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基于多孔介质传热和渗流理论,建立渗流场和冻结温度场的耦合数学模型,采用有限元方法模拟了某地铁隧道与车站对接的加固工程中冻结温度场变化和冻结壁形成过程.研究表明,在矩形布孔方式下横向水平流作用的冻结壁呈不均匀对称状,垂直于地下水流向的冻结壁形成慢,平行于流向的冻结壁形成较快,且上游冻结壁厚度薄,下游冻结壁厚度大;在交圈时间上,垂直于流向的冻结壁中部交圈迟缓;流速的改变对上游冻结壁平均厚度影响最为显著.
Based on the theory of heat transfer and seepage in porous media, a coupled mathematic model of seepage field and freezing temperature field is established, and the variation of freezing temperature field and the formation of frozen wall in a subway tunnel and station docking station are simulated by finite element method In the rectangular hole pattern, horizontal freeze-flow wall is symmetrical. The frozen wall perpendicular to the flow of groundwater forms slowly, the frozen wall parallel to the flow direction forms fast, and the thickness of the frozen wall in the upstream is thin. The thickness of the frozen wall in the downstream In the time of the circle, the middle of the frozen wall perpendicular to the flow direction lags slowly. The change of the flow velocity has the most significant influence on the average thickness of the frozen wall upstream.