基于力能分析的平煤五矿己四采区煤与瓦斯突出危险性预测

Outburst prediction in Ji 4# mining district in Pingdingshan No.5 mine based on force and energy analysis

根据实测平煤五矿己15煤层瓦斯含量和压力结果,从力能角度分析了地应力、瓦斯和煤强度对煤与瓦斯突出的影响,发现己四采区己15煤层受地应力作用,煤体弹性潜能远大于瓦斯膨胀能,即以构造应力为主的地应力为其突出最主要的影响因素;结合己四采区地质因素和己15煤层瓦斯可解吸量,确定该采区煤与瓦斯突出危险区的下限指标为原煤瓦斯含量达到5.4 m3/t,绝对瓦斯压力为0.79 MPa,该下限指标对应的煤层底板标高为–600 m。因此预测–600 m标高以浅为无突出危险区,–600 m以深为突出危险区。

According to the prediction data of gas content and gas pressure of Ji 15# coal seam of Pingdingshan No.5 mine, from the view of force and energy, the influence of ground stress and gas as well as coal strength on coal and gas outburst is analyzed. It is found that under action of ground stress, elastic potential energy is much higher than gas expansion energy in the seam in Ji 4# mining district, i.e., ground stress mainly composed of tectonic stress is the major factor influencing outburst. In combination with the geological factors in the district and gas desorption of the seam, it is determined that the bottom index for coal and gas outburst risk area is gas content 5.4 m3/t in raw coal, or the absolute gas pressure is 0.79 MPa .The bottom index corresponds to the seam floor of elevation -600 m. Therefore the areas above-600 m do not have outburst risk and there exist outburst risk below -600 m. The study results guide effectively the gas control in the coal mine.