Study on Influence of Hole-pile Method of Subway Station on Stratum in Loess Area
In order to study the influence factors of tunnel-pile method on surface settlement and vault settlement of metro station in water-rich sand layer in loess area,based on the Fenghe Road metro station project in Xi'an,the reinforcement range,excavation stagger distance and excavation sequence of pilot tunnel are numerically simulated.The results show that the reinforcement range has a great influence on the surface settlement and vault settlement of metro station in water-rich sand layer in this area.With the increase of reinforcement range,the stratum settlement gradually decreases.The excavation sequence of the pilot tunnel has a certain influence on the ground settlement in the area.The surface settlement and vault settlement caused by the excavation sequence of the first side and then the middle are smaller.The excavation offset of the pilot tunnel has little effect on the ground settlement in this area.With the increase of the excavation offset,the ground settlement gradually increases,but the degree of change is small.According to the results,the rationality of the construction arrangement of the tunnel pile method in the subway station in this area is further verified,that is,the reinforcement range of the 1.5m pilot tunnel is selected,the excavation staggered distance of 10m and the excavation sequence of the first side and then the middle.
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