Time domain reflection unsaturated permeameter and method for measuring unsaturated permeability coefficient

A technology of time domain reflectometry and permeameter, which is used in the preparation of test samples, permeability/surface area analysis, measurement devices, etc., and can solve problems such as incorrect analysis of engineering problems and misleading engineering practice.
CN101738360AInactive Publication Date: 2010-06-16TONGJI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
TONGJI UNIV
Publication Date
2010-06-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a time domain reflection unsaturated permeameter. The center of a barrel cap (11) is provided with an air outlet (1); the joint of the barrel cap (11) and a barrel wall (8) is sealed by a first rubber ring (2), and the joint of a base (10) and the barrel wall (8) is sealed by a second rubber ring (6); and 5 buried waveguides (3) are arranged at equal intervals in the barrel wall (8), a soil sample in the barrel wall (8) is isolated from the base (10) by porous stones (4), and the positions on the base, corresponding to the porous stones, are respectively provided with a water inlet (7) and a water outlet (5). The invention also provides a method for measuring the unsaturated permeability coefficient of a soil body. The method uses a time domain reflection probe to measure the water content of the soil body in the fixed positions and solves the unsaturated permeability coefficient of the measured medium by making use of the beforehand-measured soil-water characteristic curve of the measured soil body and finally using the instant section method. The invention can be used for measuring the unsaturated permeability coefficient of different soil samples (undisturbed or remolded) and improves the accuracy.
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Description

technical field

[0001] The invention belongs to the field of civil engineering, and in particular relates to a novel geotechnical experimental equipment and an experimental method for geotechnical engineering test research. Background technique

[0002] With the rapid development of civil engineering, agriculture and other related fields, the unsaturated soil permeability coefficient has been paid more and more attention. In the stability of foundation pits and slopes, the analysis of water seepage in soil, the migration of water and substances, and the nuclear waste How to obtain the unsaturated permeability coefficient of soil has become a difficult problem to be solved urgently in engineering construction and related fields. However, in current engineering practice at home and abroad, the method of predicting the unsaturated soil permeability coefficient is mainly adopted, such as determining the unsaturated permeability coefficient of soil samples and the soil-water char...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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