Real-time test method for water content of unsaturated soil triaxial sample
A triaxial sample, real-time testing technology, applied in the direction of material analysis using radiation diffraction, can solve the problems of real-time testing of sample water content, affecting test parameters, and inability to use triaxial testing, and solve problems that cannot be tested in real-time. Effect
Active Publication Date: 2019-03-29
HUNAN UNIV
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Problems solved by technology
At present, the vast majority of TDR probes are in the form of probes, which need to be inserted into the soil. Obviously, this type of probe cannot be used for real-time testing of the water content of samples in triaxial tests, because the probes will have a negative impact on the water content of the sample. The damage caused by the triaxial specimen directly affects the acquisition of its test parameters
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[0035] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited thereby.
[0036] like Figure 1~3 As shown, the TDR probe consists of three parts: the flexible base layer 1, the flexible conductor 2 and the connector 3, wherein the flexible base layer 1 is a polyimide film insulation layer, and the flexible conductor 2 is a long tube made of copper, stainless steel or other metal films. strip conductor. The connector 3 is a radio frequency connector.
[0037] The flexible base layer 1 and the flexible conductor 2 are directly integrated by gluing or immersion gold. The thickness of the strip-shaped conductor is 0.1-0.5 mm, the width is 1-5 mm, and the length is 10-500 mm. There are three flexible conductors 2, which are distributed on the flexible base layer 1 in such a way that both ends are aligned, distributed in parallel, and the distance between them is equal, a...
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Abstract
The invention discloses a method for testing the moisture content of an unsaturated soil triaxial specimen in real time based on a time domain reflection (TDR) technology, which can be used for testing local moisture content of the specimen in an unsaturated soil triaxial test in geotechnical engineering. According to the method, a special flexible probe is horizontally wound and installed on the triaxial specimen (10), located between the triaxial specimen (10) and a rubber membrane (4) and connected with a TDR tester (9) outside a triaxial pressure chamber (7) through a wire (8). The moisture content of an installation part can be tested in the triaxial test process at any time, and thus the problem that the moisture content of the local position cannot be obtained in the unsaturated triaxial test process in geotechnical engineering is solved.
Description
technical field [0001] The invention relates to a real-time testing device and method for soil water content, in particular to a real-time testing probe, testing device and testing method for unsaturated soil triaxial sample water content based on time domain reflection (TDR) technology. Background technique [0002] In geotechnical engineering testing, triaxial test is an important test method to obtain the shear strength of rock and soil. The shear strength of rock and soil is closely related to the degree of consolidation of the triaxial sample, so the acquisition of the water content of the sample has important engineering significance. As far as the current test methods are concerned, the content of the triaxial sample The water content can only be obtained before putting it into the base or after the test, and there is no way to directly determine the water content in the middle of the test, especially in the triaxial test of unsaturated soil, it is possible that the u...
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IPC IPC(8): G01N23/20
CPCG01N23/20
Inventor 陈仁朋罗宏洪鹏云程威鲁立
Owner HUNAN UNIV