摘要
为提高软弱破碎围岩交叉隧道施工的安全性,依托某铁路隧道工程,利用有限差分软件FLAC3D对3种施工方案进行比选。结果表明,(1)与交叉段主洞两端同时开挖方案相比,交叉段主洞右端超前开挖8 m后两端同时开挖方案的初期支护结构竖向位移减小28.60%,横向位移减小34.30%,最大主应力减小8.30%,最小主应力减小2.58%,安全系数提高72.60%;(2)交叉段主洞右端先开挖完成后再开挖左端方案的初期支护结构竖向位移减小38.20%,横向位移减小26.80%,最大主应力减小13.36%,最小主应力减小8.87%,安全系数提高113.70%;(3)交叉段主洞右侧先开挖完成方案施工安全性最优。研究成果可为类似软弱围岩交叉隧道施工提供参考。
To improve the safety of constructing tunnel crossing in weak and fractured surrounding rock,this paper relied on a railway tunnel project and employed the finite difference software FLAC3D to compare three construction schemes.The results indicate that(1)Compared with the simultaneous excavation at both ends of the main tunnel in the crossing section,the scheme where the right end of the main tunnel is advanced by 8 m before simultaneous excavation reduces the vertical displacement of the initial support structure by 28.60%,lateral displacement by 34.30%,maximum principal stress by 8.30%,minimum principal stress by 2.58%,and increases the safety factor by 72.60%.(2)The scheme where the right end of the main tunnel is fully excavated before the left end reduces the vertical displacement by 38.20%,lateral displacement by 26.80%,maximum principal stress by 13.36%,minimum principal stress by 8.87%,and improves the safety factor by 113.70%.(3)The scheme where the right end of the main tunnel is excavated first demonstrates the highest construction safety.The findings provide a valuable reference for similar tunnel construction projects in weak and fractured surrounding rock.
作者
侯文学
HOU Wenxue(The Fifth Engineering Co.,Ltd.of China Railway Fourteenth Bureau Group Co.,Ltd.,Jining 272100,China)
出处
《高速铁路技术》
2025年第3期113-118,共6页
High Speed Railway Technology
关键词
隧道工程
软弱破碎围岩
交叉段
施工方案
tunnel engineering
weak and fractured surrounding rock
crossing section
construction scheme
