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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

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Front. Struct. Civ. Eng.    2017, Vol. 11 Issue (3) : 360-367    https://doi.org/10.1007/s11709-017-0429-3
RESEARCH ARTICLE
Investigation of mechanical performance of prestressed steel arch in tunnel
Yaqiong WANG1(), Yunxiao XIN1, Yongli XIE1, Jie LI2, Zhifeng WANG1
1. School of Highway, Shaanxi Provincial Major Laboratory for Highway Bridge & Tunnel, Chang’an University, Xi’an 710064, China
2. Shaanxi Communication Technology Consulting Co., Ltd., Xi’an 710068, China
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Abstract

In the traditional tunneling method, the steel arch are often adopted to support surrounding rock to ensure the structural stability. If the steel arch is prestressed in time, tunnel support can effectively prevent the development of rock crack, thereby increasing the overall strength of tunnel support and suppress the deformation of the surrounding rock. Based on the mechanical model of steel arch established in this paper, the stress distribution of steel arch is investigated via the numerical simulation method, and the impact on surrounding rock is also analyzed. Through a field test, the rules of the arch strain distribution are observed and discussed. The results show that the prestressed steel arch structure can provide effective support and the stress gradually decreases from stress point to another arch springing. Furthermore, the stress distribution applied by the prestressed steel arch on the surrounding rock is uniform in a certain extent, and it is suggested that this construction method utilizing the prestressed steel arch to squeeze surrounding rock is feasible from a theoretical view.
Keywords tunnel support      prestressing force      steel arch      numerical analysis     
Corresponding Author(s): Yaqiong WANG   
Online First Date: 09 August 2017    Issue Date: 24 August 2017
 Cite this article:   
Yaqiong WANG,Yunxiao XIN,Yongli XIE, et al. Investigation of mechanical performance of prestressed steel arch in tunnel[J]. Front. Struct. Civ. Eng., 2017, 11(3): 360-367.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-017-0429-3
https://academic.hep.com.cn/fsce/EN/Y2017/V11/I3/360
Fig.1  Steel arch used in tunnel engineering
Fig.2  Illustration of the procedure for assembling prestressed steel arch
Fig.3  Calculating diagram for circular beam on elastic foundation of steel
Fig.4  Finite element mesh used in the calculation
Model Element type Modulus E(GPa) Poisson ratio Density ρ(kg/m3)
Steel arch I20b 206 0.3 7850
Surrounding rock Grade IV 10 0.35 2000
Tab.1  Material parameters used in numerical model
L (m) σ(MPa) L (m) σ(MPa) L (m) σ(MPa) L (m) σ(MPa) L (m) σ(MPa)
0.0 250.1 3.9 284.0 7.9 258.4 11.8 235.2 15.8 213.9
0.2 372.0 4.2 282.5 8.1 257.1 12.1 233.9 16.0 212.8
0.4 336.1 4.4 281.0 8.3 255.8 12.3 232.7 16.2 211.7
0.7 343.3 4.6 279.5 8.6 254.5 12.5 231.5 16.4 210.6
0.9 317.1 4.8 278.1 8.8 253.1 12.7 230.2 16.7 209.5
1.1 311.4 5.0 276.6 9.0 251.8 12.9 229.0 16.9 208.4
1.3 304.4 5.3 275.2 9.2 250.5 13.2 227.8 17.1 207.3
1.5 302.0 5.5 273.7 9.4 249.2 13.4 226.7 17.3 206.3
1.8 299.5 5.7 272.3 9.6 247.9 13.6 225.4 17.5 205.3
2.0 297.9 5.9 270.8 9.9 246.6 13.8 224.2 17.8 204.7
2.2 296.2 6.1 269.4 10.1 245.3 14.0 223.1 18.0 204.9
2.4 294.7 6.4 268.1 10.3 244.0 14.3 221.9 18.2 207.5
2.6 293.1 6.6 266.7 10.5 242.7 14.5 220.8 18.4 214.1
2.8 291.6 6.8 265.3 10.7 241.4 14.7 219.6 18.6 225.3
3.1 290.0 7.0 263.9 11.0 240.2 14.9 218.4 18.9 230.0
3.3 288.5 7.2 262.5 11.2 238.9 15.1 217.3 19.1 221.0
3.5 287.0 7.5 261.2 11.4 237.7 15.3 216.2 19.3 182.0
3.7 285.5 7.7 259.8 11.6 236.4 15.6 215.0 19.5 158.1
Tab.2  Calculated stress of the steel arch after applying prestressing force
Fig.5  Stress distribution of the inner side of steel arch. (a) Before
Fig.6  Stress distribution cloud chart of surrounding rock
Fig.7  Strain gauges installed in field
Number 1# 2# 3# 4# 5# 6#
Horizontal Angle 15 ° 45 ° 75 ° 105 ° 135 ° 165 °
Position foot lumbar vault vault lumbar foot
Tab.3  Arrangement of Strain Cells on Arch.
Fig.8  Strain variation chart of the steel arc support
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