新建城市隧道上跨既有高铁隧道稳定性控制研究

Study on Stability Control of New Urban Tunnel across Existing High-speed Rail Tunnel

基于侨城东路北延通道工程城市隧道上跨广深港高铁隧道的工程背景,总结城市隧道上跨铁路隧道的案例,得到减震、减小围岩扰动的施工方式。采用数值模拟的方法进行开挖扰动安全性分析,并采用理论计算的方式进行爆破振动安全分析,提出施工组织设计方案与结构稳定性控制措施。

With the continuous development of national traffic tunnel construction,more and more urban tunnels go cross existing railway tunnels,which sets up high standards for the construction quality.In this paper,we propose a method based on the construction organization design scheme and structural stability control measures.Our method is validated through case studies on the Qiaocheng East Road north extension passage across the Guangzhou-Shenzhen-Hong Kong high-speed railway tunnel.In these case studies,we obtain the construction method of shock absorption and reduction of surrounding rock disturbance.We also analyse the excavation disturbance safety using numerical simulation method,and conduct the blasting vibration safety analysis through theoretical calculation.