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<p>The high-level ground stress squeezing effect and the full development of rock mass joints and fissures are the main causes of floor heave failure in deep roadways. In order to study the asymmetric floor heave failure mechanism of surrounding rocks in deep roadways of the Jinchuan mining area and optimize the support parameters of the steel pile control technology, this paper takes the 610&#xa0;m main ramp as the engineering background. Based on the theory of material mechanics, the deep roadway floor is simplified as a simply supported beam model. The deflection curve equation of the floor beam is solved, and sensitivity analysis is carried out for each parameter. Based on UDEC software, the numerical model of inhomogeneity and discontinuity for surrounding rock in deep roadway is constructed to analyze the deformation and failure mechanisms of surrounding rock under different support conditions, and a new technology for controlling roadway floor heave failure by steel pile is proposed. The results show that the floor heave amount of surrounding rock in deep roadway presents an obvious asymmetric distribution, and the maximum floor heave amount shifts to the area with high abutment pressure on both sides of the roadway. The floor heave deformation of deep roadway exhibits a linear relationship with burial depth and an inverse functional relationship with the elastic modulus of surrounding rock. The horizontal ground stress shows an exponential growth relationship with the floor heave deformation of deep roadway. The larger the roadway cross sectional size, the more prone the floor surrounding rock is to flexural deformation, and the growth rate of floor heave deformation decreases. Based on orthogonal tests, the optimal support parameters for steel pile are obtained, and the maximum floor heave amount is reduced by 63% compared with the original support. The steel pile technology can fully enhance the bearing capacity of the surrounding rock, jointly resisting the floor heave deformation of deep roadway. The results provide engineering guidance for the control of floor heave in deep roadway and offer useful references for the design of support parameters under similar conditions.</p>

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Study on the asymmetric floor heave failure mechanism of deep roadway and control technology with steel pile

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Diyuan Li,
  • Hao Gong,
  • Wenkai Ru,
  • Pingkuang Luo

摘要

The high-level ground stress squeezing effect and the full development of rock mass joints and fissures are the main causes of floor heave failure in deep roadways. In order to study the asymmetric floor heave failure mechanism of surrounding rocks in deep roadways of the Jinchuan mining area and optimize the support parameters of the steel pile control technology, this paper takes the 610 m main ramp as the engineering background. Based on the theory of material mechanics, the deep roadway floor is simplified as a simply supported beam model. The deflection curve equation of the floor beam is solved, and sensitivity analysis is carried out for each parameter. Based on UDEC software, the numerical model of inhomogeneity and discontinuity for surrounding rock in deep roadway is constructed to analyze the deformation and failure mechanisms of surrounding rock under different support conditions, and a new technology for controlling roadway floor heave failure by steel pile is proposed. The results show that the floor heave amount of surrounding rock in deep roadway presents an obvious asymmetric distribution, and the maximum floor heave amount shifts to the area with high abutment pressure on both sides of the roadway. The floor heave deformation of deep roadway exhibits a linear relationship with burial depth and an inverse functional relationship with the elastic modulus of surrounding rock. The horizontal ground stress shows an exponential growth relationship with the floor heave deformation of deep roadway. The larger the roadway cross sectional size, the more prone the floor surrounding rock is to flexural deformation, and the growth rate of floor heave deformation decreases. Based on orthogonal tests, the optimal support parameters for steel pile are obtained, and the maximum floor heave amount is reduced by 63% compared with the original support. The steel pile technology can fully enhance the bearing capacity of the surrounding rock, jointly resisting the floor heave deformation of deep roadway. The results provide engineering guidance for the control of floor heave in deep roadway and offer useful references for the design of support parameters under similar conditions.