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.

Inactive Publication Date: 2010-06-16
TONGJI UNIV
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Problems solved by technology

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 characteristic curve through experiments, and using a mathematical model to fit the soil-water characteristic cu

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

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Embodiment Construction

[0014] In the research project of instability prediction and treatment technology of a high cutting slope of an expressway, the invention has been tested confidentially and provided a reliable test basis for the permeability coefficient of unsaturated soil. The successful implementation of this project has enabled the Practicability and reliability have been fully verified.

[0015] see figure 2 , obviously, different prediction methods can obtain different permeability coefficients of expansive soil, and the predicted value is different from the measured value. The reason for this error is that the prediction method cannot accurately predict the size of the original state expansive soil permeability coefficient .

[0016] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0017] Such as figure 1 As shown, it is a structural schematic diagram of an embodiment of the present invention. The confined...

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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.

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

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Application Information

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IPC IPC(8): G01N15/08G01N1/28
Inventor 叶为民梅正君张亚为陈宝陈永贵
Owner TONGJI UNIV
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