Temporal and Spatial Variation Law of Temperature Field in Reinforcement and Water Stop with Pipe Curtain Freezing Method Under the Action of Seepage
In order to investigate the freezing law and its development trend of pipe curtain-frozen pipe structure on the ground,based on the temperature field and seepage field coupling module of finite element software,and with the background of the undersea tunnel project of Sanya Estuary Passage,we establish numerical model of pipe curtain freezing reinforcement under the action of different flow velocities,and simulate the evolution law of temperature field of the soil body as well as seepage field under different freezing conditions.And then,taking into account the spatial variability of soil thermal conductivity,a stochastic finite element model of submarine tunnel pipe curtain freezing method under seepage is constructed to analyze the influence of thermal conductivity uncertainty on the effectiveness of freezing reinforcement for water stopping.The study shows that:the effect of groundwater has a greater influence on the temperature at the upstream point,and vice versa at the downstream point;the uncertainty of thermal conductivity coefficient will slow down and hinder the formation of freezing curtain;the pipe curtain-frozen soil curtain support system formed by the pipe curtain freezing method is able to effectively reinforce the soil body,and even avoid the occurrence of engineering accidents under the large seepage condition.
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