Building Pile Chongqing Huangnibang Shallow Light Rail Station Impact Study

According to the existing specifications and standards, high-rise buildings will notbe built around the tunnel within30m, but this will cause a huge waste of urban land,also affect the overall urban layout. For exploring this problem, this article willpreliminarily study the influence of new pile foundation on existing tunnels.This paper, relying on light rail station of the Chongqing rail transit line6yellowpounds of large cross section, adopting the method of finite element numericalsimulation, analyzes the following three questions:(1)Analysis of the effect of single pile on the tunnel top and side on the stress anddisplacement of tunnel lining. When the pile effects in the upper tunnel, the verticaldistance between the tunnel vault and pile bottom has the largest influence on tunnel.When the pile effects in tunnel profile, the horizontal distance between the tunnel axisand pile foundation affects the tunnel greatest.(2)Analysis of the position of single pile on the upper and profile tunnel canguarantee pile foundation’s the minimal impact on the safety of the tunnel. When thepile effects in the upper tunnel, and the vertical distance between the tunnel vault andpile bottom is greater than or equal to3times the pile diameter, pile foundation on theinfluence of the tunnel will be reduced to a minimum. When the pile effects in tunnelprofile, and the horizontal distance between pile foundation edge and the outer edge ofthe tunnel side wall is greater than or equal to3m, pile foundation will have a minimuminfluence on the tunnel.(3)Analysis of pile spacing of pile group in the upper and profile tunnel canguarantee pile foundation’s the minimum influence on tunnel safety. When the pilegroup effect in the upper tunnel and the vertical distance between the tunnel vault andpile bottom is not less than three times the pile diameter, pile spacing is greater than orequal to3.5times the pile diameter, pile group effect on the tunnel will be reduced to aminimum. When the pile group effect to tunnel profile, and the horizontal distancebetween pile foundation edge and the outer edge of the tunnel side wall is greater thanor equal to3m, the pile spacing’s effect to the tunnel will be minimal. Under the rulesof pile spacing, it can ensure the safety of the tunnel.The conclusion indicates that within the prescribed scope of existing specifications and standards, there exists new pile foundation and it also ensures the tunnel’s safety.This conclusion can also provide similar design project with references.