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Soil body osmotic coefficient measurement method and device based on electroosmosis

A technique of permeability coefficient and measurement device, which is applied in the direction of measurement device, permeability/surface area analysis, suspension and porous material analysis, etc., can solve the problems of inaccurate measurement results, long measurement time of cohesive soil permeability coefficient, etc., and is conducive to popularization , the test is simple and easy, and the effect of reducing costs

Inactive Publication Date: 2010-08-25
TSINGHUA UNIV
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Problems solved by technology

[0008] In order to solve the problems of too long measurement time and inaccurate measurement results of cohesive soil permeability coefficient, the present invention provides a soil permeability coefficient measurement method and corresponding measurement device based on electroosmosis

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  • Soil body osmotic coefficient measurement method and device based on electroosmosis
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  • Soil body osmotic coefficient measurement method and device based on electroosmosis

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Embodiment Construction

[0021] The technical scheme of the present invention is: apply a voltage to both ends of the saturated sample, and the sample quickly forms a reverse hydraulic gradient under the action of electroosmosis, and the hydraulic gradient and the electroosmotic flow quickly reach an equilibrium state, and in this state, the coupled flow k e i e +k h i h =0, where k e and k h are the electro-osmotic coefficient and soil hydraulic permeability coefficient respectively, i e and i h are the electric potential gradient and the hydraulic gradient, respectively. The potential gradient and hydraulic gradient can be calculated by measuring the electric potential and pore water pressure at different positions in the equilibrium state, k e The range of change is small, and can be obtained through literature or conventional electroosmotic tests. After knowing i e i h and k e After that, the soil permeability coefficient k can be calculated according to this equation h . i e and i h ...

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Abstract

The invention relates to soil body osmotic coefficient measurement method and device based on electroosmosis, belonging to the technical field of measurement of soil body osmotic coefficients. The soil body osmotic coefficient measurement method is characterized by comprising the steps of: putting a saturated specimen into a cylindrical container made of insulating materials, sealing one end of the saturated specimen by using a cathode-sealed electrode plate, isolating from a water tank by using an anode permeable electrode plate, injecting water in the water tank, applying a direct current voltage between the cathode electrode plate and the anode electrode plate, rapidly forming a reverse hydraulic gradient of the saturated specimen under the electroosmosis, enabling the hydraulic gradient to be in balance with potential gradient rapidly, measuring the potential gradient ie and the hydraulic gradient ih under the balance state, coupling to obtain keie+khih=o under the balance state because an electroosmosis coefficient ke is known, and computing to obtain the soil body osmotic coefficient kh. The invention can greatly reduce the measurement time of a low-permeability clay electroosmosis coefficient, improves the measurement efficiency and the accuracy of the measurement result, and effectively lowers the cost; and the measurement device has high automatism and simple and easy test operation, and is beneficial to popularization.

Description

technical field [0001] The invention relates to the technical field of measuring the permeability coefficient of soil, and is especially suitable for measuring the permeability coefficient of low-permeability soil. Background technique [0002] Soil has the property of being permeated by liquids such as water, which is called soil permeability, and permeability is one of the main mechanical properties of soil. The permeability of soil is directly related to the economic benefit and safety characteristics of the project. Since the French engineer Darcy obtained Darcy's law through a large number of uniform sand seepage tests more than a hundred years ago, the permeability coefficient of the soil has become a basic parameter to describe the permeability of the soil. [0003] For a long time, the measurement of soil permeability coefficient has basically remained unchanged in principle, and the permeability coefficient is calculated by measuring the amount of water seeping thr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 胡黎明吴伟令吴照群
Owner TSINGHUA UNIV
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