摘要
文章用动光弹试验方法研究了相邻两个炮孔被同时起爆和采用不同的起爆时差起爆时炮孔之间应力波的传播及其应力波对裂纹扩展的影响,并重点研究了炮孔之间裂纹的产生、扩展及贯穿过程和机理。研究结果表明:在先起爆的炮孔爆炸产生的动态应力场存在时起爆另一个炮孔,即起爆时差N基本满足t/c(?)<N<t/c(?),是在后起爆的炮孔孔壁上产生主导控制裂纹的最有利条件;在先起爆的炮孔旁钻导向孔,并采用合适的起爆时差可以获得炮孔间的最佳贯穿。
The propagation of the stress waves and the influence of the waves on the extension of cracks between two adjacent boreholes initiated simultaneously or deiayedly were investigated with the method of dynamic photoelasticity. The analysed results expressed that the delay-initiation borehole was initiated during the present of the dynamic stress fields generated by the explosion of the former-initiation borehole is the favourable condition of generating guiding cracks on the wall of the delayed borehole. The optimum form of the penetration between boreholes may be realized by means of drilling a guiding-hole near the former-initiation borehole with an available delay time.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
1991年第4期346-352,共7页
Explosion and Shock Waves
基金
国家自然科学基金
关键词
延时起爆
炮孔
裂纹贯穿
动光弹
delayed ignition,borehole,penetration of cracks,dynamic photoelasticity.
