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Strength Model of Surface Backfill in Upward Slicing and Filling Method and Its Application

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Abstract

The surface backfill, serving as the operational platform for continuing mining in upward slicing and filling stopes, is required to possess sufficient strength and thickness. Currently, there are limited model methods for determining the strength and thickness of the surface fill body. By analyzing the mechanical actions on the surface backfill, it is determined that its stability is mainly influenced by the combined effects of normal and tangential uniform loads under full-load conditions of trackless equipment. Assuming a circular contact surface between the tire of the trackless equipment and the surface backfill, and utilizing solutions from elastic mechanics theories such as the Boussinesq and Cerruti solution, the stress and displacement distribution of the surface fill body were obtained. Based on the maximum vertical stress condition, where the surface backfill body undergoes maximum deformation while still in an elastic state, and considering the stress–strain relationship, a model for the strength and thickness of the surface backfill has been established. According to the research findings, the design for the strength and structural parameters of the surface backfill has been developed to meet the full-load operation of the Atlas ST7 scooptram, with a compressive strength of 1.32 MPa and a thickness of 0.5 m. Numerical simulation analysis results indicate that the stress and displacement of the surface backfill align with theoretical analysis results. Practical results from industrial application in the western section of the Dahongshan Copper Mine demonstrate that the designed strength and thickness of the surface backfill meet the operational requirements for trackless equipment, resulting in significant engineering application effects and economic benefits. The research findings hold significant importance for advancing the theory of backfill mining and have high applicability and promotional value for similar mines.

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Funding

This research was supported by Yunnan Fundamental Research Projects (grant NO.202001AU070062). In addition, part of the funds came from Talent Training Fund of Kunming University of Science and Technology (NO. KKZ3202021040).

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Authors and Affiliations

  1. School of Land and Resources Engineering, Kunming University of Science and Technology, Kunming, 650093, Yunnan, China

    Jun Wang, Tian-yu Yang & Deng-pan Qiao

  2. Datun Tin Mine of Yunnan Tin Industry Co., Ltd, Gejiu, 661000, Yunnan, China

    Pei-liang Xu

  3. Liangshan Mining Co., Ltd, Liangshan,, 615141, Sichuan, China

    Xi Zhang

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  1. Jun Wang
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Contributions

Wang Jun carried out the main writing of the article. Yang Tianyu undertook the numerical simulation part of this paper. Qiao Deng-pan provided technical guidance and review for this article. Xu Peiliang provided the industrial test site and materials for this paper. Zhang Xi has sorted out the references and layout of the article.

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Correspondence to Tian-yu Yang.

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Wang, J., Yang, Ty., Qiao, Dp. et al. Strength Model of Surface Backfill in Upward Slicing and Filling Method and Its Application. Mining, Metallurgy & Exploration 41, 997–1011 (2024). https://doi.org/10.1007/s42461-024-00964-w

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