铁道科学与工程学报2025，Vol.22Issue(3)：1188-1201,14.DOI:10.19713/j.cnki.43-1423/u.T20240835
隧道支护组合结构大偏心受压性能试验研究
Experimental study on large eccentric compression performance of tunnel support composite structure
摘要
Abstract
To ensure better cooperative performance between the initial tunnel support steel arch and sprayed concrete,and considering the eccentric compressive loading characteristics of tunnel support structures,this article proposed the addition of different forms of shear studs on the steel arch to form a composite support structure.Large eccentric compression tests were conducted in the laboratory to analyze the bearing performance of the natural bond state and the composite structure with shear studs.The optimal arrangement of shear studs was explored.The theoretical calculation formula for the ultimate bearing capacity of the composite structure was derived.The results indicate that under large eccentric compression tests,the failure mode of the steel-concrete composite member in the natural bond state is similar to the actual tunnel support structure,where the concrete is prone to spalling.When shear studs are arranged on the web of the steel,the crack propagation range is reduced,significantly enhancing the cooperative bearing capacity of the composite structure.The staggered arrangement of shear studs is more effective than the double-row arrangement in suppressing component failure.The ductility,bearing performance,and bending stiffness of the members with shear studs are improved.Compared to the natural bond condition,the ultimate bearing capacity of the double-row and staggered shear stud arrangements can increase by 14.83%and 27.63%,respectively,while the lateral deflection values decreased by 24.27%and 30.21%.When loaded to 0.4 times of the ultimate load,the natural bond members can no longer meet the plane section assumption,while the double-row and plum-shaped members can still meet the plane section assumption when loaded to 0.8 times and 0.9 times of the ultimate load.Through experimental analysis,it is found that the staggered shear stud arrangement is more reasonable for improving the bearing performance of the composite structure.Based on the plane section assumption,a theoretical calculation formula for the ultimate bearing capacity of the large eccentric compression of the steel-concrete composite structure is proposed and validated.The research results can provide theoretical support for the initial tunnel support design.关键词
栓钉剪力件/型钢-混凝土组合结构/共同承载/平截面假定/偏心受压试验/极限承载力Key words
stud shear connector/steel-shotcrete composite structure/co-bearing/plane section assumption/eccentric compression test/ultimate bearing capacity分类
交通工程引用本文复制引用
王明胜,王奎,路军富,张宏鑫..隧道支护组合结构大偏心受压性能试验研究[J].铁道科学与工程学报,2025,22(3):1188-1201,14.基金项目
国家自然科学基金面上项目(51978088) （51978088）
SKLGP国家重点实验室自主课题(SKLGP2021Z007) （SKLGP2021Z007）
