The temperature control device of the pressure chamber of the hollow cylinder instrument in frozen soil

Abstract

The invention relates to a temperature control system for a hollow cylinder pressure chamber in frozen soil, which is characterized in that a double-helix cooling bath circulation groove is engraved on the wall of the pressure chamber, and the cooling bath circulates in the circulation groove to reduce the temperature of the pressure-bearing heat transfer medium inside the pressure chamber. There is an inverted U-shaped copper tube and a temperature sensor in the inner cavity of the hollow cylindrical sample. The three temperature sensors are distributed on the upper, middle and lower positions of the outer wall of the sample. The data is fed back to the cooling bath controller, and the upper and lower temperature sensors monitor the temperature fluctuations in the corresponding positions. The pressure chamber is equipped with upper and lower cold plates to reduce the heat exchange between the pressurized heat transfer medium in the pressure chamber and the outside world, and adjust the temperature of the pressure chamber through the movement of the cold bath in the cold plate. The invention can rapidly lower the temperature of the sample, ensure that the temperature of the sample is uniform and constant during the whole test period, and is not affected by the temperature change of the external room, and provides a technical guarantee for revealing the mechanical properties of frozen soil under the action of complex stress paths.

Description

technical field [0001] The invention relates to a temperature control device for a pressure chamber of a hollow cylinder instrument for frozen soil, that is, a test device for indoor mechanical parameter testing of frozen soil under complex stress path conditions. Using this device, the cooling and constant temperature process of the hollow cylinder of frozen soil can be realized during the dynamic, static and torsional loading of the hollow cylinder instrument, so that the sample can reach the temperature accuracy required by the mechanical test, and finally ensure the mechanical parameters of the frozen soil. The accuracy of the determination. Background technique [0002] Soil properties are affected by the stress path. Ideally, only the indoor test conditions can completely simulate the real loading process to reflect the real response of the soil, especially under dynamic conditions. The most common dynamic loads in engineering construction in cold regions, such as ear...

AI Technical Summary

Problems solved by technology

Since this method does not consider the pressure bearing capacity of the copper tube and the heat exchange between the upper and lower ends of the pressure chamber and the surrounding environment, the copper tube is crushed under high pressure and cannot work, and the temperature uniformity inside the pressure chamber is very poor. (The temperature difference between the top and bottom of the sample is always within ±1 o C or above), and the ambient temperature fluctuates greatly day and night

These design flaws make it impossible to carry out experimental research on the mechanical properties of frozen soil under complex stress path conditions with the existing hollow cylindrical instrument for frozen soil

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