当量采深在冲击地压预评价领域的应用

    Application of Equivalent Mining Depth in Rock Burst Pre-assessment

    • 摘要: 为研究近年来频繁发生在浅部煤矿的冲击地压灾害,并在类似条件下进行采掘前半定量冲击危险性预评价,通过分析多起小采深条件下冲击地压事故发生现场的地质条件和相关巷道支护措施表明:采空区侧向支承压力、构造应力在待采工作面垂直方向上叠加导致待采工作面应力异常,冲击地压危险性增大。发生事故的工作面采用的支护和安全防护措施,均是按照浅部煤矿要求设计的,没有充分考虑到采掘区域应力场的分布特征。故据此提出当量采深概念,给出估算公式,并认为采掘前应进行半定量冲击地压危险性预评估和按照“当量采深”进行围岩控制设计及相关安全防护措施。

       

      Abstract: To research the rock burst frequently occurred in shallow coal mine, and conduct semi-quantitative risk assessment of rock bust under similar conditions, the analysis of lots of geological conditions and relevant roadway support measures of shallow mining rock bursts spot shows that due to lateral abutment pressure, tectonic stress overlaying on unexploited mining face vertically leads to stress anomaly; the support and safety protection measures are designed in accordance with the requirements for shallow coal mine on spot without fully considering the distribution characteristics of the regional stress field of mining. On this basis, we propose the concept of equivalent mining depth and the estimate formula, what's more, semi-quantitative risk assessment of rock bust should be done before mining and in accordance with the "equivalent mining depth" to conduct surrounding rock control design and relevant safety protection.

       

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