爆破振动作用下高层建筑振速变化规律研究

Variation law of vibration velocity of high-rise buildings under blasting vibration

为了控制露天爆破对城市高层建筑物带来的爆破振动影响,对建筑物进行爆破振动测试及地震数值模拟试验,基于测试与试验结果分析建筑物的三向质点峰值振速,研究爆破作用下高层建筑质点峰值振速的传播规律。研究结果表明:建筑物高度的增加对三向质点峰值振速产生了高程放大效应,其中垂直方向峰值振速放大效应最为明显,放大倍数为2.75~3.8倍;在爆破工程的设计和施工中,高层建筑物振速是否超出标准应根据振动波的垂直方向峰值振速进行判定;质点峰值振速具有明显的传播规律,受单段药量、质点高程、爆心距共同影响;将数值模拟结果与现场测试的结果对比,两者较吻合,采用ANSYS对爆破振动作用下高层建筑的峰值振动速度进行数值模拟研究准确性较高。

In order to control the vibration impact of open-air blasting on urban high-rise buildings,blasting vibration tests and the seismic numerical simulation are carried out on a building.Based on the test and simulation results,the three-dimensional particle peak vibration velocity(PPV)of the building is analyzed,and the PPV propagation law of high-rise buildings under blasting is studied.Important results have been obtained.First,the increase of building height has an amplification effect on the PPV in three dimensions,among which the amplification effect in the vertical direction is the most obvious,magnified 2.75~3.8 times.Second,whether the vibration velocity of a high-rise building exceeds the standards,in the design and construction of blasting engineering,should be determined according to the PPV in the vertical direction of vibration wave.Third,the PPV propagates with apparent regularity,which is affected by single section charge,particle elevation and explosion center distance.Fourth,the numerical simulation results are compared with the field test results,and they are in good agreement.The numerical simulation of PPV of high-rise buildings under blasting vibration by ANSYS is accurate.