Experimental study on visualization test method of whole process shearing of model rock joints

Visualization test of whole shear process is of great significance to study progressive failure characteristics of rock joints. The study combines three-dimensional laser scanning，printing technology with transparent photosensitive resin material(veroclear) to produce high-precision transparent models of rock joints. Carry out uniaxial compression experiments at different temperatures，the experimental results show that the performance of this material is similar to that of rock material at －30 ℃–－45 ℃. Local modification of shearing equipment based on semiconductor refrigeration technology，The refrigeration performance tests under different working conditions show that after 50 minutes of operation，the cooling performance of semiconductor refrigeration equipment is gradually reduced by forced convection，and the temperature inside the cavity is maintained at about －17 ℃. Combined with the dark channel prior defogging algorithm and the visual monitoring method，the surface morphology of the whole shear process of the rock joints surface can be obtained more clearly，which effectively solves the problem of specimen fogging low temperature test conditions. The shear test shows that the temperature of the sample is always lower than －30 ℃ in the whole process of the test at low temperature，which meets the temperature requirements of photosensitive resin material as rock-like characteristics. The feasibility of the test equipment and test technology is further verified，which creates conditions for a visual test method for the whole shear process of rock joints. © 2022 Academia Sinica. All rights reserved.