盾构快速穿越法超浅覆土及负覆土隧道施工预测分析

盾构快速穿越(ultra-rapid under pass, URUP)法隧道施工技术是一种盾构机从地表直接始发掘进, 最后在设定目标地点直接掘进到地表的新型施工方法. 以南京机场城轨URUP法隧道示范工程为背景, 利用三维非线性有限元方法(finit element method, FEM), 对URUP 法隧道施工过程进行了数值模拟. 预测分析了隧道施工过程中超浅覆土和负覆土区间的地表变形规律、施工影响范围以及最终沉降值. 分析结果与实测数据比较吻合, 说明了数值模拟的有效性和预测分析的可信性.

Predictive analysis on shield tunnel using ultra-rapid under pass method

Ultra-rapid under pass (URUP) is a new shield construction method. The shield machine directly excavate from surface of the beginning section to the surface of
the target location. Based on the demonstration project of Nanjing shield tunnel using the URUP method, the whole shield construction process is simulated with a three dimensional nonlinear finite element method (FEM). The ground surface subsidence, the affected area, and the final settlement of ultra-thin ground coverage and partially out of the ground in the shield process are predicted and analyzed. Comparison with the measured data shows that the calculation is reliable. The results provide useful guidance to the project, and may be used as a reference for analysis of similar projects