摘要
复合式衬砌考虑初期支护与二次衬砌分别承担一定比例的围岩压力,经监测发现初期支护承担了主要的围岩荷载,结构设计的安全性无法证实。依托中兰铁路香山隧道,以初期支护承担100%荷载、二次衬砌作为安全储备来优化复合式衬砌,并在现场设置试验段进行结构安全性测试。优化后的初期支护结构施作20 d左右趋于稳定,Ⅳa衬砌、Ⅴa衬砌支护结构均安全可靠。经过效益对比,衬砌优化后施工效率提高、支护材料用量降低。以初期支护为主要承载结构的复合式衬砌优化设计安全可行。
In conventional composite tunnel linings,the initial support and secondary lining each share a portion of the surrounding rock pressure.However,field monitoring indicates that the initial support often bears the majority of the load,leaving the sturctural safety of the design unverified.Based on the Xiangshan Tunnel of the Zhongwei-Lanzhou Railway,this study proposes an optimized composite lining scheme whereby the initial support is designed to carry 100%of the load,and secondary lining functions as a safety reserve.A test section was constructed on-site to evaluate the structural performance and safety.The results show that the optimized initial support structure stabilizes approximately 20 days after installation,and bothⅣa andⅤa support systems remain safe and reliable.Furthermore,a comparative analysis reveals enhanced construction efficiency and reduced consumption of support materials under the optimized design.Therefore,the optimized composite lining,in which the initial support serves as the primary load-bearing element,proves to be a safe and feasible approach.
作者
傅新明
张宏
于海涛
FU Xinming;ZHANG Hong;YU Haitao(Yinchuan Engineering Construction Command Headquarters of China Railway Lanzhou Bureau Group Co.,Ltd.,Yinchuan 750000,China;China Railway Fifth Survey and Design Group Co.,Ltd.,Beijing 102600,China)
出处
《国防交通工程与技术》
2025年第1期4-8,共5页
Traffic Engineering and Technology for National Defence
关键词
隧道工程
复合式衬砌
结构安全
初期支护
现场试验
tunnel engineering
composite lining
structural safety
initial support
on-site testing
