Instrument for measuring permeability coefficient of soil body under action of freeze-thaw cycle and use method thereof

Abstract

The invention discloses an instrument for measuring a permeability coefficient of a soil body under an action of freeze-thaw cycle, which comprises a base, wherein a groove facing downwards is arranged on a center of the base, a lower water permeable stone is arranged in the groove, exhaust holes and water inlet holes communicated with a lower part of the lower water permeable stone at a middle lower part of the groove are respectively arranged on two opposite sides of a side surface of the base, a transparent cylinder with an upper opening and a lower opening is arranged in the groove at an upper part of the lower water permeable stone, a cover plate is embedded at the upper opening of the transparent cylinder, an upper water permeable stone is embedded in the cover plate, one side of thecover plate is provided with a drainage hole communicated with the upper part of the upper water permeable stone; two first bolts are symmetrically fixed on the base outside the transparent cylinder,upper ends of the first bolts are higher than the cover plate, the two first bolts are sleeved with a cover plate fixing plate, nuts are arranged on the first bolts on the lower and upper part of thecover plate fixing plate, the center of the cover plate fixing plate is superposed with the center of the cover plate, the center of the cover plate fixing plate is provided with a bolt hole, and a second bolt is screwed in the bolt hole. The invention further discloses a use method thereof.

Description

technical field [0001] The invention relates to a geotechnical engineering technology, in particular to a measuring instrument and a using method for routinely measuring soil permeability coefficient and the change of sample appearance cracks after soil freeze-thaw cycles, as well as CT experiments and SEM special sampling. Background technique [0002] Conventional penetrometers can satisfy the determination of specific soil permeability coefficient, and for some engineering soils in cold regions under the action of freeze-thaw cycles, changes in soil surface appearance (such as the development of cracks), the determination of permeability coefficient after freeze-thaw cycles, and for For some microscopic studies such as CT experiments, sampling of SEM experiments, etc., there are certain deficiencies in conventional permeation instruments: [0003] 1. The appearance of traditional permeation instruments is covered with iron sheets, and the internal sample structure cannot ...

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Problems solved by technology

[0003] 1. The appearance of traditional permeation instruments is covered with iron sheets, and the internal sample structure cannot be effectively observed after the action of permeation water, which is not conducive to SEM sampling of special parts

[0004] 2. Traditional medium-sized penetration instruments cannot be placed in some scanning CT instruments to scan the internal structure of the sample due to size and shape requirements

[0005] 3. Most of the traditional infiltration instruments are fixed in a certain position, which is not easy to disassemble and assemble

The design of the measuring device is good, and the way of thinking is also good. The main advantage is that the seepage path of the soil can be simulated by adding a fluorescent agent into the fluid. However, the instrument is also unable to perform the freeze-thaw cycle test because of the appearance requirements of the structure.

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