A method for predicting the effective thermal conductivity of solid-liquid-gas three-phase unsaturated concrete

Abstract

The invention provides a method for predicating the effective heat conduction coefficient of solid-liquid-gas three phase unsaturated concrete, and relates to the technical field of surrounding rocksheat dissipation. The method comprises the following steps: simplifying the pore distribution function of the concrete; obtaining relevant parameters for predicting the effective heat conduction coefficient of the solid-liquid-gas three phase unsaturated concrete by similar experiments; considering water and air in pores as a parallel model along a heat flow direction to determine the heat conduction coefficient of the dispersion phase of the concrete; determining the heat resistance of the concrete; and determining the effective heat conduction coefficient of the solid-liquid-gas three phaseunsaturated concrete according to a heat resistance model. The method for predicating the effective heat conduction coefficient of the solid-liquid-gas three phase unsaturated concrete can easily andeffectively realize the predication of the effective heat conduction coefficient of unsaturated concrete without individually measuring every test piece and calculating parameter values needed by theeffective heat conduction coefficient of the unsaturated concrete, so the workload of experimenters is greatly saved.

Description

technical field [0001] The invention relates to the technical field of surrounding rock heat dissipation, in particular to a method for predicting the effective thermal conductivity of solid-liquid-gas three-phase unsaturated concrete. Background technique [0002] With the extension of the mining level of my country's coal mines, the number of high-temperature mines and the degree of heat damage have increased year by year. High-temperature heat damage has become a bottleneck factor restricting the development of the coal industry in deep mine mining technology. The increasingly severe mine high temperature has become a common problem faced by coal mining. , is also a basic problem that cannot be avoided and must be solved. The heat dissipation of surrounding rock is one of the main factors that cause high-temperature heat damage in mines, and heat-insulating concrete can effectively reduce the heat dissipation of surrounding rock. Therefore, it is necessary to be effective f...

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Problems solved by technology

In recent years, domestic scholars have carried out research on the improvement of the effective thermal conductivity of concrete with external admixtures, but there are few studies on the calculation method of the effective thermal conductivity of solid-liquid-gas three-phase unsaturated concrete, and the current calculation method has a relatively heavy workload. is large, all parameters needed to calculate the effective thermal conductivity are measured for each specimen

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