实验技术与管理2025，Vol.42Issue(4)：59-67,9.DOI:10.16791/j.cnki.sjg.2025.04.008
隧道矩形截面钢管格栅拱架支护构件抗弯性能全尺寸模型实验设计
Full-scale model test design of bending performance of rectangular steel pipe grid arch support components in tunnels
摘要
Abstract
[Objective]With the gradual development of tunnel engineering activities in southwestern China extending into deeper regions,issues of large deformation in soft rocks under high ground stress have become increasingly significant.This has resulted in a growing number of structural support failures and collapses.Traditional lattice girders exhibit poor adaptability in soft rock conditions and lack independent load-bearing capacity.Similarly,I-shaped and H-shaped steel arches often experience torsional instability along their weak axis,with limited coupling effectiveness when combined with shotcrete.Therefore,there is a pressing need to develop a high-performance arch support structure.[Methods]This study designs a new type of rectangular steel pipe grid(RSPG)arch support structure that combines the strengths of lattice girder arch and section steel arch designs.The study utilizes a full-scale tunnel support structure bidirectional loading test system and proposes a numerical modeling method for RSPG arch components based on finite element analysis.Using these experimental methods,the research evaluates how axial force affects the compressive and bending bearing performance of RSPG components,uncovering their failure mechanisms and behavioral characteristics.This study provides valuable insights into the mechanical properties of the RSPG arch structure.[Results]1)The new RSPG arch structure features high-strength seamless steel pipes as primary load-bearing members,complemented by Π-shaped and U-shaped connecting web bars and round steel stirrups surrounding the steel pipes.This structural form improves the ultimate bearing capacity,overall stiffness,and structural stability.2)Deformation and plastic zones in RSPG arch components exhibit symmetrical patterns on either side.The main limb steel pipes and Π-shaped bars demonstrate obvious tensile and compressive distribution characteristics.Owing to stress concentration at loading points,plastic zones form in both upper and lower main limb steel pipes,with the lower pipes exhibiting a broader plastic zone.The Π-shaped bars experience high train levels and are prone to yielding and brittle failure.Despite this,RSPG arch components exhibit excellent toughness after unloading.3)During the entire loading process,RSPG arch components transition through elastic,yield,and stability stages,maintaining high bearing capacity even in the later stages of loading.Under axial force,the stable bearing capacity and bending stiffness of the RSPG arch improve considerably.For pure bending loading conditions,the ultimate bearing capacity of component GJ-S1 reaches approximately 94.5 kN·m,with a gradual strain progression at its measuring points.Under axial bending combined loading,component GJ-Z1 component demonstrates an enhanced ultimate bearing capacity of about 105.7 kN·m,with more pronounced strain developments,especially at later stages of loading.[Conclusions]This experiment provides an innovative experimental platform for students to optimize the designs and parameters of RSPG arch structures.It also presents innovative concepts for conducting experimental models to analyze the mechanical behavior of grid-like arch structures.关键词
隧道支护/矩形截面钢管格栅/抗弯性能/全尺寸试验/有限元分析Key words
tunnel support/rectangular steel pipe grid/bending performance/full-scale test/finite element analysis分类
交通工程引用本文复制引用
宋远,冯守中,荣传新,蔡海兵,安刚建,李亚峰,刘昊伟,曹艳..隧道矩形截面钢管格栅拱架支护构件抗弯性能全尺寸模型实验设计[J].实验技术与管理,2025,42(4):59-67,9.基金项目
安徽省高等学校自然科学研究项目(2023AH051202) （2023AH051202）
安徽省新建专业质量提升项目(2022xjzlts007) （2022xjzlts007）
云南省重点研发计划项目(202303AA080014) （202303AA080014）
国家级大学生创新创业训练计划项目(202310361109) （202310361109）
安徽省大学生创新创业训练计划项目(S202410361238) （S202410361238）
安徽理工大学校级教育教学改革研究项目(2023xjjy09) （2023xjjy09）
安徽省住房城乡建设科学技术计划项目(2023-YF033) （2023-YF033）
