New method for introducing gradient stress into rock-burst prediction

HE Jia-qi; LIN Man-qing; LIU Xi-qi; ZHANG Lan; ZHANG Dian-ji; XIONG Wen; PENG Ya-li

doi:10.11779/CJGE202011015

Volume 42 Issue 11

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Chinese Journal of Geotechnical Engineering > 2020 > 42(11): 2098-2105. > DOI: 10.11779/CJGE202011015

HE Jia-qi, LIN Man-qing, LIU Xi-qi, ZHANG Lan, ZHANG Dian-ji, XIONG Wen, PENG Ya-li. New method for introducing gradient stress into rock-burst prediction[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(11): 2098-2105. DOI: 10.11779/CJGE202011015

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New method for introducing gradient stress into rock-burst prediction

1.
School of Resources of Safety Engineering,Wuhan Institute of Technology, Wuhan 430074, China
2.
School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
3.
Hubei Xing-fa Chemical Group Co., Ltd., Yichang 443711, China

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Received Date: December 24, 2019
Available Online: December 05, 2022

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Abstract

Abstract

During the excavation of underground projects, the tangential stress in the surrounding rock near the cave wall is distributed in a gradient because of the disturbance of excavation unloading in the deep rock mass. In order to explore the effects of gradient stress on rock-burst characteristics, the rock-burst tests under the effects of different gradient stresses on large-sized specimens are conducted with the help of the independently developed rock-burst test simulation device. It is found that there is an obvious correlation between the intensity of rock-burst of rock mass and the gradient stress that it is subjected to. On the basis of considering a large number of engineering examples, the intensity ratio of gradient stress is introduced to optimize the intensity stress ratio criterion so as to establish a prediction method for rock-burst with gradient stress. The results show that there is a clear correlation between the intensity of rock-burst of rock mass and the gradient stress it is subjected to. The criterion considering the gradient stress of the rock-burst overcomes the uneven problem of the traditional intensity-stress ratio index, and the prediction accuracy is raised to 90.4%, which provides a theoretical basis for the prediction of rock-burst of underground projects.
- gradient stress,
- rock-burst prediction,
- intensity,
- intensity ratio

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References (23)

References

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