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本文以北京某地铁站为工程背景,采用FLAC3D软件建立“地层-结构”相互作用三维有限差分模型对PBA法扩挖车站的施工过程进行三维数值模拟,重点研究了各个施工阶段梁-中柱体系的力学特性。结果表明:随着扩挖施工的进行,梁-中柱的最大主应力一直在增大,当车站施工完毕时,最大主应力达到最大值;当拆除盾构上部管片后,梁-中柱的最大主应力急剧增大,随后的施工过程中增幅很小。
In this paper, a subway station in Beijing is taken as the engineering background. By using FLAC3D software to establish 3D finite difference model of “stratum-structure” interaction, three-dimensional numerical simulation of the construction process of PBA excavation station is made. Mechanical properties of the column system. The results show that the maximum principal stress of beam-center column increases with the excavation construction. When the station construction is completed, the maximum principal stress reaches the maximum value. When the shield upper segment is removed, the beam-center column The maximum principal stress sharply increased, followed by a small increase in the construction process.