西南交通大学学报2024，Vol.59Issue(5)：1086-1094,9.DOI:10.3969/j.issn.0258-2724.20220197
马蹄形预制及喷锚初期支护结构试验对比研究
Experimental Comparison of Horseshoe Prefabricated and Spray Anchor Initial Support Structures
摘要
Abstract
In order to study the mechanical deformation characteristics of the new horseshoe prefabricated initial support structure and compare its difference with the spray anchor initial support structure,the prototype loading tests of two types of structures were carried out.The structural design,lining prefabrication,test loading,and result analysis were introduced systematically,and the test results were deeply analyzed.The results show that the ultimate bearing capacity of the prefabricated initial support structure is 2.80 times the design load,and that of the spray anchor initial support structure is 1.32 times the design load.The ultimate bearing capacity of the former is about 2.10 times that of the latter.The prefabricated initial support structure is affected by the positive bending moment and negative axial force at the vault and the arch waist,as well as the negative bending moment and positive axial force at the arch shoulder and the arch bottom.The spray anchor initial support structure is similar.The maximum moment and the maximum axial force of the prefabricated initial support structure are about 1.39 and 1.45 times that of the spray anchor initial support structure near the destruction phase,respectively.The concave and convex deformation trend of the prefabricated initial support structure is basically the same as that of the spray anchor initial support structure.The right arch shoulder is convex,and the right arch waist is concave,with steel and concrete spalling when the structure is damaged,and the ultimate deformation capacity of the prefabricated initial support structure is about 1.20 times that of the spray anchor initial support structure.关键词
马蹄形/预制初期支护/喷锚初期支护/承载能力/变形能力Key words
horseshoe/prefabricated initial support/spray anchor initial support/bearing capacity/deformation capacity分类
交通运输引用本文复制引用
白中坤,毕程程,赵修旺,薛永涛..马蹄形预制及喷锚初期支护结构试验对比研究[J].西南交通大学学报,2024,59(5):1086-1094,9.基金项目
云南省重点科技专项计划(202002AF080003-4) （202002AF080003-4）
