Freezing-thawing cycle test device

Abstract

The invention discloses a freezing-thawing cycle test device. The freezing-thawing cycle test device comprises a temperature control chamber and a test specimen box, the test specimen box is arranged in the temperature control chamber, and the temperature control chamber is connected with a heating system and a refrigerating system separately; the heating system and the refrigerating system are in signal connection with a controller separately; a soil specimen is contained in the test specimen box, and the upper end of the test specimen box is closed through a pressure applying piston; the upper surface of the pressure applying piston is fixed to the lower end of a tubular cylinder, the tubular cylinder is filled with hydraulic oil, and the upper end of the tubular cylinder penetrates out of the top surface of the temperature control chamber and is sealed through a hydraulic oil piston; the hydraulic oil piston is connected with a pressure loading mechanism; the controller is in signal connection with a pressure sensor arranged in the hydraulic oil and a temperature sensor arranged in the temperature control chamber separately. According to the freezing-thawing cycle test device, acting force equivalent to building pressure borne by an actual soil body in a natural freezing-thawing cycle can be applied to the soil specimen in a freezing-thawing cycle test, and thus a result obtained in the freezing-thawing cycle test can be objective and accurate as far as possible.

Description

technical field [0001] The invention relates to the field of rock-soil freeze-thaw cycle test in civil engineering, in particular to a freeze-thaw cycle test device. Background technique [0002] Frost heave and thaw settlement are the main problems encountered in engineering construction in cold regions. During the freezing process of the soil, the water in the soil (in-situ water and migrating water) freezes into ice, and forms ice intrusions in the form of ice crystals, ice lenses, and segregated ice layers, which cause relative displacement between soil particles. Frost heave of different degrees will be caused to the soil, and the frost heave can generate huge force, which will cause the displacement of the retaining structure, and the paving, the foundation of the structure, the pipeline, the fence, etc. will be uplifted, twisted or even broken. The melting of frozen soil will cause subsidence, which will cause uneven settlement of structures built on it, roadbed mudd...

AI Technical Summary

Problems solved by technology

Although there are quite a variety of freeze-thaw cycle test devices for soil samples in the field of construction, there are few such devices at present that introduce the pressure exerted by the building on the soil in actual civil engineering into the soil test. In the same cycle freeze-thaw test, it is impossible to objectively reproduce the freeze-thaw state of the soil under the pressure of the building in the natural freeze-thaw cycle, so the test results obtained are also difficult to be objective and accurate.

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