Abstract
Based on the existing classification research of rockburst dynamic disasters, a new rockburst model is introduced. The model specimens with inclusion rock are designed and produced, and the indoor test of inclusion rockburst with or without cementation, different inclusion angles, and prefabricated cracks of different lengths is carried out. The failure process and displacement variation of rock specimens are recorded and measured by the high‐speed camera system and digital image correlation method, and based on this, the characteristics and laws of rockburst are analyzed. The results show that the failure process of inclusion rock can be divided into several periods, such as crushing and extrusion of the cement body, and the cracks in the upper left tip, the lower right tip, the lower left tip, and the upper tip are expanded and broken in different orders. The dynamic ejection failure of the rock fragments occurs when the degree of failure is severe, and the static failure occurs when the degree of failure is weak. The inclusions have cementation, and the better the cementation, the greater the stress loading required in the failure, the greater the energy accumulated, the more severe the failure, and the higher the fractal dimension of the fragments. The larger the angle of the inclusion tip, the greater the stress loading in failure; the greater the change of the u and v displacements, the more the displacement of the inclusions changed; and the more the energy accumulated, the higher the fractal dimension of the fragment. The smaller the crack length, the greater the stress loading in failure, and the more the energy accumulated, the higher the fractal dimension of the fragments in failure. With more number of cracks and the more severe expansion before failure, the failure of rock mass can be transformed from the dynamic to the static.
Highlights
Rockburst is a common rock dynamic failure phenomenon in underground engineering and mining engineering [1,2,3], which is featured by huge sound, air waves, and spontaneous rock stripping and quick rock ejection, bringing casualties, damage of construction equipment, and underground engineering scrap. erefore, the rockburst belongs to a dynamically static geological disaster. e classification of dynamic disasters on rockburst is one of the most fundamental and key scientific issues on rockburst research
Based on the caused sudden instability, failure of coal and rock mass from the stress state, the common geological structure, and mining process characteristics, Jiang et al [6] proposed the rockburst of coal mine can be divided into material instability, slip displacement, and structural instability
Erefore, the inclusion model specimens are designed and processed, considering the angles of the inclusions and prefabricated cracks in rock specimens. e model test is used to simulate the occurrence process and phenomena of inclusion rockburst in rock mass engineering, the digital image correlation method is used to study the deformation field of the surface of inclusion rock, and the high-speed camera is used to obtain the failure law of the surface of the specimens and the fragments in the ejection, which explores the mechanism of inclusion rockburst, triaxial rock test system of State Key Laboratory of Coal Resources and Safe Mining (Figure 2)
Summary
Rockburst is a common rock dynamic failure phenomenon in underground engineering and mining engineering [1,2,3], which is featured by huge sound, air waves, and spontaneous rock stripping and quick rock ejection, bringing casualties, damage of construction equipment, and underground engineering scrap. erefore, the rockburst belongs to a dynamically static geological disaster. e classification of dynamic disasters on rockburst is one of the most fundamental and key scientific issues on rockburst research. Based on the caused sudden instability, failure of coal and rock mass from the stress state, the common geological structure, and mining process characteristics, Jiang et al [6] proposed the rockburst of coal mine can be divided into material instability, slip displacement, and structural instability. E model test is used to simulate the occurrence process and phenomena of inclusion rockburst in rock mass engineering, the digital image correlation method is used to study the deformation field of the surface of inclusion rock, and the high-speed camera is used to obtain the failure law of the surface of the specimens and the fragments in the ejection, which explores the mechanism of inclusion rockburst, triaxial rock test system of State Key Laboratory of Coal Resources and Safe Mining (Figure 2) Erefore, the inclusion model specimens are designed and processed, considering the angles of the inclusions and prefabricated cracks in rock specimens. e model test is used to simulate the occurrence process and phenomena of inclusion rockburst in rock mass engineering, the digital image correlation method is used to study the deformation field of the surface of inclusion rock, and the high-speed camera is used to obtain the failure law of the surface of the specimens and the fragments in the ejection, which explores the mechanism of inclusion rockburst, triaxial rock test system of State Key Laboratory of Coal Resources and Safe Mining (Figure 2)
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