关键词: 轨排井, 围护结构, 主体结构, 双排桩, 三维模型

Abstract: Rail shaft is a vertical rectangular opening from the ground surface to the metro level and is necessary in some of the metro stations in order to lift the rail tracks to the metro elevation. The rail shaft requires that no internal support can be installed during the metro track installation. Large cantilever arm is required and the stress concentration is also identified in this opening. Different from the supporting structure for the rail shafts for the conventional double story metro stations, the supporting structure for the rail shaft for the single layer has large cantilever arm and higher pore pressure. In order to ensure the safety of the rail shaft and the adjacent structures, the supporting structure utilized double row of HP piles in cased in the castinplace concrete columns based on the subsurface conditions. The stiffener beam was installed at both sides of the opening. Further, the sizes of the structures are determined throughout the three dimensional numerical analysis models since the three dimensional model has a better results in the safety and cost aspects over the two dimensional model. Both the numerical analysis and the construction monitoring results demonstrated that both the supporting structure and the main structure design were successful

Key words: Rail Shaft, Supporting Structure, Main Structure, DoubleRow Piles, Three Dimensional Model