建筑物下爆破震动放大效应的试验研究

Experimental Study on Amplification Effect of Blasting Vibration under Buildings

结合某隧道爆破震动的大量监测,分析了爆破震动高程放大系数K′与爆心距R和爆心距的水平投影S之比值(R/S)的相关性,现场的监测结果表明爆破震动放大效应系数K′与R/S成正相关,当R/S变化范围在1～5时,K′值增长较快;当R/S大于5时,K′值增长渐缓,最后趋于水平;爆破震动放大效应系数K′并不会随R/S值增大而无限制的增大,同时通过现场的实测对其进行了检验,研究结果对于城市复杂环境下爆破震动效应的预测以及爆破震动放大效应的理论研究有一定的现实意义。

The correlation between K＇（ the amplification effect coefficient of blasting vibration） and ratio R/S（ R is the distance to blasting center,and S is the length of horizontal projection of the distance R） was analyzed based on the large amounts of test data of blasting vibration obtained from some tunnel project. It is found that the K＇value was positively associated with the ratio R/ S. When the ratio R/S varied from 1 to 5 ,the K＇value increased quickly;When the ratio R/S was more than 5, the K＇value increased slowly ,finally leveled off; the K＇value could not increase unrestrainedly with the with the increasing of the ratio R/S. The law of amplification effect of blasting vibration has been verified by actual tested results. The result of the study has some practical significance to the forecast of vibration effect and the theoretical study on amplification effect of vibration for blasting project under complicated condition of city.