Analysis of the deformation of ground materials using digital image correlation method

Details of research

Material deformation is closely related to the damage and failure that occur within it. By capturing the detailed deformation behavior, we can understand the processes and mechanisms of damage and failure, which enables prediction and prevention of destruction. Typically, material deformation is measured by attaching instruments such as strain gauges to the material’s surface. However, while this method allows for accurate measurement, it faces challenges such as difficulty in installation and limitations under special conditions like high temperatures, where measurements may not be feasible.

In our laboratory, we are using a non-contact method called Digital Image Correlation (DIC) to study the deformation behavior of ground materials under harsh conditions. Specifically, we measure the deformation of coal during combustion and gasification processes using DIC, aiming to clarify the deformation behavior of coal at high temperatures and the conditions under which cracks form within the coal. The results from this research are expected to contribute to the enhancement of efficiency and safety evaluations for underground coal gasification (UCG) that produces blue hydrogen from deep coal seams. In the future, we plan to apply this method to measure the deformation of rock structures such as tunnels and rock slopes.