Axis translation based synchronous measurement method for unsaturated soil permeability coefficients and soil-water characteristic curves
A technology of soil-water characteristic curve and permeability coefficient, which is applied in the research field of unsaturated soil-water characteristics in geotechnical engineering, can solve the problem that the research cannot be carried out, the permeability coefficient of unsaturated soil cannot be measured, and the research progress of unsaturated soil permeability is affected and other issues to achieve the effect of improving innovation, improving efficiency and ensuring accuracy
Active Publication Date: 2019-09-20
HUBEI UNIV OF TECH
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However, the instrument can only be used for soil-water characteristic curve measurement at present, and cannot be directly used for unsaturated soil permeability coefficient measurement
Unsaturated soil researchers need to purchase very expensive special unsaturated permeability coefficient measuring instruments to study the unsaturated soil permeability coefficient. In the case of insufficient research funds, relevant research cannot be carried out, which greatly affects the permeability of unsaturated soil. research progress
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[0052] The invention proposes a method for synchronously measuring the unsaturated soil permeability coefficient and the soil-water characteristic curve based on axis translation. The method simultaneously measures the soil-water characteristic curve and the unsaturated soil permeability coefficient through a pressure plate instrument. This method uses Darcy's law as the basic formula, similar to the principle of constant water head experiment, and calculates the constant water head difference in constant water head experiment with constant air pressure (matrix suction), which is theoretically feasible. On the other hand, by controlling the diameter of the sample, the present invention allows water to pass through the soil sample in a unit time less than the seepage amount of the clay plate, which effectively achieves the control of the water overflow equilibrium time by the soil sample. These provide theoretical basis and experimental support for the present invention. Based ...
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The invention relates to an axis translation based synchronous measurement method for unsaturated soil permeability coefficients and soil-water characteristic curves. The method includes the following steps: 1) preparing a saturated soil sample, and measuring the permeability coefficient of the saturated soil sample; 2) selecting a clay plate, and measuring the saturated permeability coefficient of the clay plate; 3) determining the cross-sectional area of the saturated soil sample according to the proportional relation between the permeability coefficient of the saturated soil sample and the permeability coefficient of the clay plate; and putting the clay plate with the minimum air inlet value and the saturated soil sample into a pressure plate instrument, applying different matric suction less than the air inlet value of the clay plate, measuring the mass of overflowing water and balance time, and calculating the permeability coefficient of an unsaturated soil sample under the different matric suction; and 5) drawing a horizontal axis to be matric suction and a vertical axis to be the relation map of the permeability coefficient of the unsaturated soil sample. The determination of the permeability coefficient of unsaturated soil can be achieved, and the method has important meanings on studying the other respects of the unsaturated soil.
Description
technical field [0001] The invention belongs to the field of research on soil-water characteristics of unsaturated soil in geotechnical engineering, and relates to a method for synchronously measuring the permeability coefficient and soil-water characteristic curve of unsaturated soil, in particular to a method for measuring the permeability coefficient and soil-water characteristic curve of unsaturated soil based on axis translation. Synchronous measurement method for characteristic curves. Background technique [0002] Unsaturated soils are ubiquitous in nature, and unsaturated soils are also closely related to various projects. Therefore, understanding the properties of unsaturated soils is of great significance to both engineering practice and the study of nature. The permeability coefficient of unsaturated soil is an important property of unsaturated soil, and the measurement of unsaturated soil permeability coefficient is usually divided into direct method and indirect...
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Login to View More IPC IPC(8): G01N15/08G01N15/00
CPCG01N15/00G01N15/0826
Inventor 陶高梁李奕吴巍罗晨晨李梓月赵蔚雷达匡航
Owner HUBEI UNIV OF TECH