为分析城市立交桥爆破拆除时结构构件塌落造成的地面振动的特征，介绍了某城市典型立交桥的爆破拆除中地面振动的测量方法，并基于观测点实测数据对地面振动的加速度峰值、频率和持时进行了分析。分析结果表明：塌落造成的竖向地振动幅值比水平分量大，但是其随着距离增大迅速衰减，因此在距离塌落处较近的区域应该考虑竖向地振动的影响；桥梁结构多次连续塌落会导致出现地面振动的叠加，采取减隔振措施可以降低加速度峰值，同时也会使得加速度的峰值频率降低、持时增加；爆破和塌落振动并未对保留桥梁结构造成损伤，说明爆破拆除是一种安全、高效的拆除方法。

To analyze the ground vibration caused by blasting demolition of urban overpass, in this paper we introduced the measurement method and then studied the characteristics of recorded ground vibrations. Through analysis of peak acceleration, peak frequency and duration, results indicate that, the vertical component of vibration is the most important in the region close to the collapse point; the collapse of bridge segments will lead to superposition of ground vibration, and isolation measures can reduce the peak acceleration but increase the duration of vibration; blasting and collapse vibration cause no damage to the reserved structure which indicates that blasting description is a safe and effective method.