Frozen soil hollow cylinder apparatus pressure chamber temperature control device

Abstract

The present invention relates to a frozen soil hollow cylinder pressure chamber temperature control system. The frozen soil hollow cylinder pressure chamber temperature control system is characterized in that a double helix cold bath circulating slot is carved on the outer wall of a pressure chamber, and the temperature of a pressure-bearing heat-transfer medium in the pressure chamber is reduced circularly in the cold bath circulating slot; an inverted U-shaped copper tube and a temperature sensor are arranged in the inner cavity of a hollow cylinder sample, and three temperature sensors are distributed at the upper, middle and lower positions of the outer wall of the sample; the middle temperature sensor feeds back the temperature data to a cold bath controller while monitoring the temperature change of the middle position, and the upper and lower temperature sensors monitor the temperature fluctuation of the corresponding positions; the pressure chamber is equipped with the upper and lower cooling plates to reduce the heat exchange of the pressure-bearing heat-transfer medium in the inner cavity of the pressure chamber with the outside world, and the temperature of the pressure chamber is adjusted by the cold bath movement in the cooling plates. A frozen soil hollow cylinder apparatus pressure chamber temperature control device of the present invention enables the sample to be cooled rapidly, guarantees the uniform and constant temperature of the sample during the whole test period, is not influenced by the outside world and indoor temperature change, and provides the technical guarantee for revealing the mechanical property of the frozen soil under the action of the complicated 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 e...

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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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