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

作　　者：张永忠 刘东 韩健勇 王庆海 张荣珍 崔中全 ZHANG Yongzhong;LIU Dong;HAN Jianyong;WANG Qinghai;ZHANG Rongzhen;CUI Zhongquan(Wuwei Highway Development Center of Gansu Province,Wuwei 733000,China;School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China;Jinan Central Business District Investment and Construction Group Co.Ltd.,Jinan 250101,China)

机构地区：[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

出　　处：《青岛理工大学学报》2024年第1期82-87,95,共7页Journal of Qingdao University of Technology

基　　金：甘肃省科技计划项目(22YF7FH224)。

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。In order to provide scientific guidance for the design and construction of the expansion of existing tunnels,a three-dimensional numerical model was established based on an existing mountain tunnel reconstruction and expansion project.The accuracy of the calculation 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 considering 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 surrounding rock,and the longitudinal spacing of the bolts is positively correlated with the deformation 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 

分 类 号：U457.6[建筑科学—桥梁与隧道工程]