岩石压缩实验 - 新拓三维技术（深圳）有限公司

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Uniaxial compression measurement of rock and soil

Inspection purpose

Measuring surface displacement field, strain field and crack generation and development trend of cylindrical geotechnical specimens during compression

Inspection scheme overview

The measurement area is 200 mm X 150 mm. Two industrial cameras (2.3 million pixels, 40 frames) are used to capture speckle patterns on the surface of the sample in real time during compression process.Through camera calibration, stereo matching and 3D reconstruction, the 3D coordinates, displacement field and strain field of the object surface are finally obtained.

Inspection process

（1）Preparing speckle pattern on the surface of specimen

（2）Setting up camera position and calibrating camera internal and external parameters

（3）Rock and soil compression, cameras collect data synchronously

（4）Data analysis

Data analysis

（1）Accuracy: Calculating the displacement field of an object in static state, theoretically the displacement of the object is 0, and the actual median displacement has a certain jump, which can be considered as the displacement error of the system

（2）Displacement field: Measure the change of displacement field during the whole compression process of the specimen surface, and display the deformation cloud directly on the image.

（3）Strain field: Measure the change of strain field in the whole process of compression on the specimen surface, and the strain will increase obviously at the crack. The change of crack can be observed by chromatogram. The width of cracks can also be measured by changing

the distance between points.

位移场

应变场

（4）Displacement at different points: Observing the curve of displacement at different points changing with time, the displacement will increase suddenly, and the time of sudden change of displacement in different areas will be different.

（5）Transversal lines displacement distribution: A line is intercepted along the central line, and the deformation information of the points on the line can be observed. The displacement decreases from top to bottom, and there is a sudden change in the displacement at 40mm. First, the connection is not completely aligned. Second, the deformation of the upper and lower is different because the materials are different.