long-hole blasting 深孔爆破
long hole blasting raising 深孔爆破法天井掘进
step long-hole blasting 台阶深孔爆破
bunch-long-hole blasting 束状深孔爆破
Moderate-long hole blasting 中深孔爆破
intermediate long hole blasting 中深孔爆破
medium to long hole blasting 中深孔爆破
This paper describes the effects of bottom water cushion on long hole blasting.
本文论述了水垫层在深孔爆破中的作用。
The test results indicate that long hole blasting in the crossing hole can improve the suction quantity of firedamp effectively.
理论研究和试验都表明 ，采用爆破方法可以增加瓦斯?。
The principle of increasing gas emission rate by long hole blasting in the crossing hole is discussed. The radius cracked zone in coal seam caused by long hole blasting is calculated.
简要论述了深孔爆破提高瓦斯抽放的机理，以煤体中柱状装药爆炸后的裂隙圈半径进行了计算。
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