大型高架桥梁爆破拆除塌落触地对地面振动影响分析  

Influence Analysis of Demolition Touchdown by Collapsing Blasting on Ground Vibration with Large City Viaduct

作　　者：李明 

机构地区：[1]中交第二航务工程局,武汉430040

出　　处：《路基工程》2016年第2期175-178,共4页Subgrade Engineering

摘　　要：针对某城市大型高架桥爆破拆除工程,采用动力有限元法计算了桥梁塌落触地引起的振动响应,并从幅值、频谱成分及衰减特性等方面探讨了振动的传播规律。计算结果表明：塌落触地振动随着距离的增加而衰减显著;竖向振动响应明显大于径向振动;塌落触地振动的振动能量主要分布在0~50 Hz频率范围内,且随着距离的增加,低频成分逐渐占主导地位。Focusing on a large viaduct blasting demolition project in a city,the dynamic finite element method was adopted to calculate the vibration response caused by collapsing touchdown. The propagation law of vibration was discussed from aspects like vibration amplitude,frequency spectrum and attenuation. The calculation results showed that the vibration caused by collapsing touchdown will be attenuated rapidly with the increase of distance; the vibration responses in vertical direction are larger than the radial vibration significantly; the vibration energy of vibration caused by collapsing touchment is mainly distributed between the frequency scope of 0 Hz and 50 Hz,and the low frequency component will be dominated with the increase of distance gradually.

关 键 词：爆破拆除 塌落触地振动 传播规律 动力有限元 低频 

分 类 号：P633.2[天文地球—地质矿产勘探]