Layered temperature control soil freezing and thawing cycle test device

Abstract

The invention belongs to the technical field of soil freezing and thawing tests, and relates to a layered temperature-control soil freezing-thawing cycle test device. The test device comprises a testbox, temperature sensors, moisture sensors, temperature displays and moisture displays are arranged in the outer side of the test box, test chambers are formed in the test box, a sealing ring is fixedat the periphery of the inner wall of the test box between the adjacent test chambers, a test cylinder is arranged inside the test box in the inner sides and positioned in the inner sides of the testchambers, jacks are formed in sides of the test box and the test cylinder, a scraping cylinder is arranged in the test cylinder, first lifting rods are fixed to the two sides of the upper end of thetest cylinder respectively, second lifting rods are fixed to the two sides of the upper end of the scraping cylinder respectively, a seal cover is arranged in the upper end of the scraping cylinder, upper, middle and lower positions of the temperature and moisture sensors can be inserted segmentedly by means of the jacks easily and firmly, a soil sample in the test cylinder can be scraped and removed by means of the second lifting rods and the scraping cylinder, and use is simple and convenient.

Description

technical field [0001] The invention belongs to the technical field of soil freeze-thaw tests, in particular to a layered temperature-controlled soil freeze-thaw cycle test device. Background technique [0002] The freezing and thawing of soil is a very complex process, which is accompanied by physical, physicochemical, and mechanical phenomena and sub-processes. The most important ones include water, heat transfer, water phase change, and salt accumulation. According to statistics, the global land area is 70% % of the permafrost exists, of which 14% is permafrost and 56% is seasonal permafrost; my country is the third largest country in the world with permafrost, and permafrost is a soil medium that is extremely sensitive to temperature. Changes in moisture and temperature will cause frost heaving and thawing in seasonal frozen soil, and cause damage to construction projects and road and bridge projects in permafrost areas. According to the use of structures, the existing soi...

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Problems solved by technology

[0002] The freezing and thawing of soil is a very complex process, which is accompanied by physical, physicochemical, and mechanical phenomena and sub-processes. The most important ones include water, heat transfer, water phase change, and salt accumulation. According to statistics, the global land area is 70% % of the permafrost exists, of which 14% is permafrost and 56% is seasonal permafrost; my country is the third largest country in the world with permafrost, and permafrost is a soil medium that is extremely sensitive to temperature. Changes in moisture and temperature will cause frost heaving and thawing in seasonal frozen soil, and cause damage to construction projects and road and bridge projects in permafrost areas. The use of structures, the existing soil freeze-thaw test device has the problem of poor test effect

[0003] At present, a layered temperature-controlled soil freeze-thaw cycle test device authorized on November 28, 2012 in China, with the authorized public number CN202562912U, provides a new solution based on the above problems, and is equipped with a layered temperature-controlled soil The freeze-thaw test box can test the soil freeze-thaw cycle with layered temperature control, and the test effect is better, but the patent also has the following problems in the use process: the internal sealing effect of the layered temperature control soil freeze-thaw test box is poor, The temperature is conserved and uneven; the temperature sensor and the moisture sensor are inconvenient to insert into the soil, and the fixation is not firm; after the test tube contains the soil sample, it needs to be sent in through the soil sample lifting frame, and the structure is complicated; after the test tube contains the soil sample, the internal soil sample is not easy to clear out , affecting the use of the test cylinder

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