江底联络通道冻结加固设计及温度场规律分析

Freezing Reinforcement Design and Temperature Field Regulation Analysis on Contact Passage under River Bottom

以杭州地铁5号线某区间江底联络通道工程作为背景,采用水平冻结法加固设计。通过有限元软件ANSYS建立联络通道三维计算模型,进行数值模拟,研究冻结壁形成规律。研究结果表明:冻结壁有效厚度、平均温度均满足冻结设计要求,证明了冻结设计的合理性;对比分析数值模拟结果与工程实测数据,结果表明二者发展规律基本一致,最大温差为1.7℃,验证了数值模型的正确性;土体温度变化可分为:温度快速下降、相变、温度下降、温度稳定这四个阶段,距离冻结管越近,土体降温速率越明显。

Based on a contact passage engineering under the river bottom between certain sections in No.5 Line of Hangzhou Metro System as a background,a reinforcement design with a horizontal freezing method was applied.With a finite element software ANSYS applied to set up a 3 D calculation model of the contact passage,a numerical simulation was conducted and a formation law of the freezing wall was studied.The study result showed that an effective thickness and average temperature of the freezing wall all could meet the requirement of the freezing design and had proved the rationality of the freezing design.A comparison analysis was conducted between the numerical simulation result and engineering measured data and the results showed the development law of the results and the data was basically the same.The max temperature difference was 1.7℃and the correctness of the numerical simulation was proved.The soil temperature variation could be divided into four stages as a temperature rapid declined,phase change,temperature declined and temperature stabilized.When the distance closed to the freezing pipe,the temperature declined rate of the soil would be more obvious.