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通过相似材料试验及现场工程测试等手段,对极薄近距离下保护层钻采上覆被保护层垂直应力、膨胀变形、渗透率演化规律进行了研究,得出了钻采极薄下保护层上覆被保护层的垂直应力、膨胀变形及渗透率变化规律等。研究结果表明,钻采极薄近距离下保护层二1煤垂直应力降低60%以上,相对膨胀变形率12‰,相似材料体渗透率增大15倍。钻采一9煤对上覆二1煤能形成保护效果,引起了二1煤卸压增透、卸压增流效应,降低了二1瓦斯抽采难度,消除了二1煤的突出危险性,研究成果可推广应用于极薄保层开采。
By means of similar material test and field engineering test, the vertical stress, deformation and permeability evolution of overburden overburden protective layer at very thin and short distance are studied. The results show that the ultra-thin protective layer Overlying the protected layer of the vertical stress, deformation and permeability changes the law. The results show that the vertical stress of the protective layer 211 decreases by more than 60% while the relative expansion deformation rate is 12 ‰, and the permeability of similar materials increases by 15 times. Drilling a 9 coal on the overlying two 1 coal to form a protective effect, causing two 1 coal pressure relief by penetration, pressure relief effect of the increase, reducing the difficulty of extraction of 1 1 gas, eliminating the prominent risk of 2 1 coal , The research results can be extended to the application of ultra-thin coverings mining.