Test method for frozen soil unfrozen-water content based on pressure plate apparatus

A test method and unfrozen water technology, applied in instruments, measuring devices, scientific instruments, etc., can solve the problems of long test time, cumbersome operation, expensive equipment, etc., and achieve the effect of low test cost and improvement of cumbersome procedures.

Inactive Publication Date: 2016-08-31
TIANJIN CHENGJIAN UNIV
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Problems solved by technology

[0007] The above methods for the determination of unfrozen water content in frozen soil have problems such ...

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  • Test method for frozen soil unfrozen-water content based on pressure plate apparatus
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  • Test method for frozen soil unfrozen-water content based on pressure plate apparatus

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Embodiment Construction

[0027] The test method of the unfrozen water content of frozen soil based on the pressure plate instrument of the present invention is described in conjunction with the accompanying drawings.

[0028] The principle of the present invention is: apply pressure p to the soil sample through an air pump, and use the pressure cell 3 to control the change of pressure. Utilize the saturated high air intake value clay plate 5, adopt the axial translation technology to control the matrix suction of the soil sample, keep the pore water pressure at zero, and under the action of the external air pressure p, the frozen soil sample absorbs water or drains water to achieve the suction inside the soil sample Equilibrium, when the amount of water discharged from the frozen soil sample no longer changes, it indicates that the interior of the soil sample has reached an equilibrium state. At the same time, read the displacement m of the frozen soil sample from the measuring tube 7 w , and then ch...

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Abstract

The invention provides a test method for frozen soil unfrozen-water content based on a pressure plate apparatus. The method comprises the steps of: taking a plurality of frozen soil samples according to geotechnical test standards and performing numbering; spreading air-free water on a pressure plate apparatus pottery clay plate surface until no bubble is generated in a pipeline below the pottery clay plate and the pottery clay plate is saturated; putting the frozen soil samples into a pressure plate apparatus sample area, applying a 20kPa gas pressure to the frozen soil samples, and when the inside of the frozen soil samples reaches a suction equilibrium state, reading the water displacement of the frozen soil samples from a burette; repeating the step and applying pressure forces of all levels in order so as to obtain pressure force values and unfrozen-water water displacement data under corresponding pressure force values; calculating the unfrozen-water content of the frozen soil samples under all levels of pressure forces to obtain a soil-water characteristic curve of the frozen soil samples; and taking the water content corresponding to an asymptote as the unfrozen-water content of the frozen soil samples under the temperature condition. The method has the advantages of low test cost, clear principle, simple operation, and visual test result, thus providing a new method for understanding of frozen soil liquid water content and related research of frozen soil engineering.

Description

technical field [0001] The invention mainly relates to the field of rock and soil freezing in civil engineering, and is mainly applied to a test method for the unfrozen water content of frozen soil based on a pressure plate instrument, which is mainly applied to the determination of unfrozen water content in natural frozen soil or artificial frozen soil. Background technique [0002] The freezing method construction has been widely used in urban construction in the world for more than 100 years, and the freezing method construction technology has a history of more than 40 years in my country. In recent years, with the rapid development of social economy, the number of difficult geological conditions rich in water is increasing, and the influence of unfrozen water content is a problem that must be solved in engineering. Unfrozen water content directly affects the stability and safety of artificial frozen soil freezing projects, so the determination of unfrozen water content i...

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Application Information

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IPC IPC(8): G01N5/00
CPCG01N5/00
Inventor 李顺群潘林娜夏锦红桂超王英红王凯周亚东
Owner TIANJIN CHENGJIAN UNIV
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