| Artificial freezing is widely used in modern civil engineering because of its good adaptability to complex geological and hydrological conditions.At the same time,it also brings the danger of frozen soil to the project--the problem of freezing and melting.Scholars generally believe that the danger of frozen soil comes from the distribution of water in the process of artificial freezing strata.The distribution of water is mainly the phase transition of ice water and water migration.Therefore,it is of great significance to study hydrothermal migration mechanism of artificial frozen soil for the application of artificial freezing method.In this paper,the hydrothermal migration of artificial frozen soil is studied,and the following contents are mainly completed:(1)The freezing test of silty clay in Huainan area under closed conditions is carried out from top to bottom.The effects of cold end temperature,initial water content and overburden on hydrothermal migration of artificial frozen soil were obtained.(2)The hydrothermal migration coupling model of unsaturated artificial frozen soil is derived,and the PDE module of COMSOL Multiphysics software is developed twice,and the hydrothermal coupling numerical calculation of artificial frozen soil is realized.(3)By programming the random position calculation program of frozen tube slant by C++,the position of frozen tube with slant rate of not more than 0.15%is obtained;(4)The influence of deflection on the hydrothermal temporal and spatial distribution was obtained by numerical calculation of the hydrothermal migration in multi-coil tube with or without deflection.This paper provides a theoretical basis for the construction of artificial freezing method for clay which is silty clay,and provides a short time,low cost,high precision verification and optimization simulation for freezing pipe arrangement in artificial freezing method.Figure[89]table[12]reference[83]... |
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