冷冻管直径对冻土冻结影响规律的试验研究

Experimental Study on the Influence Law between Frozen Soil and Freezing Tube Diameter

摘要:

近年来冻结施工方法越来越多地使用在城市土木工程施工中，但由于受冻土冻结理论基础的缺失和研究方法的局限，长时间以来人们对冻结法的设计始终没有找到较为理想的方案，参数变量选取遇到很大困难，同时在施工阶段没有较为标准统一的技术规范参照，使得该工法的实际应用往往出现工程量浪费、施工混乱和工程质量无保障等情况，而其中冷冻管直径是主要影响参数。通过同轴管土体冻结试验的研究，采用不同直径的冷冻管进行冻结试验，利用Fluent模型分析冻结过程的温度场分布规律，确定了最优冷冻管管径的选择方法，为冻结法的设计及施工提供依据。

Abstract:

In recent years, freezing construction method has been increasingly used in urban civil engineering construction; however, due to the insufficient theoretical basis on permafrost freezing and the limitation of research methods, the ideal scheme for freezing method design has not been found for a long period of time, great difficulties were encountered in parameters variable selection. And there were no relatively unified technical standard as reference in the construction, which causes large engineering quantity waste and construction chaos with no quality assurance for this construction method. Freezing tube diameter is the main influencing parameter. Through the research on the soil freezing tests in coaxial tubes of different tube's diameter, the distribution law of temperature field in the freezing process was analyzed by using Fluent model, the selection method for optimal freezing tube diameter is finally determined, which provides the basis for the design and construction of the freezing method.