孔隙率较高，孔比表面积主要分布于孔径较小的微孔和过渡孔段，孔隙的连通性较差，煤层渗透率极低；
The distribution of pore surface area is mainly in micro and transitional pore; the pore connectivity is poor and the permeability of coal seam is extre…
建立了射孔段套管弹性抗挤性能分析控制一般方程，并采用摄动理论给出了的孔段套管弹性抗挤能力降低系数一般计算公式。
This paper gives the elastic differential equation of collapse of perforated casing, and a general formula for reduction factor of elastic collapsing by perturbation method.
高台段深孔孔内微差爆破技术在我国的首次应用，为中小型石灰石矿山高台段开采提供了切实可行的方法。
Millisecond delay technology of high step and deep hole is the first application in China, it offers a realistic method for high step exploitation of middle and small scale limestone mine.
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