[1]陈丽俊,张家瑞,陈建勋,等.软弱围岩隧道初期支护承载力计算方法与参数综合比选[J].长安大学学报(自然科学版),2025,45(4):68-80.[doi:10.19721/j.cnki.1671-8879.2025.04.006]
　CHEN Li-jun,ZHANG Jia-rui,CHEN Jian-xun,et al.Calculation method of bearing capacity and comprehensive comparison of parameters for initial support of weak rock tunnels[J].Journal of Chang’an University (Natural Science Edition),2025,45(4):68-80.[doi:10.19721/j.cnki.1671-8879.2025.04.006]
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软弱围岩隧道初期支护承载力计算方法与参数综合比选()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第45卷
期数:
2025年4期
页码:
68-80
栏目:
桥梁与隧道工程
出版日期:
2025-07-30

文章信息/Info

Title:
Calculation method of bearing capacity and comprehensive comparison of parameters for initial support of weak rock tunnels
文章编号:
1671-8879(2025)04-0068-13
作者:
陈丽俊1; 张家瑞1; 陈建勋1; 刘瑞辉2; 罗彦斌1; 王传武1
(1. 长安大学 公路学院,陕西 西安 710064; 2. 中交第一公路勘察设计研究院有限公司,陕西 西安 710075)
Author(s):
CHEN Li-jun1;  ZHANG Jia-rui1;  CHEN Jian-xun1;  LIU Rui-hui2; LUO Yan-bin1;  WANG Chuan-wu1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. China Communications Construction Company First Highway Consultants Co., Ltd., Xi'an 710075, Shaanxi, China)
关键词:
隧道工程;  型钢钢架;  承载力计算;  喷射混凝土;  初期支护
Keywords:
tunnel engineering;  steel rib;  bearing capacity calulation;  shotcrete;  initial support
分类号:
U452
DOI:
10.19721/j.cnki.1671-8879.2025.04.006
文献标志码:
A
摘要:
针对型钢钢架-喷射混凝土是软弱围岩隧道初期支护的主要组成部分,但尚缺乏统一、完善的结构计算方法,造成支护设计存在盲目性的状况,给出型钢钢架-喷射混凝土初期支护的材料等效弹性模量和结构承载力计算方法; 结合算例进行型钢钢架-喷射混凝土初期支护不同结构承载力计算方法的对比分析,并对不同支护方案的初期支护结构承载力与工程经济性进行综合对比。研究结果表明:3种方法(截面抗弯刚度等效、截面抗压刚度等效和同时考虑截面抗弯刚度与抗压刚度等效)所得型钢钢架-喷射混凝土初期支护等效弹性模量的最大相对误差约为6%; 考虑型钢钢架翼缘对喷射混凝土的加强作用,将初期支护视为钢筋混凝土结构,或将型钢钢架-喷射混凝土初期支护完全视为型钢混凝土结构,该2种方法计算所得结构承载力相差约为9%; 鉴于安全考虑,推荐采用将型钢钢架-喷射混凝土初期支护视为钢筋混凝土结构的承载力计算方法; 若不考虑喷射混凝土强度增长过程,视型钢钢架与具有极限强度的喷射混凝土同步受荷,不同支护方案的初期支护承载力由大到小排序为I25a、HW200、I22a、HW175、I20b、I20a、HW150; 所需工程费用由大到小排序为HW200、I25a、HW175、I22a、I20b、I20a、HW150; 综合考虑结构承载力和工程经济性,I20a/b钢架优于HW175钢架,I22a钢架优于HW200钢架; 对初期支护早期强度和刚度要求高的情况,HW175钢架优于I22a钢架,HW200钢架优于I25a钢架。
Abstract:
In view of the fact that the steel rib and shotcrete are the main components of the initial support of weak surrounding rock tunnels, but there is still a lack of unified and perfect structural calculation methods, resulting in blind support design, this paper provided the calculation methods for the material equivalent elastic modulus and structural bearing capacity of the steel rib and shotcrete initial support. Combined with the calculation examples, the comparative analysis of different structural bearing capacity calculation methods for steel rib and shotcrete initial support was carried out. The bearing capacity and engineering economy of the initial support structure with different support schemes were comprehensively compared. The results show that the maximum relative error of the equivalent elastic modulus of the initial support of the steel rib and shotcrete obtained by three methods(equivalent bending stiffness of the section, equivalent compressive stiffness of the section, and both equivalent bending stiffness and compressive stiffness of the section)is about 6%. Considering the reinforcement effect of steel rib flanges on shotcrete, the initial support is considered as a reinforced concrete structure, or considering the steel rib and shotcrete initial support as a steel reinforced concrete structure, the difference in the calculated structural bearing capacity between these two methods is about 9%. In view of safety considerations, it is recommended to use the bearing capacity calculation method of steel rib shotcrete initial support as reinforced concrete structure. If the strength growth process of shotcrete is not considered, the steel frame and shotcrete with ultimate strength are considered to be loaded synchronously, the bearing capacity of initial supports with different support schemes is ranked as I25a, HW200, I22a, HW175, I20b, I20a, and HW150. The order of required engineering costs is HW200, I25a, HW175, I22a, I20b, I20a, and HW150. Considering the structural bearing capacity and engineering economy, I20a/b steel rib is superior to HW175 steel rib and I22a steel rib is superior to HW200 steel rib. However, HW175 steel rib is superior to I22 steel rib and HW200 steel rib is superior to I25 steel rib for the tunnels with high requirements for early strength and stiffness.10 tabs, 5 figs, 32 refs.

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备注/Memo

备注/Memo:
收稿日期:2024-12-17
基金项目:国家重点研发计划项目(2024YFB2606100); 国家自然科学基金重点项目(41831286)
作者简介:陈丽俊(1986-),男,山西运城人,副教授,工学博士,E-mail:chenlijun2004@126.com。
通信作者:陈建勋(1969-),男,陕西韩城人,教授,工学博士,E-mail:chenjx1969@chd.edu.cn。
更新日期/Last Update: 2025-07-25