为研究富水砂层中冻结法施工的可行性及其对周围地层的影响，根据相关工程水文地质条件和冻结施工方案，通过ANSYS建立三维热固耦合数值模型，数值模拟计算结果与现场实际监测数据相印证，探明了冻结法施工过程中的地层温度扩散分布规律及地层变形响应特性。结果表明： 1）在0~7 d时，冻结管周围土体温度下降明显，随着冻结时间增加至20 d，温度变化增大，降温范围也进一步扩大，冻结至30 d时，降温范围不再发生明显变化； 2）在冻结30 d时，联络通道四周的冻结帷幕厚度均已达到2.4 m，满足设计要求； 3）对比现场监测点和数值模拟结果可知，两者的地表沉降变化趋势和变化量值整体来看较为吻合。
In order to study the feasibility of freezing method in water-rich sand stratum and its influence on surrounding strata, based on the hydrogeological conditions and specific freezing construction schemes of projects, a three-dimensional thermo-solid coupling numerical model is established through ANSYS. The calculation results are corroborated by actual monitoring data, and the ground temperature diffusion distribution law and ground deformation response characteristics in frozen construction are proved. The results show that: (1) In the first 0~7 days, the soil temperature around freezing pipes drops significantly; as the freezing time increases to 20 days, the temperature change increases, and the cooling range expands further; when it has been frozen for 30 days, the cooling range no longer changes significantly. (2) After 30 days of freezing, the thickness of the freezing curtain around connecting passage has reached 2.4 m, which meets the design requirements. (3) Analyzing the on-site monitoring points and the numerical simulation results, it can be seen that their surface subsidence variation trend and value are consistent overall.
