炮眼直径 meaning in English

perforation diameter

The plastic hose should have the correct external diameter in relation to the drill hole .
塑料软管的外径应该与炮眼直径相适应。
Since the crater-hole breakage is of great importance, it can be advisable to use a larger drill hole than the others in the raise .
由于漏斗炮眼的爆破效果非常重要，故天井爆破宜采用较大的炮眼直径。
The paper researches the relations between blasting effect and blasting parameters , including diameter of drill , non - coincidence coefficient , hole spacing , hole row - spacing , cartridge diameter , charge per hole , density of line charge , charging structure and detonating manner , and how to adjust the blasting parameters to get the best blasting effect under the given geological condition
本文在重庆市某高速公路合同段进行了现场预裂爆破试验的基础上，研究了炮眼直径、不耦合系数、炮孔间距、炮孔排距、药卷直径、单孔药量和线装药密度、装填结构、起爆方式等爆破参数与爆破效果之间的联系，以及如何在给定的地质条件下调整爆破参数获得最佳的爆破效果。