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为了保证房屋安全,对地表和居民楼进行了监测,以便及时调整爆破参数。结合房屋的破坏特点与监测数据进行了分析,研究表明:隧道爆破引起地表和房屋的振动速度和频率存在差异,随着高度变化房屋振动随之减小。对爆破振动的衰减规律和房屋的响应特征进行了总结分析,得出破坏的原因是:微差爆破时间过短,波形有重叠放大现象;自振频率和爆破频率接近,有共振现象;空洞效应放大了振速;房屋年代久远。最后提出了减振的对策,对爆破有较好的控制。
In order to ensure the safety of houses, the surface and residential buildings were monitored in order to adjust blasting parameters in time. Combined with the damage characteristics of houses and the monitoring data, the research shows that the vibration velocity and frequency of surface and houses are different due to tunnel blasting, and the vibration of houses decreases with the height changes. The attenuation law of blasting vibration and the response characteristics of the house are summarized and analyzed. The reasons for the damage are as follows: the time of the microsecond blasting is too short and the waveform has overlapping magnification; the natural frequency is close to that of the blasting; Magnified vibration speed; houses are old. Finally, the countermeasures of vibration reduction are given, and the blasting is better controlled.