重庆地铁素填土中浅埋暗挖施工方案比选

Discussion about Shallow Burying Underground Excavation Method Selection in Plain Filling Soil

以重庆地铁工程为例,运用Midas-GTS程序对施工斜井通过素填土层整个施工过程进行数值模拟,就台阶法和CRD法在开挖过程中对地表沉降影响、支护结构变形及应力分布等方面进行了分析。研究表明,在素填土层中采取CRD法施工更能有效地控制地表沉降、确保施工安全,为类似工程提供了较好的示范作用。

Taking Chongqing Metro engineering for example, this paper uses MIDAS-GTS to do the numerical simulation in the whole construction process of the incline shaft passing through plain filling soil, and analyzes the two construction methods-bench method and CRD---in terms of the influence on surface settlement in the construction process, support structure deformation and stress distribution. It shows that, in plain titling soil, CRD method can control the surface settlement more effectively and guarantee the safety of the construction, providing a better demonstration in the application of similar engineering.