中文摘要：

设置在爆破塑性区内的屏蔽沟槽对爆炸应力波具有～定的阻隔效应。为在实验室模拟研究地下爆炸塑性区沟槽对爆炸应力波的屏蔽作用，采用0．125gTNT当量的微型炸药球作为爆炸源，在Фl370mm×1200mm的黄土化爆试验平台上进行沟槽阻隔爆炸应力波的微药量化爆模拟试验。从理论及试验结果分析等方面研究沟槽深度日对爆炸应力波的屏蔽作用。结果表明：（１）塑性区沟槽对爆炸应力波屏蔽效应的力学机制不同于弹性区沟槽；（2）以粒子速度、位移幅值度量的屏蔽系数在沟槽屏蔽区域内存在极大值；（3）塑性区沟槽对爆炸应力波有延迟效应；（4）试验结果定性地验证沟槽屏蔽爆炸应力波的理论分析，两者结论一致。

英文摘要：

The gap in plastic zone has been proved to be one of the most effective techniques for shielding against blasting stress wave. Based on the mini-chemical explosive technique, 0.125 g TNT mini-spherical explosive charges was used as the explosive source for the laboratory researches of the gap shielding against blasting stress wave on the Ф1370 mm×1 200 mm loess samples. The shielding effects of gap on blasting stress wave were studied through the analysis of theory and experimental results. The results show that： （1） The gap in plastic zone is destroyed and the principle of the gap shielding against the blasting stress wave is different fi＇om that in elastic zone. （2） The shielding factors based on the amplitudes of the particle velocities and displacements exist maximum value in the shielding zone of gap. （3） The gap in plastic zone has delay effect for the blasting stress wave. （4） The experimental results qualitatively validate the theoretical analysis of the gap shielding against the blasting stress wave.