Through the theoretical and experimental study on rock breaking by submerged water jetting, taking rock breaking efficiency as goal function, the optimum jetting pressure was acquired to break rock.
本文通过对淹没射流破碎岩石的理论及实验研究，以破岩效率作为目标函数，得到射流破岩的最优压力条件。
It is special important meaning that Deep - hole blasting With bottom Gap Charging is used to protect bottom rock from breaking, to decrease block ratio and to improve blasting efficiency.
深孔爆破孔底空隙装药在有效地保护底板岩层免遭破坏，减少大块率，提高爆破效率等方面均具有重要的意义。
The swirling water jet technique for breaking rock has good efficiency and larger breaking area.
旋转射流破岩的优势在于破碎面积大、效率高。
The main factors that influence the efficiency of rock-breaking are the down-hole rock properties and the rock-breaking tools and methods.
其破岩效率的主要影响因素是井下地层岩石性质、破岩工具和方法。
The main factors that influence the efficiency of rock-breaking are the down-hole rock properties and the rock-breaking tools and methods.
其破岩效率的主要影响因素是井下地层岩石性质、破岩工具和方法。
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