PIV (Particle Image Velocimetry) enhanced measurement method for deformation of plane strain soil sample
A technology of plane strain and measurement method, which is applied to the measurement device, using stable tension/pressure to test the strength and strength characteristics of materials, etc., can solve the problem of lack of real soil sample deformation inspection methods, etc., and achieve the effect of improving the intuitive observation method.
Active Publication Date: 2022-03-04
SUZHOU UNIV
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Problems solved by technology
[0005] For this reason, the technical problem to be solved by the present invention is to overcome the lack of testing methods for real soil sample deformation in the prior art
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Embodiment 1
[0048] In this embodiment, the soil sample used is a sandy soil sample, and sand particles dyed red are arranged on the surface of the soil sample, and the size is 60mm (width)*120mm (height)*100mm (length). The size of the grid on the surface of the transparent sample film is 10mm*10mm, and small black dots with a spacing of 2mm are arranged in each grid, and the diameter of the small black dots is 0.5mm. See Figure 5 . The test steps are as follows:
[0049] (1) Put the soil sample wrapped with the sample film into the pressure chamber. The upper and lower surfaces of the soil sample are in contact with the base and the axial loading block respectively, and the front and rear surfaces are restricted by the plexiglass plate to move back and forth. Apply transparent silicone grease between the glass plates to reduce the friction between the sample film and the plexiglass. The left and right sides are in contact with the square flexible water bag. The water pressure in the fl...
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The invention relates to a plane strain soil sample deformation testing device and a PIV (particle image velocimetry) enhanced measurement method, on the basis of a traditional plane strain tester, the device used by the invention adopts a transparent sample film printed with grids and regular tracking points, graduated scales are printed on a front transparent panel and a rear transparent panel, and a small amount of scattered particles on the surface of a soil sample are dyed; obtaining the theoretical displacement and the actual displacement of each non-identification point overlapped with the dyeing particles on the sample membrane through PIV analysis of the sample membrane tracking point and a finite element interpolation shape function method, and comparing the error between the theoretical displacement and the actual displacement of each non-identification point overlapped with the dyeing particles on the sample membrane; and analyzing and evaluating the actual displacement of other non-identification points on the sample membrane. According to the invention, a method for testing the deformation of a real soil sample is added, a method for estimating the deformation of any point is provided, and a method for intuitively observing the deformation of the soil sample in the test process is improved, so that the mechanical properties of the soil sample can be conveniently and timely investigated.
Description
technical field [0001] The invention relates to the technical field of geotechnical stress-strain testing, in particular to a PIV enhanced measurement method for plane strain soil sample deformation. Background technique [0002] The principle of PIV (Particle Image Velocimetry) technology is to use the camera to take multiple shots to record the real-time position of the tracer particles, and determine the velocity or displacement of the particles through correlation calculations. Because this method basically does not affect the original soil properties, it can be used to investigate the deformation of the soil during the test in a non-contact manner, and it is easy to operate and the results are intuitive, so it has been more and more widely used in soil engineering tests. Many problems in geotechnical engineering are deformation problems of plane strain, such as the deformation of foundation soil under long embankments, the deformation of soil mass on the long sides of s...
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Patent Timeline
Login to View More IPC IPC(8): G01N3/08G01N3/02G01N3/06G01B11/16
CPCG01N3/08G01N3/02G01N3/068G01B11/16G01N2203/0003G01N2203/0019G01N2203/0258G01N2203/0298G01N2203/0647G01N2203/0652G01N2203/0682G01N2203/0676
Inventor 江建洪冯建光
Owner SUZHOU UNIV