浅埋近距离煤层工作面过煤柱开采强矿压危险性评价及应用

Evaluation and Application of the Risk of Strong Ground Pressure in the Working Face of Shallow Buried Close Distance Coal Seams through Coal pillar Mining

  • 摘要: 浅埋近距离煤层群下煤层开采过上覆遗留煤柱时,易诱发以顶板台阶下沉或压架为特征的强矿压灾害,其危险性定量评价是现场控制的瓶颈难题。以神东矿区为工程背景,采用顶板结构理论分析,层次分析+加权求和法相结合以及模糊综合评价为辅的方法,系统研究了过煤柱强矿压的主控因素与危险性量化方法。基于“煤柱静载源—顶板传载介质—采动响应”力学链模型,辨识出间采比、煤柱与工作面夹角、间隔岩层稳定性等9项关键指标,构建了三级递阶评价体系,并建立了各指标的四级量化分级标准(弱、一般、中等、高危险)。采用层次分析法计算指标合成权重,提出强矿压危险性综合指数R及四级风险等级划分标准。对比了加权求和法与模糊综合评价法的适用性,推荐以加权求和法为主模型。该体系实现了从单一经验判断到多因素定量综合评估的跨越,为过煤柱开采的危险性评价及治理提供了科学依据。

     

    Abstract: When mining the lower coal seam in shallow?buried close?distance coal seams passing through overlying residual coal pillars, strong ground pressure disasters characterized by roof step subsidence or support crushing are frequently induced. Quantitative risk assessment of such disasters remains a bottleneck for on?site control. Taking the Shendong mining area as the engineering background, a combined method integrating roof structure theoretical analysis and analytic hierarchy process (AHP) weighted summation method, supplemented by fuzzy comprehensive evaluation as an auxiliary approach, was employed to systematically investigate the main controlling factors and quantitative risk assessment methodology of strong ground pressure during coal pillar crossing. Based on the mechanical chain model of “coal pillar static load source – overburden load transfer medium – mining response”, nine key indices were identified, including inter?mining ratio, angle between coal pillar and working face, stability of interburden strata, etc. A three?level hierarchical evaluation system was established, and a four?grade quantitative classification standard (weak, general, moderate, high) was developed for each index. The composite weights of indices were calculated by AHP, and a comprehensive risk index R together with a four?level risk classification standard was proposed. The applicability of the weighted summation method and the fuzzy comprehensive evaluation method was compared, and the weighted summation method is recommended as the primary model. This system achieves a leap from single empirical judgment to multi?factor quantitative comprehensive assessment, providing a scientific basis for risk assessment and management of through coal pillar mining.

     

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