Analysis on damage characteristics and energy dissipation of rock with a single hole under cyclic impact loads

doi:10.16265/j.cnki.issn1003-3033.2020.07.011

Abstract

Abstract: In order to explore influence of external load on multiple perturbations of surrounding rock during tunnel excavation, cyclic impact load tests of rock with a single hole were carried out by using Split Hopkinson Pressure Bar (SHPB) device under different impact loads (0.6, 0.7, 0.8 MPa) and impact methods (impact pressure of Equal-amplitude and Unequal-amplitude). Then, dynamic characteristics, damage characteristics, energy dissipation and failure modes of these rock specimens under impact loads were analyzed. The results show that based on one-dimensional stress wave theory and interface continuity conditions, an improved damage calculation formula is obtained suitable for rock specimen with a vertical hole which affects changing trend of rock stress-strain curves, especially after several shocks. Damage accumulation of granite increases in a power function along with increase of average strain rate, and shows a good regularity with increase of impact loads. Moreover, cumulative specific energy absorption value increases gradually with cyclic impact, and failure mode has undergone transformation from transverse tensile failure to transverse tensile failure -axial splitting failure and axial splitting failure.

Key words: cyclic impact, rock with a single hole, energy dissipation, damage characteristics, equal-amplitude and unequal-amplitude, damage accumulation

CLC Number:

X936

DAI Bing, LUO Xinyao, SHAN Qiwei, CHEN Ying, LIU Yong. Analysis on damage characteristics and energy dissipation of rock with a single hole under cyclic impact loads[J]. China Safety Science Journal, 2020, 30(7): 69-77.

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