High-pressure soil freezing temperature test device

Abstract

The invention relates to a high-pressure soil freezing temperature test device which is structurally characterized in that a temperature-controlled cabinet is connected with an external cold bath; in the temperature-controlled cabinet, a red copper barrel is inserted to a stainless steel barrel to form double layers of barrels between which cooling medium is held; the red copper barrel is internally provided with a heat insulation layer, a sealing ring, a temperature sensor, an upper pressure head, a soil body and a lower pressure head, wherein the sealing ring is embedded into the heat insulation layer arranged between the upper pressure head and the lower pressure head, an outlet hole is arranged in the middle of the upper pressure head, and a lead of the temperature sensor inserted to the soil body is connected with a data acquisition instrument after penetrating through the outlet hole; the lower pressure head at the lower part of the red copper barrel is provided with a permeable stone and a piece of filter paper, the lower part of the lower part of the lower pressure head is provided with draining air holes, a testing machine dowel bar is in contact with the upper pressure head in the red copper barrel, and the lower pressure head is in contact with a base. The high-pressure soil freezing temperature test device can be used for simply, rapidly and accurately testing the freezing temperature of the soil under the action of high pressure. Meanwhile, by using the device, the soil freezing and melting process can be monitored in real time, and reliable technical assurance is provided for further knowing about the high-pressure soil freezing characteristic and researching the soil freezing and melting process under the action of high pressure.

Description

technical field [0001] The invention relates to a device for testing the freezing temperature of deep soil during the indoor deep soil physical property research process. With this device, the measurement of the freezing temperature of the soil under high pressure and the real-time monitoring of the temperature change process of the soil during the freezing process can be realized. Background technique [0002] The freezing temperature of the soil is the highest temperature or the initial freezing temperature at which the pore water in the soil freezes. The freezing temperature is not only affected by many internal factors such as soil particle size, mineral composition, and water content, but also by external pressure. Therefore, the freezing temperature is a comprehensive judgment index reflecting the formation of porous ice when the temperature drops below zero under the action of various comprehensive factors, and it is an important criterion for distinguishing frozen s...

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Problems solved by technology

Professor Cui Guangxin has used a resistance freezing point instrument to study the freezing temperature of soil, but because the maximum working pressure of the freezing point instrument is not too high, and the freezing process of fine-grained wet soil (such as clay) is relatively long, the resistance change rate is low. Due to limitations such as difficulty in determining the freezing point, it has not been widely promoted

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