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<p>This work addresses the stability challenges posed by high steps in an exemplary open-pit mine in China through an in-depth analysis of its engineering geological characteristics and potential failure mechanisms. It identifies a tension-shear failure mode characterized by tensile cracks serving as the trailing tensile fracture surface. Given the notable advantages of polyurethane materials in grouting reinforcement and the lack of their application in reinforcing high-bench slopes in open-pit coal mines, this research focuses on developing a high-performance polyurethane grouting material. Systematic experiments and analyses were conducted to determine optimal component parameters, yielding a bonding strength of 6.9 MPa, shear strength of 7.2 MPa, compressive strength of 35.6 MPa, and tensile strength of 30.3 MPa under optimal process conditions. Additionally, this study revealed that ambient temperature significantly affects material performance, with gel and curing times substantially increasing as temperatures decrease. Optimized experiments were performed using compounded catalysts and initiators to expedite the reaction rate in low-temperature environments. Results showed that adding 0.4 wt.% compounded catalyst and 0.1 wt.% initiator reduced the gel time to 9'32" at –20°C, enabling rapid curing in such conditions. This research offers an innovative technical solution for stabilizing the high-step slopes of an exemplary open-pit mine and broadening the application scope of polyurethane materials.</p>

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Optimized Polyurethane Grouting for Low-Temperature Slope Stabilization in Open-Pit Coal Mines

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • M. Wang,
  • Y. Yao,
  • M. J. Li,
  • W. Dong

摘要

This work addresses the stability challenges posed by high steps in an exemplary open-pit mine in China through an in-depth analysis of its engineering geological characteristics and potential failure mechanisms. It identifies a tension-shear failure mode characterized by tensile cracks serving as the trailing tensile fracture surface. Given the notable advantages of polyurethane materials in grouting reinforcement and the lack of their application in reinforcing high-bench slopes in open-pit coal mines, this research focuses on developing a high-performance polyurethane grouting material. Systematic experiments and analyses were conducted to determine optimal component parameters, yielding a bonding strength of 6.9 MPa, shear strength of 7.2 MPa, compressive strength of 35.6 MPa, and tensile strength of 30.3 MPa under optimal process conditions. Additionally, this study revealed that ambient temperature significantly affects material performance, with gel and curing times substantially increasing as temperatures decrease. Optimized experiments were performed using compounded catalysts and initiators to expedite the reaction rate in low-temperature environments. Results showed that adding 0.4 wt.% compounded catalyst and 0.1 wt.% initiator reduced the gel time to 9'32" at –20°C, enabling rapid curing in such conditions. This research offers an innovative technical solution for stabilizing the high-step slopes of an exemplary open-pit mine and broadening the application scope of polyurethane materials.