Model Tests on Bearing Characteristics of High-strength Steel Tube Grid and Lattice Girder in Tunnel

被引：0

作者：

Song Y. ^{[1
]}

Huang M. ^{[1
]}

Zhang X. ^{[2
]}

Zhang Z. ^{[1
]}

机构：

[1] Key Lab. for Urban Underground Eng., The Education Ministry, Beijing Jiaotong Univ., Beijing

[2] China Railway 11th Bureau Group Co., Ltd., Wuhan

来源：

Gongcheng Kexue Yu Jishu/Advanced Engineering Sciences | 2022年 / 54卷 / 04期

关键词：

bearing characteristic; failure mode; high-strength steel tube grid; lattice girder;

D O I：

10.15961/j.jsuese.202100556

中图分类号：

学科分类号：

摘要：

Strengthening the primary support to quickly intervene in the stress state of surrounding rock was one of the effective ways to ensure the safety and stability of the tunnel during construction and operation periods. Following the concept of “timely support and strong support”, the mechanism of high-strength seamless steel tube replacing threaded reinforcement to enhance the bearing capacity of initial support structure was studied. The laboratory loading tests of steel tube grids and lattice girders under the conditions of single load and common load with concrete were carried out. The failure forms, deformation characteristics, ultimate bearing capacity, complete stress process, and crack development laws of the above structures were systematically analyzed. The results showed that steel consumption of the two supporting structures was basically the same, the maximum allowable deformation and ultimate bearing capacity of the steel tube grid were 1.6 times and 1.8 times than that of the lattice girder, respectively, which verified that the high-strength steel tubes could effectively improve the bearing performance of this structure. The lattice girder exhibited broken-line bending failure, but the steel tube grid represented smooth curve failure, and the rebound deformation was greater after unloading. The flexural rigidity of the steel tube grid concrete member was essentially the same as that of the lattice girder member, and the ultimate bearing capacity was 22.5% higher than that of the lattice girder concrete member. The bearing capacity of the lattice girder itself was limited, and it had a higher bearing capacity after forming a composite structure with concrete. The steel tube grid had the characteristics of high strength and high toughness, and the structural force was reasonable. Additionally, it could provide radial support to the surrounding rock in a timely and effective manner, and it was more suitable for weak and broken surrounding rock conditions with rapid early deformation. © 2022 Editorial Department of Journal of Sichuan University. All rights reserved.

引用

页码：99 / 111

页数：12

共 29 条

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