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周边爆破法能限制破坏开挖的壁面。采用降低开挖边界爆破能强度的方法即可达到上述目的。最普遍使用的方法是预裂法,此法包含在主体爆破孔引爆前形成一条与开挖边界一致的裂缝。这条裂缝起到减弱生产爆破孔产生的爆炸气浪的作用。本文叙述按静态孔压力计算的控制爆破设计理论,其中包括岩石强度参和岩石结构,以及地应力的影响。
Surrounding blasting can limit the damage to the excavation of the wall. This can be achieved by reducing the intensity of the blasting on the excavation boundary. The most commonly used method is the presplitting method, which involves forming a fracture that coincides with the excavation boundary prior to detonation of the main blasthole. This crack played the role of weakening the blast of blast produced in blast holes. This paper describes the design theory of controlled blasting calculated by static pore pressure, including the rock strength involved in rock structure and the influence of in-situ stress.