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<p>The impact of roof collapse can induce severe vibrations and floor failure, potentially triggering a chain reaction of disasters in the goaf and compromising mine safety. Understanding the response characteristics of the floor under roof collapse impact is critical to preventing such disasters. Based on the disturbance behavior of roof collapse on the floor, a mechanical response model for the floor was established. The response functions of the floor including displacement, velocity, and stress were derived. The reliability of the theoretical calculations was evaluated using the linear correlation coefficient and Root Mean Square Error. The response characteristics of the floor under various factors and their sensitivities were analyzed using mathematical statistics methods. The failure mode criterions for the floor were proposed based on elementary failure criteria, and the response characteristics and failure modes of the floor under different collapse locations were revealed. The results show that the restraint effect at both ends of the floor is positively correlated with the collapse ratio (<i>a</i><sub>2 </sub>− <i>a</i><sub>1</sub>)/<i>L</i>, collapse thickness <i>h</i><sub>0</sub>, and goaf height <i>H</i>, while it is negatively correlated with the thickness-to-span ratio <i>h</i>/<i>L</i> and collapse position (<i>a</i><sub>2</sub> + <i>a</i><sub>1</sub>)/2. The sensitivity of tensile stress to various factors is higher than that of velocity. The disturbance response of the floor is primarily influenced by the thickness-to-span ratio, followed by the collapse ratio and collapse thickness, and least affected by the goaf height. Additionally, tensile failure occurs before punching shear failure, with punching shear failure always accompanying tensile failure. Moreover, the restraint effect of the boundary conditions on the disturbance response of the floor intensifies as the collapse location approaches the mid-span, causing displacements and velocities to increase while tensile stress decreases. The study methodology provides a novel thinking for multi-factor sensitivity analysis, while the findings provide theoretical support for ensuring safe production in the open stopping method.</p>

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Failure Modes and Sensitivity Analysis of Floor Structures Under Roof Collapse Impacts in Goafs

  • 期刊论文

  • 发表日期：

    2025年5月15日

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  • Jinzhu Li,
  • Lichun Jiang,
  • Yu Xiong

摘要

The impact of roof collapse can induce severe vibrations and floor failure, potentially triggering a chain reaction of disasters in the goaf and compromising mine safety. Understanding the response characteristics of the floor under roof collapse impact is critical to preventing such disasters. Based on the disturbance behavior of roof collapse on the floor, a mechanical response model for the floor was established. The response functions of the floor including displacement, velocity, and stress were derived. The reliability of the theoretical calculations was evaluated using the linear correlation coefficient and Root Mean Square Error. The response characteristics of the floor under various factors and their sensitivities were analyzed using mathematical statistics methods. The failure mode criterions for the floor were proposed based on elementary failure criteria, and the response characteristics and failure modes of the floor under different collapse locations were revealed. The results show that the restraint effect at both ends of the floor is positively correlated with the collapse ratio (a2 − a1)/L, collapse thickness h0, and goaf height H, while it is negatively correlated with the thickness-to-span ratio h/L and collapse position (a2 + a1)/2. The sensitivity of tensile stress to various factors is higher than that of velocity. The disturbance response of the floor is primarily influenced by the thickness-to-span ratio, followed by the collapse ratio and collapse thickness, and least affected by the goaf height. Additionally, tensile failure occurs before punching shear failure, with punching shear failure always accompanying tensile failure. Moreover, the restraint effect of the boundary conditions on the disturbance response of the floor intensifies as the collapse location approaches the mid-span, causing displacements and velocities to increase while tensile stress decreases. The study methodology provides a novel thinking for multi-factor sensitivity analysis, while the findings provide theoretical support for ensuring safe production in the open stopping method.