suspension bridge on Yakang Expressway, creep test of 1∶10 in-situ scale model of tunnel anchor was carried out according to similarity theory. The graded loading test of model anchor was carried out with gas-liquid loading system, the creep process of model anchor, surrounding rock and interface dislocation under 1.00P (single design tension of scale model), 3.50P, and 7.00P loads were analyzed. The three-dimensional viscoelastic-plastic simulation analysis of creep of anchorage and surrounding rock mass was carried out by FLAC^3D, and the simulation value was compared with the measured value. The results show that under 1.00P, 3.50P, and 7.00P loads, the maximum creep of anchor body are 0.62, 0.97 mm, and 1.58 mm, the maximum creep of surrounding rock are 0.49, 0.85, and 1.38 mm, and the maximum creep of anchor body and surrounding rock are 0.15, 0.64 mm, and 1.43 mm, respectively. The measured creep deformation of anchorage and surrounding rock is equivalent to the calculated value, and the creep trend is basically the same. The tunnel anchor and surrounding rock of Yakang super-large suspension bridge belong to stable creep under various loads, the creep of anchorage does not affect the long-term stability of suspension bridge under normal design loads.
- tunnel anchorage,
- scaling model test,
- creep,
- long-time stability

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References

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