Method for calculating model frozen soil thermal parameters based on similarity theory

Abstract

The invention provides a method for calculating frozen soil model thermal parameters based on a similarity theory. The method comprises the steps: with use of specific heat and thermal conductivity coefficients of original soil at different negative temperatures, fitting to obtain a changing curve of the specific heat and thermal conductivity coefficients of the original soil along with the temperature, and calculating latent heat of the original soil with per unit volume; according to a geometric dimension shrinkage ratio of the prototype and a model, determining a geometric similarity constant Cl, namely a; if the density of the prototype soil is [rho]p and the density of the model soil is [rho]m, determining the soil density similarity constant C[rho], namely the ratio of the [rho]p tothe [rho]m; if the cold source temperature of the prototype is Tp and the cold source temperature of the model is Tm, determining the temperature similarity constant CT, namely the ratio of the Tp tothe Tm; and according to the determined similarity constant of the physical parameters, calculating to obtain the thermal parameters of frozen soil. The method has the effects that the calculation method makes up calculation of the thermal parameters of the model soil in the frozen soil temperature field model test, the calculation error is less than 0.1 DEG C, the accuracy satisfies the application of thermal value in actual engineering, and thus the accuracy of the model test results is ensured.

Description

technical field [0001] The invention relates to a method for calculating thermal parameters of model frozen soil based on similarity theory, which is mainly used for determining thermal physical parameters of model soil in soil freezing model tests. Background technique [0002] Model test is an important means to study the occurrence mechanism and development law of complex physical phenomena, and the similarity criterion is the theoretical basis of model test design. The model test is to make the prototype into a model according to a certain geometric-physical relationship, and use the model instead of the prototype to carry out the test, and the test results are reversed to the prototype according to the corresponding similarity criterion. [0003] The artificial freezing method has been widely used in the construction of tunnels, foundation pits and other geotechnical projects due to its advantages such as little impact on the surrounding environment during the construct...

AI Technical Summary

Problems solved by technology

[0005] Accurate and reasonable calculation of thermal physical parameters of model soil is the basis for preparing model soil, but the existing research has not given the calculation method of thermal physical parameters of model soil

Images