地铁浅埋隧道爆破振动监测及HHT信号分析

Surface Vibration Test and HHT Signal Analysis of Explosion in Subway Shallow Buried Tunnel

  • 摘要: 为解决地铁浅埋隧道掘进过程中爆破振动对地铁施工安全及周围建构筑物的影响.论文以新疆乌鲁木齐市地铁1号线东线隧道中营工-小西沟区间段为工程背景,对地铁隧道掘进爆破时地表产生的振动效应进行了多次监测,得出地表振动速度自掌子面正上方向两边逐渐减小;将爆破产生的振动信号通过HHT方法变换,发现隧道掘进爆破产生的振动信号,其能量主要分布在时间段0~1.2 s,其频率主要分布在频率段0~60 Hz之间.采用掏槽孔分段起爆技术,显著降低爆破振动效应,同时有效控制了隧道爆破施工对周围建构筑物的影响.

     

    Abstract: To eliminate the effect of blasting vibration on subway construction and the surrounding structures in shallow buried tunnel, several vibration monitoring tests were conducted on the Zhongyinggong-Xiaoxigou segment of Xinjiang Urumqi Line 1 subway tunnel surface. The vibration velocity decreases gradually. By HHT transform analysis of blasting vibration signal, it is concluded that the vibration energy generated by blasting is mainly distributed in the time period of 0~1.5 s and low frequency band of 0~50 Hz. Dividing cut holes into several segments can significantly reduce the surface vertical vibration velocity, and it effectively control the impact of the tunnel blasting construction on the surrounding structures.

     

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