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Numerical analysis of hard rock blasting unloading effects in high in situ stress fields

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Abstract

Blasting in high in situ stress fields is different from blasting at the earth’s surface because of the dynamic unloading effect in the former. In order to study the coupling of dynamic loading and dynamic unloading in the blasting process, the explicit finite element method and explicit-implicit finite element method are employed respectively to investigate the influence of high stress on blasting effects. The results show that the stress and strain change rules of the two methods are clearly different. The stress and strain change rates calculated by the explicit-implicit algorithm simulation are greater than the results simulated by the explicit finite algorithm. The radius of the blasting cavity calculated by the explicit-implicit finite element method is 0.015 m larger than that of the explicit finite element method. Based on the results of the explicit finite element method, a theoretical model is also established, which helps to clarify the effects of high in situ stress unloading when blasting in a high in situ stress field. The model shows that the maximum tensile radial displacement caused by high in situ stress dynamic unloading at the edge of the blasting cavity is 0.12 mm, and the dynamic unloading radial tensile effect can lead to rock failure. This research illustrates that high stress has a considerable influence on the blasting process and on rock-breaking effects. According to the findings, certain blasting engineering design suggestions are made.

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Acknowledgments

First of all, the authors give sincere acknowledgement to CAS Pioneer Hundred Talents Program for the completion of this research. The research presented in this paper was also jointly supported by the National Natural Science Foundation of China (Grant No. 41502334) and the 973 Program of China (Grant No. 51278397). The authors wish to acknowledge these financial contributions and convey their appreciation of these organizations for supporting this basic research.

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Author notes

  1. Si-You Xiao and Li-Jun Su contribute equally to this paper.

Authors and Affiliations

  1. Key Laboratory of Mountain Hazards and Land Surface Processes, CAS, Chengdu, 610041, China

    Si-You Xiao, Li-Jun Su & Yuan-Jun Jiang

  2. School of Resources and Safety Engineering, Central South University, Changsha, Hunan, 410083, China

    Si-You Xiao & Zhi-Xiang Liu

  3. University of Chinese Academy of Sciences, Beijing, 100049, China

    Si-You Xiao, Li-Jun Su & Yuan-Jun Jiang

  4. Institute of Mountain Hazards and Environment, CAS, Chengdu, 610041, China

    Li-Jun Su & Yuan-Jun Jiang

Authors
  1. Si-You Xiao
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  2. Li-Jun Su
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  3. Yuan-Jun Jiang
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  4. Zhi-Xiang Liu
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Correspondence to Yuan-Jun Jiang.

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Xiao, SY., Su, LJ., Jiang, YJ. et al. Numerical analysis of hard rock blasting unloading effects in high in situ stress fields. Bull Eng Geol Environ 78, 867–875 (2019). https://doi.org/10.1007/s10064-017-1067-7

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  • DOI: https://doi.org/10.1007/s10064-017-1067-7

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