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通过测试到的不耦合装药加载条件下混凝土中产生的径向爆炸波信号分析,识别和分离了信号中的爆炸冲击波、应力波及爆生气体膨胀作用,并就各自作用时间、大小、衰减规律及爆后损伤开展了定量研究。结果表明:在同一测点处同时受到爆炸冲击波、应力波及爆生气体的共同作用,作用时间分别为3.5,3.3和16.6μs;爆炸冲击波表现为压应力,峰值在1000 MPa以上;应力波表现为拉压作用,爆生气体膨胀表现为持续的拉应力或压应力的准静态作用。爆炸冲击波应力峰值随距离呈非线性快速衰减,应力波和爆生气体作用正负应力峰值随距离衰减缓慢,混凝土中爆炸波作用分区与凝聚炸药爆轰结构的压力分布有关。爆后混凝土的损伤实验表明:爆炸除形成了通自由面的7条裂纹外,在炮孔周围形成了半径为12.5 cm的损伤区,且损伤阈值Dcri=0.2,与理论计算一致。
By analyzing the radial blast wave signal generated in the concrete under the uncoupled charge loading condition, the blast shock wave, the stress wave and the expanding gas explosion of the signal were identified and separated. The time, the size and the attenuation law And post-burst damage were studied quantitatively. The results show that at the same measuring point, both the explosion shock wave, the stress wave and the explosive gas act at the same time, with the action time of 3.5, 3.3 and 16.6 μs respectively. The shock wave of the explosion is compressive stress with the peak value above 1000 MPa. Tension and compression, the explosion of gas explosion showed continuous tensile stress or compressive stress quasi-static role. The peak value of shock wave amplitude is nonlinearly decayed with distance. The peak values of positive and negative stress of stress wave and explosive gas flow decay slowly with distance. The partition of explosive wave in concrete is related to the pressure distribution of detonation structure of condensed explosive. The experiment on the damaged concrete after blasting shows that the explosive has a radius of 12.5 cm around the blasthole, and the damage threshold Dcri is equal to 0.2, which is consistent with the theoretical calculation except for the formation of seven cracks through the free surface.