煤巷卸压带及其在煤和瓦斯突出危险性预测中的应用

本文应用岩体力学,弹塑性力学等有关知识,探讨了煤巷卸压带对煤和瓦斯突出的作用机理,建立了煤层界面的应力分布状态方程以及煤巷卸压带和地应力,瓦斯压力,煤强度之间的关系式,并分析了煤巷卸压带中煤体稳定性的条件。研究工作表明:煤巷卸压带中的瓦斯压力,煤体透气性值可以作为突出危险性预测指标和防突措施效果检验的敏感指标。最后,利用自行设计的泡沫封孔测压仪对现场进行了突出危险性预测和防突措施效果检验,得到了十分满意的结果。

The Stress Relaxation Zone in Coal Tunneling and Its Application to Forecast of Outburst Danger

On the basis of rock mechanics and elasto-plastic mechanics, this paper discusses the effect of stress relaxation zone on the outburst of coal and gas in coal tunneling. The equation of stress distribution on the interface of coal seams has been set up . The relationship of ground stress, gas pressure and strength of coal body to the stress relaxation zone in coal tunneling respectively has been discussed, and the stability condition of coal body in relaxation zone has been analyzed. The paper shows that the gas presure in relaxation zone and its permeability can be used as the forecast index of outburst danger and the sensitive index for examining the effect of outburst precaution. The author used the foamy fluid sealing instrument to test the gas presure and its permeability in situ for forecasting the outburst danger and examining the effect of its precaution and obtained satisfactory results.