For quantitative analysis of fracture development and fracture morphology in similar material models during simulated advancement, the conventional approach is to capture fracture evolution images using a digital camera during mining, then describe and express them through manual sketching or digital image processing techniques such as image binarization. Binarization methods can affect image analysis and processing, sometimes losing image details and inaccurately extracting information about fine fracture morphology.
The XTOP3D XTDIC three-dimensional full-field strain measurement system is a non-contact, full-field measurement technology. It acquires speckle images of an object under different loads and then uses a correlation-matching algorithm for image analysis to quantitatively extract full-field displacement and strain response information. This technology is used for full-field displacement and deformation measurement and quantitative analysis of fracture development and fracture morphology.
Due to its non-contact, real-time dynamic measurement, and high resolution, DIC is widely used to study the fracture processes of standard rock samples and materials with defects such as pre-existing fractures. DIC technology can be used to study the displacement field of model deformation and extract and analyze model strain field information. It also has significant advantages in fracture detection.
① For similar material models, due to their heterogeneity, rough surface, and size significantly larger than standard rock samples, producing high-quality speckle fields on the model surface is crucial for test accuracy.
② DIC technology can optimize the sub-region size and spacing based on the test requirements for crack monitoring, thereby improving test accuracy and reliability.
③ By quantitatively studying speckle pattern quality and optimizing DIC calculation parameters, a dual-parameter threshold method for sub-region size selection is employed to address the heterogeneity of similar materials and the large, non-uniform deformation of the model.
Through the appropriate setup of the DIC measurement system, speckle pattern generation, and selection of sub-region size and spacing, crack initiation and development can be effectively detected and quantitatively characterized in real-world applications of similar material simulation tests and monitoring. This provides data support for the analysis of crack development and failure morphology in similar simulation tests.
