高架桥爆破拆除塌落震动的测试与分析  

Monitoring and Analysis of Ground Vibration caused by Explosive Demolition of Elevated Bridge

作　　者：王浩州[1] 严东晋[1] 年鑫哲[1] 孙传怀[2] 张千里[1] 

机构地区：[1]解放军理工大学国防工程学院 [2]96151部队

出　　处：《爆破》2014年第1期144-149,共6页Blasting

摘　　要：为了探究现代城市爆破拆除塌落冲击产生地面震动的传播和衰减规律,对某城市大型高架桥爆破拆除塌落冲击地面振动进行了测试。根据测试数据,得到了地面振动的速度、加速度和主频率等参数,讨论了塌落震动的传播和衰减特点。基于震动衰减理论,对不同距离处的地面振动测试数据进行了计算分析,获得了不同测点处材料的阻尼系数。分析结果表明,在软土地基情况下高架桥的塌落震动主频率为几Hz左右,地面振动的衰减只与材料阻尼系数有关,材料的阻尼系数基本不随低频振动的频率变化,所得衰减规律可以为类似工程提供参考。In order to explore the propagation and attenuation characteristics of ground vibration from collapse in explosive demolition of elevated bridge, the velocity and acceleration on ground surface was monitored. The parame- ters of ground vibration, velocity, acceleration and principal frequency, were obtained based on the measured data, and the propagation and attenuation characteristics of ground vibration were discussed. Based on the wave propagation theory ,the ground vibration at different distance from the elevated bridge were used to calculate the attenuation of amplitude and the material damping coefficients at different test place were obtained. Results showed that the princi- pal frequency of ground vibration induced by the elevated bridge dropped on the soft soil foundation was about several cycles and the material damping coefficient was only concerned with the vibration attenuation and remained almost unchanged at low-frequency.

关 键 词：高架桥 爆破拆除 塌落震动 几何阻尼 材料阻尼 衰减规律 

分 类 号：TU746.5[建筑科学—建筑技术科学]