Research on Optimization of Section Excavation Sequence Technique of Double-side Excavation Method for Underground Railway Project
This article optimizes the excavation sequence of the traditional double-sided excavation method based on the actual situation of un-derground railway engineering.Using Midas/GTS software for finite element analysis,calculate ground settlement and displacement and inter-nal forces of support structures under two different excavation sequences of cross-sections.The experimental results show that there is a small difference in the settlement values of the arch bottom between Scheme II and Scheme I,with average values of 0.53 mm and 0.38 mm,respec-tively.In addition,the excavation of the arch top and lower guide tunnel of Scheme II has a relatively small impact on the displacement of the initial support of the tunnel.The settlement values of the arch crown and left and right arch feet in Scheme II are 4.6%,77.8%,and 44.1%lower than Scheme I,respectively.The optimized construction plan not only ensures the safety and stability of the tunnel structure,but also greatly improves construction efficiency,providing construction reference for tunnel construction under similar engineering conditions.
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