长江科学院院报2025，Vol.42Issue(2)：1-8,8.DOI:10.11988/ckyyb.20241166
软岩隧洞约束混凝土箱型钢拱架支护承载特性
Bearing Characteristics of Confined Concrete Box Steel Arch in Soft Rock Tunnel
摘要
Abstract
Confined concrete box steel arch is a composite arch structure comprising box steel and core concrete.It is a novel support form designed to effectively control deformation in soft rock tunnels.Currently,there is limited research on the bearing characteristics of this arch type.In view of this,a compression-bending yield criterion for confined concrete box section is deduced,and the ultimate bearing capacities for strength and structural stability are analyzed respectively.Furthermore,the bearing characteristics of three arch types:confined concrete box steel arch,H-type steel arch,and box steel arch,are compared.Results indicate that the yield criterion value for the confined concrete box steel arch section is the highest among the types considered.Specifically,its axial compres-sion yield limit is 1.4 times that of the box type and 2.2 times that of the H-type.Moreover,the pure bending yield limit is 1.1 times that of the box type and 1.5 times that of the H-type.The strength and ultimate bearing capacity of confined concrete box steel arch surpass those of the box type and H-type steel arches.The ultimate bearing capaci-ty for strength is 1.3-1.4 times that of the box steel arch and 2.2-2.3 times that of the H-type steel arch.The ulti-mate bearing capacity for structural stability is 1.03-1.04 times that of the box steel arch and 1.10-1.27 times that of the H-type steel arch.Consequently,the confined concrete box steel arch exhibits significant advantages in load-bearing characteristics and can provide reliable and efficient support in soft rock tunnels.关键词
软岩隧洞/约束混凝土箱型钢拱架/压弯屈服判据/强度极限承载力/结构稳定极限承载力Key words
soft rock tunnel/confined concrete box steel arch/compression-bending yield criterion/strength resist-ant capability/ultimate bearing capacity of structure stability分类
建筑与水利引用本文复制引用
黄书岭,王祥祥..软岩隧洞约束混凝土箱型钢拱架支护承载特性[J].长江科学院院报,2025,42(2):1-8,8.基金项目
国家自然科学基金重点项目(U2340229) （U2340229）
国家自然科学基金青年项目(52409124) （52409124）
中央级公益性科研院所基本科研业务费项目(CKSF2024329/YT) （CKSF2024329/YT）
