考虑全寿命周期围岩冻结规律的寒区隧道抗冻设计研究
Frost-Resistant Design of Cold Region Tunnels Considering Freezing Patterns of Surrounding Rocks During a Full Lifecycle
夏才初 1曹善鹏 2陈维 3郭阔 3李干1
作者信息
- 1. 宁波大学岩石力学研究所,浙江 宁波 315211;宁波市能源地下结构重点实验室,浙江 宁波 315211
- 2. 同济大学地下建筑与工程系,上海 200092
- 3. 吉林省交通规划设计院,吉林 长春 130021
- 折叠
摘要
为解决寒区隧道全寿命周期内冻害问题,考虑寒区隧道全寿命周期围岩冻结和冻胀敏感性,通过数值分析和理论计算研究寒区隧道围岩冻结的发展规律和冻胀力荷载分布特征,并提出基于冻胀力荷载分级的寒区隧道全寿命周期分段抗冻设计方法.研究表明:1)全寿命周期内寒区隧道围岩的冻结深度在运行初期迅速增大,然后逐渐保持稳定,围岩冻结深度的发展速度主要与年平均气温和年气温振幅相关;2)寒区隧道冻胀力荷载随冻结深度的增大而增大,全寿命周期的最大冻胀力荷载沿纵向呈现出显著的非均匀分布特点;3)采用基于全寿命周期冻胀力荷载分级的分段抗冻设计可避免寒区隧道全寿命周期的冻害风险,同时提高抗冻支护的经济效益.
Abstract
Tunnel frost damage during a full lifecycle in cold regions is challenging and should be addressed.Thus,based on the sensitivity of the freezing and frost heave of surrounding rocks,the development of freezing patterns and the distribution characteristics of frost-heave force in the surrounding rocks of the tunnel in cold regions are examined using numerical analyses and theoretical calculations,proposing a segmented frost-resistant design method.The findings are as follows:(1)The maximum freezing depth of tunnel surrounding rocks in cold regions during the full lifecycle rapidly increases in the early stages of operation and gradually stabilizes after that.The development speed of the freezing depth of the surrounding rocks is primarily related to the annual average temperature and the annual temperature amplitude.(2)The frost-heave force of tunnels in cold regions increases with increasing freezing depth.The maximum frost-heave force during the full lifecycle of tunnels in cold regions exhibits a significant longitudinal nonuniform distribution.(3)The segmented frost-resistant design based on the full lifecycle frost-heave force grading can minimize the risk of frost damage throughout the full lifecycle of tunnels in cold regions,improving the economic benefits of frost-resistant support.
关键词
寒区隧道/冻胀力荷载/围岩冻结规律/分段抗冻设计/全寿命周期Key words
tunnels in cold regions/frost-heave force/surrounding rock freezing pattern/segmented frost resistance/full lifecycle引用本文复制引用
基金项目
国家自然科学基金资助项目(51778475)
吉林省交通运输创新发展支撑(科技)项目(2021-1-5)
出版年
2024
NETL
NSTL
万方数据