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Osmotic coefficient investigating method and instrument

A measurement method and technology of permeability coefficient, applied in the direction of permeability/surface area analysis, instruments, measuring devices, etc., can solve the problems of inaccurate measurement, low test efficiency, and inability to measure, and achieve the effect of wide application range and high test efficiency

Inactive Publication Date: 2006-09-13
CENT SOUTH UNIV
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Problems solved by technology

[0003] In order to solve the problem that the existing permeability coefficient tester is used to measure cohesive soil, especially high plastic clay with extremely poor permeability, the test efficiency is extremely low or even impossible to measure, or the test is so inaccurate that it cannot reflect To solve the problem of the permeability of the soil sample in a vacuum state, the present invention provides a method for measuring the permeability coefficient and its measuring instrument using the pressure difference generated by the vacuum as the permeability of the penetration force

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  • Osmotic coefficient investigating method and instrument

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Embodiment Construction

[0008] The specific embodiments of the present invention will be described in detail below with reference to the drawings.

[0009] As shown in the drawings, the present invention includes a base 1, a water inlet and an exhaust port are arranged on the base 1, a lower permeable stone 2 is placed in the middle of the base 1, a gasket 4 and a ring knife 5 are placed between the sheath 3 and the base 1. Cut the soil sample and place it in the soil sample chamber 6, put the guide ring 7 on the ring knife 5, and place the upper permeable stone 8 on the soil sample in the guide ring 7, and the lower end of the force transmission ring 9 is pressed on the permeable stone 8, and the upper end is on top The piston 11, the diameter of the piston is 31 mm to 150 mm, the piston cylinder 10 sits on the guide ring 7, the piston cylinder 10 (with an inner diameter of 32 mm to 151 mm) and the guide ring 7 pad a gasket 12, the piston The cylinder 10 and the base 1 are connected by bolts 13 to compr...

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Abstract

A method for determining osmotic coefficient includes using a vacuuming device to make soil sample be state of vacuum negative pressure and using pressure difference generated by vacuum as osmotic force when osmose is occurred, making water flow in soil sample to create vadose, measuring vadose amount and vadose time as well as vadose distance on soil sample for obtaining osmotic coefficient of tested soil sample. The device for realizing said method is also disclosed.

Description

Technical field [0001] The invention relates to a geotechnical testing instrument and a testing method thereof, and is particularly suitable for testing the permeability coefficient of extremely low permeability foundation soil and foundation soil under different consolidation conditions. Background technique [0002] According to different soil quality, different methods are used to test the permeability coefficient of soil samples. For example, sandy soil uses Kaminsky tube (soil sample tube method) and 70-type tester method (kiem-type infiltration meter); cohesive soil uses South 55-type Permeameter, when it encounters highly plastic clay with very poor permeability, it needs a very high water head, otherwise it will take a long time, or even seepage is not observed. The other is the loaded infiltration method. This method is to use the air pressure generated by the air compressor to apply different infiltration pressures on the soil sample according to the permeability of the...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N7/10E02D33/00
Inventor 王星华王曰国黄勤灿雷鸣夏力农汤国章江亦元巢万里
Owner CENT SOUTH UNIV
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