This paper describes the effects of bottom water cushion on longholeblasting.
本文论述了水垫层在深孔爆破中的作用。
2
The test results indicate that longholeblasting 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?。
3
The principle of increasing gas emission rate by longholeblasting in the crossing hole is discussed. The radius cracked zone in coal seam caused by longholeblasting is calculated.