Freezing device for soil freezing test and method for preparing frozen soil model by using freezing device

Abstract

The invention relates to a freezing device for a soil freezing test and a method for preparing a frozen soil model by using the freezing device; the freezing device comprises a freezer and is characterized by further comprising a freezing plate; an inlet pipe of the freezing plate is communicated with an outlet joint of the freezer through a first connecting pipe; an outlet pipe of the freezing plate is communicated with an inlet joint of the freezer through a second connecting pipe to form a refrigerating loop, and a refrigerant flows in the refrigerating loop to freeze soil making contact with the freezing plate. The method for preparing the frozen soil model comprises the following steps that: a soil tank is prepared, and unfrozen soil is contained in the soil tank; a temperature sensor and a freezing depth meter are arranged in the soil contained in the soil tank; a freezing plate with the same size as the soil tank is prepared; the freezing plate is horizontally placed on the soil tank; and the freezer is used for cooling a refrigerant to a test temperature, and the refrigerant uniformly circulates in the freezing plate, so that a cold field source with uniform and constant temperature is formed, the forming process of natural frozen soil is simulated, and the frozen soil model is manufactured.

Description

technical field [0001] The invention belongs to the field of civil engineering, in particular to the field of geotechnical technology, and relates to a freezing device used for soil freezing tests and a method for preparing frozen soil models using the same. Background technique [0002] Frozen soils are widely distributed in China. Permafrost and seasonal frozen soils account for 21.5% and 53.5% of the country's land area respectively. Changing the homogeneous site into a double-layer foundation or multi-layer foundation changes the dynamic characteristics and excellent cycle of the foundation soil, thus directly affecting the stability and safety of the seismic performance of the superstructure. In addition, the frost heaving and pulling damage of soil is also one of the main forms of structural frost heaving damage in seasonally frozen soil areas, which has a great impact on the ecological environment and structural safety. However, domestic and foreign studies on the im...

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Problems solved by technology

[0003] In recent years, indoor permafrost experiments have been carried out, and constant temperature boxes are often used to make models related to permafrost, that is, the thawed soil model is placed in the constant temperature box, which will cause the soil to freeze evenly from the surrounding to the center, which does not meet the requirements of the freezing front of the soil. The actual freezing law that gradually moves downward makes it impossible to carry out experiments on frozen soil with a certain freezing depth

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