冻结管差异温度强化冻结试验与数值分析

Intensified Freezing Tests and Numerical Analysis on Differential Temperatures of Freezing Pipes

针对立井冻结工程中存在的局部难冻结地层,为对其强化冻结,提出了冻结管差异温度强化冻结方案。为验证差异温度的强化冻结效果,进行了单管冻结试验,同时基于有限体积法(FVM)原理,进行了强化冻结段-35℃、-40℃和-45℃三种条件下的单排管三维数值分析,并研究了冻结管上、下不同温度段的冻结温度场分布规律及冻结壁特征。结果表明:冻结管内可实现差异温度冻结,冻结管强化冻结段可显著增加冻结壁厚度、降低冻结壁平均温度并强化地层的冷能耗散,使局部地层受到强化冻结。

According to local difficult freezing stratum existed in the mine freezing shaft project, in order to intensify the freezing, an intensified freezing plan with differential temperatures of the freezing pipes was provided. In order to verify the intensified freezing effect with the differential temperatures, a single pipe freezing test was conducted. Based on the FVM principle, a 3D numerical analysis was conducted on the single freezing pipe of the intensified freezing section under three conditions of -35 ℃, -40℃ and -45℃ and a study was conducted on the freezing temperature filed distribution law and the freezing wall features of the freezing pipe with top and low section different temperatures. The results showed that a deferential temperature freezing could be realized in the freezing pipe, the intensified freezing section of the freezing pipe could obviously increase the thickness of the freezing wall, could reduce the average temperature of the freezing wall and the cold energy dissipation of the intensified stratum, and could make a intensified freezing of the local stratum.