Study on temporal and spatial distribution law of thaw settlement displacement by horizontal freezing method

Abstract

After freezing construction, the damage caused by thawing settlement mainly comes from the displacement and settlement of strata, which leads to uneven settlement of underground pipelines and surface buildings in the project area. In this paper, based on the three-dimensional finite element analysis, the settlement displacement field of artificial frozen soil in a subway connecting passage is analyzed, and the parameters such as elastic modulus, density and specific heat change with temperature are considered in the model. The change of mechanical parameters in the soil layer is given by the temperature field, which makes the mechanical parameters of each point in the soil layer different. In addition, the temperature field of the soil layer changes with time, and finally makes the mechanical parameters change point by point, so as to ensure that the simulated melting and settlement calculation process is more in line with the actual working conditions. The calculation results of settlement displacement show that the settlement displacement field of soil layer changes nonlinearly with time and space. The research results of this paper provide reference for the position and time node of the control measures of thawing settlement.