Deformation-cracking-collapse process of surrounding rock of cavern for different impact amplitudes based on continuous-discontinuous method

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (1) : 233-242.

WANG Xuebin1, TIAN Feng2, QIAN Shuaishuai2

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Abstract

In protection and mining engineering, cavern surrounding rock is often subjected to different forms of impact load to cause serious disasters, such as, collapses and rockbursts.Here,the continuous-discontinuous method developed by ourselves for Lagrange element-deformation body discrete element coupling was continuously improved. At the same time, Type-I and Type-II fracture energy were introduced, on the basis of simulating tensile fracture, they were also suitable for simulating shear fracture, so they were of positive significance to the mechanism analysis and prevention of related disasters. The continuous-discontinuous method was used to perform the numerical simulation of deformation-cracking-collapse process of cavern surrounding rock under periodic half sine wave impact. The mechanism of cavern roof cracking caused by reflection and superposition of stress wave was emphatically studied. The cause of the phenomenon of tensile and shear cracking on both sides of cavern was explained, and the influence law of periodic impact load amplitude was explored.Results showed that (1) when the first compression stress wave reaches cavern roof surface, the middle part of the compression stress wave is reflected, and the reflected tensile stress wave alone or superimposed with the tensile zone between the first and second compression stress waves leads to roof cracking; (2) cavern roof is mainly subjected to tensile cracking, and two sides of cavern are mainly subjected
to shear cracking to form V-shaped pits, the tensile cracking zone of cavern roof can absorb energy of subsequent stress wave; (3) multiple V-shaped pits are formed after shear cracking on both sides of cavern, and the stress in pit is low,moreover, there exists a weakly squeezed zone or even a tensile zone behind compression stress wave to cause tensile cracking in pit and phenomenon of tensile cracking and shear cracking accompanying; (4) with decrease in impact load amplitude, the number and distribution range of tensile and shear cracks decrease, the maximum depth of V-shaped pit decreases, and cavern surrounding rock is easier toreach an equilibrium.

Key words

impact load / cavern surrounding rock / stress wave / reflection / superposition / tensile cracking / shear cracking / continuous-discontinuous method

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WANG Xuebin1, TIAN Feng2, QIAN Shuaishuai2. Deformation-cracking-collapse process of surrounding rock of cavern for different impact amplitudes based on continuous-discontinuous method[J]. Journal of Vibration and Shock, 2021, 40(1): 233-242

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