Effects of earthquake on damage evolution and failure mechanism of key rock pillars in underground engineering

Abstract

Rock pillar is the key supporting component in underground engineering. During an earthquake, the key rock pillar must bear both the seismic load and the load transferred from other damaged pillars. This paper attempts to reveal the influence of the mainshock on damage evolution and failure characteristic of the key rock pillar during aftershocks by cyclic loading test of marble. Four levels of pre-damage stress (i.e., 10, 30, 50 and 70 MPa) in the first cycle were used to simulate the mainshock damage, and then cyclic stress with the same amplitude (namely 10 MPa) was conducted in the subsequent cycles to simulate the aftershock until rock failure. The results indicate that the presence of pre-damage has an obvious weakening effect on the bearing capacity and deformation resistance of rock materials during the aftershock process. Besides, the increase of pre-damage significantly changes the final failure pattern of the key rock pillar, and leads to an increase in the proportion of small-scale rock fragments. This study may contribute to understanding the seismic capacity of the unreinforced rock pillar during mainshock-aftershock seismic sequences and to optimizing the design of the key rock pillar in underground engineering.

Keywords

mainshock damage / damage evolution / failure mechanism / damaged rock / cyclic loading

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