复杂偏压大跨连拱隧道开挖围岩稳定性研究  

Study on Stability of Surrounding Rock in Excavation of Complex Unbalanced Long-span Double-arch Tunnel

作　　者：张明 毛勇 张馨元 周小涵 王 ZHANG Ming;MAO Yong;ZHANG Xinyuan;ZHOU Xiaohan;WANG Yan(China Railway Bridge Survey and Design Institute Group Co.,Ltd.,Wuhan 430056,China;Nanjing Public Works Construction Center,Nanjing 100088,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]中铁大桥勘察设计院集团有限公司,武汉430056 [2]南京市公共工程建设中心,南京100088 [3]重庆大学土木工程学院,重庆400045

出　　处：《交通科技》2023年第4期72-76,共5页Transportation Science & Technology

摘　　要：连拱隧道作为一种特殊的隧道形式广泛应用于公路隧道建设中,文中以南京乌龙山隧道为背景,通过分析现场检测数据和数值模拟结果,研究不同偏压程度下,浅埋偏压大跨连拱隧道开挖力学响应特征。结果表明,地表坡度对偏压隧道开挖引起的拱顶沉降和拱腰侧向位移有显著影响,且浅埋侧拱腰侧向位移大于深埋侧;中隔墙对连拱隧洞开挖过程中限制围岩变形和边坡稳定性影响显著,这是因为初支和中隔墙形成的整体结构限制了围岩变形并增强了坡体的稳定性。As a special tunnel form,multi-arch tunnels are widely used in the construction of highway tunnels.Taking the Wulongshan Tunnel as the background,through the analysis of on-site inspection data and numerical simulation results,the mechanical response characteristics of shallow-buried bias-pressure large-span multi-arch tunnel excavation under different bias levels is studied.The research shows that the surface slope has a significant impact on the vault settlement and the lateral displacement of the arch waist caused by the excavation of the unbalanced tunnel,and the lateral displacement of the shallow-buried side arch waist is greater than that of the deep-buried survey.The middle partition wall has a significant impact on limiting the deformation of surrounding rock and enhancing the slope stability.This is because that the overall structure formed by the primary support and the intermediate partition wall limits the deformation of the surrounding rock and enhances the stability of the slope.

关 键 词：偏压连拱隧道 现场监测 数值模拟 稳定性 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]