Experiment shows the rock breaking efficiency of jet flow impact pressure is enhanced.

实验表明，提高了射流冲击压力的破碎岩石效率。

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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。

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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。

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