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Experimental Study on the Application of Heat-Treated High-Strength Lattice Girder in Tunnel Engineering

1
School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
2
College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
*
Author to whom correspondence should be addressed.
Symmetry 2019, 11(8), 1007; https://doi.org/10.3390/sym11081007
Received: 11 July 2019 / Revised: 29 July 2019 / Accepted: 1 August 2019 / Published: 5 August 2019
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Abstract

Heat-treated high-strength rebar has many advantages, such as high strength, superior ductility, high yield ratio, excellent welding and cold bending performance, which can effectively reduce the amount of rebar and improve the project quality. Although heat-treated high-strength rebar has been successfully applied in many fields of civil engineering, its application in tunnel engineering is just getting started. In this study, the on-site test of axisymmetric heat-treated high-strength lattice girders in rail tunnels and road tunnels was carried out. Comparative analysis of the performance of axisymmetric heat-treated high-strength lattice girders and original-design I20b steel rib was conducted. The test results show that the settlement of high-strength lattice girders is decreased by about 7%~30% compared with the test section of original-design I20b steel rib. The surrounding rock pressure is similar, but the stress of high-strength lattice girders is slightly higher than that of I20b steel rib. Due to the better binding ability of the lattice girders and the concrete, the ultimate bearing capacity of the ‘lattice girders and shotcrete’ is greater than that of the ‘I20b steel rib and shotcrete’. Moreover, the steel consumption of lattice girder is about 36% less than I20b steel rib, which shows significant economic and social benefits. View Full-Text
Keywords: tunnel engineering; lattice girder; section steel arch frame; axisymmetric high-strength lattice girders; field test tunnel engineering; lattice girder; section steel arch frame; axisymmetric high-strength lattice girders; field test
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Tan, Z.; Han, K. Experimental Study on the Application of Heat-Treated High-Strength Lattice Girder in Tunnel Engineering. Symmetry 2019, 11, 1007.

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