既有山岭隧道扩建施工关键参数影响分析
Influence analysis of the key parameters in the expansion construction of existing mountain tunnels
张永忠 1刘东 2韩健勇 2王庆海 2张荣珍 2崔中全3
作者信息
- 1. 甘肃省武威公路事业发展中心,武威 733000
- 2. 山东建筑大学 土木工程学院,济南 250101
- 3. 济南中央商务区投资建设集团有限公司,济南 250101
- 折叠
摘要
为了给既有隧道扩建的设计和施工提供科学的指导,依托某既有山岭隧道扩建工程建立三维数值模型,通过与监测数据对比验证了计算模型的准确性,然后基于数值模型对施工方案进行了优化分析.研究结果表明:在考虑现场施工进度和安全性的前提下,建议循环进尺为2.0 m;锚杆长度与围岩变形呈现负相关,锚杆纵向间距与围岩变形呈现正相关,当锚杆纵向间距超过1.0 m时,围岩变形显著增大,建议采用长度3.0 m,纵向间距1.0 m的锚杆进行支护.研究结论可为类似的工程提供参考和依据.
Abstract
In order to provide scientific guidance for the design and construction of the expan-sion of existing tunnels,a three-dimensional numerical model was established based on an existing mountain tunnel reconstruction and expansion project.The accuracy of the calcula-tion model was verified by comparing it with the monitoring data,and then the construction plan was analyzed and optimized based on the numerical model.The results show that con-sidering the construction progress and safety on site,the cycle footage is recommended to be 2.0 m.The length of the bolts is negatively correlated with the deformation of the surround-ing rock,and the longitudinal spacing of the bolts is positively correlated with the deforma-tion of the surrounding rock.When the longitudinal spacing of the bolts exceeds 1.0 m,the deformation of the surrounding rock increases significantly.It is therefore recommended that anchor rods with a length of 3.0 m and a longitudinal spacing of 1.0 m should be used for support.The research conclusions can provide reference and basis for similar projects.
关键词
隧道工程/隧道扩建/锚杆/扩挖方案/数值模拟Key words
tunnel engineering/tunnel expansion/anchor/expansion scheme/numerical simu-lation引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据