高压空气冲击煤体增透技术实验研究

Experimental Study on Technology of Permeability Increase by Shocking Coal Body with High-pressure Air

煤层渗透性是矿井瓦斯抽采及瓦斯突出防治的重要参数,而高压空气冲击煤体技术为提高低透气性煤层的渗透性提供了新的思路。该技术与炸药深孔爆破有较大的区别,其免去了较多的潜在危险。对所选取的海州煤矿和艾友煤矿的煤样进行抗压实验和高压气爆实验,记录煤样的物理参数和实验参数,测试计算了高压气体冲击煤体前后煤层渗透率的变化规律,结果表明:气爆后煤样的渗透率总体增大,平均增加了81%以上;高压气体的压力越大,煤样气爆后渗透率的增量越大。根据海州矿10组煤样气爆后渗透率的增量与气爆压力,经回归分析,煤样气爆后渗透率的增量Δk与气爆压力p呈幂函数关系,Δk=2×10-13p11.148。这些规律为高压空气冲击煤体增透技术在现场的实际应用提供了理论依据。

The permeability of coal seam is an important parameter for gas drainage and gas outburst control,and the technology of shocking coal body with high-pressure air provided a new idea for improving the permeability of coal seams with low gas-permeability.This technology is very different from deep-hole blasting by explosives,it can avoid many potential dangers.The compressive experiments and explosion experiments with high-pressure gas were carried out with the coal samples selected from Haizhou and Aiyou coal mines,the physical and experimental parameters of the coal samples were recorded,and the changing regularity of coal sample's permeability was measured and computed before and after shocking the coal body with high-pressure air.The results showed that the coal sample's permeability overall increased after shocking with high-pressure air,an average increase of 81% or more;the higher of the high-pressure air,the larger the increment of coal sample's permeability after shocking.On the basis of the permeability increment and air pressure of ten groups of coal samples selected from Haizhou Coal Mine after shocking and through regressive analysis,the permeability increment Δk of coal samples after shocking and the air pressure p were in a power function relationship,the function relationship between them was expressed as Δk=2×10-13p11.148.All of these regularities provided theoretical basis for site application of the permeability increase technology by shocking coal body with high-pressure air.