变直径冻结管冻结温度场发展规律数值分析

Numerical Analysis on Development Law of Freezing Temperature Field of Variable Diameter Freezing Pipe

运用有限元软件建立了三维数值模型,并针对变直径冻结管冻土壁温度场的发展和分布规律进行了研究.数值计算表明:在30天到40天时强弱区的最终冻土厚度均为0. 5 m,其中,弱区的最小半径为0. 03m,冻土厚度达到0. 5 m,半径未达到0. 03 m时,冻土厚度无法达到要求;强弱区交界处的冻土厚度并不受强弱区域的影响,其冻土厚度保持在0. 5 m.所得结果可为今后类似的工程设计提供理论依据.

In the report,the finite element software was used to construct a three-dimensional numerical model and study the development and distribution of the wall temperature field of frozen tundra with variable diameter.The numerical calculation results showed that the ultimate thickness of the permafrost in the strong and weak zones of 30 d to 40 d is 0. 5 m. The minimum radius of the weak zone is 0. 03 m,which makes the thickness of the permafrost reach 0. 5 m. The thickness of permafrost at the junction of strong and weak areas is not affected by the strong and weak areas,and the thickness of permafrost is kept at 0. 5 m. The results can provide theoretical basis for similar engineering design in the future.