Abstract
Disasters of deep underground caverns often occur during excavation or operation stage, which is closely related to the growth and evolution of surrounding rock cracks. The understanding of spatial distribution of internal cracks in rock mass is the key to reveal its deformation and failure mechanism. The transparent resin material with prefabricated crack was used to simulate the initial crack inside the rock, and the uniaxial compression experiment of transparent rock material under complete stress‐strain path was carried out by using the rock mechanical rigidity testing machine. Four high‐speed cameras were arranged around it to record the images of the same moment from different angles. Based on the theory of stereoscopic vision, a calculation method for the three‐dimensional constitutive structure of crack propagation inside the rock was proposed, which can quantitatively describe the crack spatial morphological change. Therefore, the calculation method provides a reliable theoretical support for the surrounding rock reinforcement of underground engineering.
Highlights
In the deep underground caverns, disasters such as roofing and rib spalling often occur during the excavation process, and bolt-shotcrete support is a commonly used reinforcement method, which is not well targeted
It belongs to the space problem in practical project. e research on the spatial distribution and evolution of the rock crack is crucial to the stability of underground cavern when stress environment changes. erefore, it is of great theoretical significance and engineering application value to study the internal cracking mode and evolution mechanism of rock
Erefore, a 3D crack reconstruction method using visible light stereo vision is proposed in this article, which is based on simulating the 3D crack propagation in a rock
Summary
In the deep underground caverns, disasters such as roofing and rib spalling often occur during the excavation process, and bolt-shotcrete support is a commonly used reinforcement method, which is not well targeted. As it is almost impossible to create cracks in a complete real rock, most of the current studies usually use rock-like materials, such as silica glass, poly(methyl methacrylate) (PMMA), ceramics, resins, gypsum powder, and cement, to simulate the crack propagation in rocks. Due to the opacity of real rocks, the 3D fracture and propagation of internal cracks cannot be observed by the naked eye or ordinary optical instruments. E experiments for 3D crack propagation in some transparent materials, such as glass and resin, can only be observed by the naked eye or recorded by using cameras. Erefore, a 3D crack reconstruction method using visible light stereo vision is proposed in this article, which is based on simulating the 3D crack propagation in a rock. Transparent resin materials were used to simulate real rocks, and the 3D expansion of internal cracks was observed using visible light. Provided that the frame rate of the camera is fast enough, real-time recording without unloading can be achieved
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