Zhu Lei, Xu Yunong, Liu Chengyong, Zhou Yuejin, Gu Wenzhe, Zhu Cunli, Liu Zhicheng
China Coal Technology and Engineering Group Xi'an Research Institute Co., Ltd, Xi'an, China.
State Key Laboratory for Geomechanics & Deep Underground Engineering, Xuzhou, China University of Mining & Technology, Xuzhou, China.
PLoS One. 2025 Jul 11;20(7):e0327157. doi: 10.1371/journal.pone.0327157. eCollection 2025.
Gangue backfill mining technology represents a significant advancement in green mining, mitigating mine pressure and rock mass movements, thereby ensuring underground production safety. To investigate the mechanism of pressure reduction and the sensitivity of factors in gangue backfill mining, a mechanical model was first developed. Then, a method for calculating mining pressure in gangue backfill mining was derived based on the stress characteristics. Numerical simulation methods were then employed to analyze the patterns of mining pressure reduction. Finally, sensitivity analysis was performed using range analysis and variance analysis to determine the sensitivity of factors. The results indicate that: (1) The manifestation of mining pressure in gangue backfill mining is influenced by factors such as mining height and backfill collapse ratio; (2) Under the support of coal gangue, the concentrated stress in the coal seam significantly decreases, forming an arched shape according to the mining stages; (3) The range of plastic failure in the coal seam remains relatively stable under gangue backfill mining, with the plastic zone of the roof plate exhibiting a strip-like distribution; (4) Both range analysis and variance analysis revealed that the sensitivity ranking is backfill collapse ratio > mining height > elastic modulus. Variance analysis further confirms that mining height and backfill collapse ratio have significant impacts, while the elastic modulus of coal gangue has a negligible impact. The study analyzed the manifestation law of coal seam pressure under backfill mining and revealed the sensitivity of the main control factors, which can provide theoretical support for the stability control of coal seams under backfill mining.
矸石充填开采技术是绿色开采的一项重大进步，它减轻了矿山压力和岩体移动，从而确保了地下生产安全。为了研究矸石充填开采中的减压机理和因素敏感性，首先建立了一个力学模型。然后，基于应力特征推导了一种计算矸石充填开采中采压的方法。接着采用数值模拟方法分析采压降低的规律。最后，运用极差分析和方差分析进行敏感性分析，以确定各因素的敏感性。结果表明：（1）矸石充填开采中采压的表现受开采高度和充填垮落比等因素影响；（2）在煤矸石的支撑作用下，煤层中的集中应力显著降低，并根据开采阶段形成拱形；（3）矸石充填开采下煤层的塑性破坏范围相对稳定，顶板塑性区呈带状分布；（4）极差分析和方差分析均表明敏感性排序为充填垮落比＞开采高度＞弹性模量。方差分析进一步证实，开采高度和充填垮落比有显著影响，而煤矸石的弹性模量影响可忽略不计。该研究分析了充填开采下煤层压力的表现规律，揭示了主要控制因素的敏感性，可为充填开采下煤层的稳定性控制提供理论支持。
