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Experimental and numerical investigation on rock breaking of conical pick assisted by abrasive water jet gridding pre-cutting method

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Abstract

In the excavation of rock tunnels, conical picks face lots of problems, such as insufficient rock breaking capacity, low rock breaking efficiency and high wear rate. In order to solve these problems, a new rock breaking method is put forward to combine conical pick with abrasive water jet gridding kerfs (AWJGK). The effects of kerf depth cut by abrasive water jet (AWJ), grid geometry size and pick arrangement on rock breaking performance are studied by orthogonal experiment. Meanwhile, numerical simulations based on finite element method (FEM) model are carried out to study the performance of conical pick and obtain the optimum operating parameters The results show that the average rock breaking volume increases by 322.81%, the average pick equivalent stress decreases by 19.83%, and the maximum pick equivalent stress decreases by 31.65% on average. Moreover, optimal parameters are obtained under certain conditions that can provide a reference for practical application.

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Acknowledgements

The authors would like to acknowledge the financial support provided by Natural Science Foundation of Jiangsu Province (Grant No: BK20200657), Key projects of the Joint Fund of the National Natural Science Foundation of China (U21A20107), National Natural Science Foundation of China (Grant No: 52104150) and Hebei Natural Science Foundation Ecological Wisdom Mine Joint Fund Project (Grant No: E2020402075).

Funding

This work was supported by Natural Science Foundation of Jiangsu Province (GrantNo:BK20200657), Key projects of the Joint Fund of the National Natural Science Foundation of China (U21A20107), National Natural Science Foundation of China (Grant No: 52104150), and Hebei Natural Science Foundation Ecological Wisdom Mine Joint Fund Project (Grant No: E2020402075).

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Authors and Affiliations

  1. School of Mines, China University of Mining and Technology, Xuzhou, 221116, China

    Xin Zhou, Chuwen Guo, Yingchong Liu, Jianbiao Bai & Fengchao Wang

  2. Xu Hai College of China University of Mining and Technology, Xuzhou, 221008, China

    Hui Zhang

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  1. Xin Zhou
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  2. Chuwen Guo
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  3. Hui Zhang
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  4. Yingchong Liu
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  6. Fengchao Wang
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by X.Z., C.G., H.Z., Y.L. and F.W. J.B. contributed to the revision of the article. The first draft of the manuscript was written by X.Z. and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Fengchao Wang.

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Technical Editor: Daniel Onofre de Almeida Cruz.

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Zhou, X., Guo, C., Zhang, H. et al. Experimental and numerical investigation on rock breaking of conical pick assisted by abrasive water jet gridding pre-cutting method. J Braz. Soc. Mech. Sci. Eng. 45, 599 (2023). https://doi.org/10.1007/s40430-023-04514-1

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  • DOI: https://doi.org/10.1007/s40430-023-04514-1

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