沿空煤柱工作面冲击地压危险性研究

Study on Rock Burst of Coal Pillar Working Face along Goaf

沿空煤柱工作面受采空区影响产生侧向支撑压力,回采时与超前支承压力产生应力叠加形成高应力集中,极易诱发冲击地压。以某矿5302沿空煤柱工作面为背景,提出采用综合指数法与可能性指数诊断法进行宏观评价,确定了冲击地压的类型,并结合数值模拟方法对该工作面进行应力分析。该工作面的冲击危险性指数为0.74,发生冲击地压的可能性指数为0.977,数值模拟显示回采过程中工作面煤壁前方的静态垂直应力约为35 MPa,通过评价该工作面具有中等冲击危险性。根据评价结论,在工作面回采前采取了预卸压措施,工作面实现了安全回采。

Lateral abutment pressure is applied on coal pillar working face influenced by goaf, and mining and abutment pressure generate stress superposition produce high stress concentration, all of which are liability to induce rock burst. Taking a coal pillar working face No. 5302 as an example, the comprehensive index method and the possibility of diagnosis method for macro assessment were proposed, and the type of rock burst was determined, combined with the numerical simulation method of the coal pillar working face stress analysis. The index of rock burst danger of this working face is 0.74, the index of rock burst possibility is 0.977, and the static vertical stress is approximate 35 MPa by numerical simulation when the working face was advancing. The risk of the whole mine working face is medium class of rock burst danger by evaluation. According to the evaluation conclusions, stress relief measure was adopted before mining, and working safety was achieved.