precracking meaning in English

预裂法
预裂缝
早期纹裂

This paper expounds the relation of side slope ' s stability with all explosion methods , discusses the development and basic principle of presplit blasting energy - focusing cutting , and introduces the course of development and research on precracking explosion by energy - focusing cutting and its application in dayaowan phase project
摘要综述边坡稳定性与各种爆破方法之间的关系，探讨聚能切割预裂爆破的发展与基本原理，并对聚能切割预裂爆破的研制过程及其在大窑湾二期工程中的应用作简单介绍。