Numerical simulation on the deformation-cracking process of rectangular tunnel surrounding rock under different impact velocities

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (14) : 94-101.

WANG Xuebin1,2，TIAN Feng2，BAI Xueyuan2，GUO Xiang2

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Abstract

Using a continuum-discontunuum method where the Lagrangian element method and deformational discrete element method were combined, deformation-cracking processes of the rectangular tunnel surrounding rock under different impact velocities was modeled numerically. When stresses acting on rock elements satisfy the shear failure criterion, the stress drop in the form of brittleness was considered, in which the confining pressure remains constant. To validate the present method, the deformation-cracking process of a rock specimen in uniaxial compression was modeled numerically. It is found from results of the rectangular tunnel surrounding rock that: 1) at lower impact velocities, load-displacement curves of the surrounding rock exhibit a single peak, while at higher impact velocities they exhibit several peaks; 2) at lower impact velocities, the failure of the surrounding rock is progressive, while it is intermittent at higher impact velocities, which is related to the fact that the previous arch fails during the impact process and a new larger arch is formed; 3) at the same vertical displacement of the surrounding rock, the cracking depth of two sides of the surrounding rock is larger at lower impact velocities than at higher impact velocities, indicating a relatively uniform stress propagation at lower impact velocities. Results (for example, rock blocks in V-shape notches are squeezed into the tunnel) at lower impact velocities are similar to rib spalling of two sides of the surrounding rock, while results (such as ejections of rock blocks) at higher impact velocities are similar to rockbursts.

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tunnel / surrounding rock / cracking / impact velocity / displacement / load / numerical simulation

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WANG Xuebin1,2，TIAN Feng2，BAI Xueyuan2，GUO Xiang2. Numerical simulation on the deformation-cracking process of rectangular tunnel surrounding rock under different impact velocities[J]. Journal of Vibration and Shock, 2020, 39(14): 94-101

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