【摘要】 以北京地铁某新建线路的区间隧道下穿越既有线区间隧道工程为背景,在对应力释放率进行合理确定并充分考虑既有线沉降缝和管棚加固区影响的基础上,采用FLAC^3D计算方法,对施工开挖过程进行模拟,得出了既有线影响段的沉降,并对该结果进行了分析,为既有线结构的安全性评估、施工过程的控制、监控量测提供了技术支持.更多还原

【Abstract】 The metro tunnel of a newly constructed line that crosses underneath the tunnel of the existing line in Beijing has significant effects on the adjacent tunnels.Based on the FLAC^3D numerical model and the stress release method,concerning on the settlement slot of the existing metro tunnel and steel tube pre-reinforced construction of the newly constructed line,the process of tunneling is simulated and the settlement of the influenced part of the existing line is obtained.The result is analyzed subsequently.The conclusions of this paper may help evaluate the security of the existing metro tunnel,control the construction process,and actu- alize the monitoring during tunneling.更多还原