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为了研究起爆时差对孔间裂纹扩展的影响,采用动态焦散线实验的方法,研究含缺陷介质相邻切槽炮孔被采用同时起爆和微差起爆时孔间爆生裂纹的扩展和贯通机制。研究结果表明:(1)在定向断裂控制爆破过程中,其他参数相同时,同时起爆的爆生裂纹成壁质量比微差起爆的质量好。因此,在岩体的定向开挖工程中,可采用同时起爆的方法来提高定向断裂控制爆破的效果。(2)爆炸应力波中的P波前缘压缩波与爆生运动裂纹相互作用降低了爆生运动裂纹的扩展速度和爆生裂纹尖端应力强度因子的值。实验研究结果对于定向断裂控制爆破工程实践具有一定的借鉴意义和参考价值。
In order to study the effect of initiation time difference on the crack propagation between pores, a dynamic caustic experiment was used to study the propagation and penetration mechanism of the intergranular explosion in the adjacent slotted blasting hole with a defect medium when using simultaneous detonation and differential detonation . The results show that: (1) In the controlled blasting of directional fracture, the quality of the simultaneous burst detonation cracked into wall mass is better than that of the differential detonation when the other parameters are the same. Therefore, in the directional excavation of rock mass, simultaneous detonation method can be used to enhance the effect of directional fracture controlled blasting. (2) The interaction between the P-wave front compressional wave and the explosive kinetic crack in the explosive stress wave reduces the propagation velocity of the kinematic crack and the stress intensity factor of the crack tip. The experimental results have certain reference value and reference value for the practice of directional fracture controlled blasting engineering.