【摘要】 减震沟是降低爆破地震效应的重要措施。利用DYNA中自带的炸药模型,模拟了不同情况下减震沟的减震效果。通过数值模拟,比较了有无减震沟时的峰值震速分布和开挖面与减震沟距离变化时质点的峰值震速衰减规律,分析了不同深度、不同宽度减震沟的减震效果的减震效果。结果表明;开挖面距离减震沟越近,减震效果越好;在保护区侧,减震沟附近,由于减震沟的屏蔽作用,存在一个震速很小的区域;减震沟的减震效果随减震沟深度的增加而增加,而减震沟的宽度变化对减震意义不大。更多还原

【Abstract】 Vibration-isolating effect of vibration-isolating slot is simulated in different conditions by an explosive model in DYNA.Based on the numerical simulation,peak particle velocities(PPVs) are compared between two cases with a vibration-isolating slot and without vibration-isolating slot;the attenuation law of PPV is analyzed for different distances between blasting points and damping ditches.Vibration-isolating effect is compared and analyzed for different depths and different widths of vibration-isolating slot.The result indicates that: the closer to vibration-isolating slot excavation face is,the better the vibration-isolating effect is;On the side of protection zone,there is a zone near the vibration-isolating slot that its vibration velocity is little because of the shield effect of vibration-isolating slot;vibration-isolating effect increases with the increase of depth of vibration-isolating slot,but the width of vibration-isolating slot hardly change the vibrationisolating effect.更多还原