Mesoscale numerical research method of equivalent thermal conductivity of rock and soil

Abstract

The invention relates to a mesoscale numerical research method of the equivalent thermal conductivity of rock and soil bodies. Aiming at the heterogeneous characteristics of rock and soil, the present invention aims at soil, the most common material in geotechnical engineering, from the perspective of mesoscopic scale, and establishes a simulation model based on a finite element numerical method to estimate its equivalent thermal conductivity. The established numerical model is simulated by the Monte Carlo algorithm to obtain a soil structure with spatial randomness. Combining the finite element calculation method and the Fourier formula based on steady-state analysis, the equivalent thermal conductivity of the soil in three cases is calculated. Comparative analysis, and explore the influence of soil type, porosity, saturation, spatial arrangement of dispersed phase and other factors on the equivalent thermal conductivity of soil. Starting from the mesoscopic scale, the present invention proposes a method for simulating the heterogeneity of the internal structure of rock and soil, which provides a new idea for analyzing its thermal conductivity, and the simulation method is simple, fast and convenient.

Description

technical field [0001] The invention belongs to the field of research on the properties of multiphase composite materials, and in particular relates to a mesoscale numerical research method of the equivalent thermal conductivity of rock and soil bodies. Background technique [0002] Many materials in geotechnical engineering are considered as multiphase composite materials. For example, soil is usually regarded as a multiphase system consisting of soil skeleton, air, water and ice. Geotechnical materials play an important role in environmental and engineering applications, and their thermal properties are one of the most critical parameters of geotechnical materials. Thermal conductivity, convective heat transfer coefficient and specific heat capacity are the main factors affecting the thermal behavior of soil, among which thermal conductivity is the most critical parameter reflecting heat transfer capability, which has important applications in geothermal energy development...

AI Technical Summary

Problems solved by technology

This method only needs to determine the input parameters of the formula to obtain the equivalent thermal conductivity, which is beneficial to the estimation of the properties of various materials, but this prediction method is largely affected by the physical model, and can only be used as a practical project. An easy way to make predictions

[0008] Multiphase materials have strong heterogeneity and are affected by many factors at the same time, so the determination of the thermal conductivity of multiphase composite materials is more complicated

However, none of the above methods can independently explore the influence of a single factor on the equivalent thermal conductivity of multiphase composites.

Images