深部巷道底鼓动态水压致裂治理优化研究以红柳煤矿I040205工作面为例

Optimization of dynamic hydraulic fracturing control for floor heave in deep roadwayTaking I040205 working face in Hongliu Coal Mine as an example

  • 摘要:
    目的 为研究不同地质与应力条件下巷道围岩变形的定制化治理方案,以解决国能集团宁夏煤业红柳煤矿I040205工作面回风巷突发强烈底鼓灾害为工程实例(工作面回采期间虽持续采取卸压措施,但卸压效果不佳,相邻巷道出现严重底板隆起灾害),
    方法 采用钻孔水压致裂技术开展顶板卸压研究。揭示相邻工作面采动应力集中、顶板悬臂梁效应为底鼓主因,
    结果 实测表明底鼓严重程度有一定的周期性变化,变形滞后于应力峰值且具有蠕变特性。优化水压致裂参数,建立“钻孔−起坡段”匹配模型,采用动态步距及高压水泵分段压裂。
    结论 研究表明,优化后的压裂方案可有效降低底板应力、减少起底次数,提升巷道稳定性并降低维护成本,为深部巷道变形、底鼓治理提供参考。

     

    Abstract: To investigate customized governance schemes for surrounding rock deformation in roadways under different geological and stress conditions, we take the immediate severe floor heave phenomenon in the return airway of Working Face I040205 in Hongliu Coal Mine, CHN Energy Ningxia Coal Industry, as an example (pressure relief measures were continuously implemented during the working face advancement, but with insignificant effects, and serious floor heave formed in adjacent roadways). The borehole water pressure fracturing technology was adopted to carry out roof pressure relief research. It is revealed that the mining-induced stress concentration in adjacent working faces and the roof cantilever beam effect are the main causes of floor heave. Field measurements show that the severity of floor heave exhibits certain periodic variations, with deformation lagging behind the stress peak and having creep characteristics. The water pressure fracturing parameters were optimized, a "borehole-ramp section" matching model was established, and dynamic spacing arrangement and high-pressure water pump staged fracturing were applied. The research shows that the optimized fracturing scheme can effectively reduce floor stress, decrease the frequency of floor heave, improve roadway stability, and reduce maintenance costs.

     

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