Experimental study on influence of granite grain size on rockburst

SU Guoshao; CHEN Guanyan; HU Xiaochuan; MEI Shiming; HUANG Xiaohua

doi:10.11883/bzycj-2018-0419

Volume 39 Issue 12

Dec. 2019

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SU Guoshao, CHEN Guanyan, HU Xiaochuan, MEI Shiming, HUANG Xiaohua. Experimental study on influence of granite grain size on rockburst[J]. Explosion And Shock Waves, 2019, 39(12): 123103. doi: 10.11883/bzycj-2018-0419

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SU Guoshao, CHEN Guanyan, HU Xiaochuan, MEI Shiming, HUANG Xiaohua. Experimental study on influence of granite grain size on rockburst[J]. Explosion And Shock Waves, 2019, 39(12): 123103. doi: 10.11883/bzycj-2018-0419

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Experimental study on influence of granite grain size on rockburst

doi: 10.11883/bzycj-2018-0419

Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, Guangxi, China

Received Date: 2018-10-29
Rev Recd Date: 2019-06-11
Publish Date: 2019-12-01

Abstract

Abstract

In order to explore the influence of granite grain size on rockburst, cubic granite specimens with an opening and different grain sizes (fine to medium and medium to coarse) were used to conduct the rockburst tests using the true triaxial rockburst testing system. The experimental results show that the failure process of the fine to medium-grained granite is mainly composed of brittle failure. However, rockburst failure (dynamic failure) dominates the failure for the medium to coarse-grained granite. The acoustic emission (AE) activity in the early loading stage is weak for the fine to medium-grained granite, and the low-frequency large-rupture events are concentrated in time and space, and the characteristic stress is higher. However, the AE activity in the early loading stage is stronger for the medium to coarse-grained granite, and the low-frequency, large-rupture events are more discrete in time and space, and the characteristic stress is lower, and the fragments are broken more. The grain size has an important influence on the rockburst proneness of granites. The hard-brittle rock with coarser grain size has a stronger rockburst proneness. In addition to strength and brittleness, grain size is an important factor to be considered in rockburst proneness evaluation of deep underground rock mass engineering.
- rockburst,
- spalling,
- granite,
- grain size

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References

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