地下管线受爆破振动的监测方案及响应特征研究

Study on monitoring scheme and response characteristics of underground pipeline subjected to blasting vibration

为了确保地下管线的安全运行,本文以北方某城市高速公路隧道下穿钢筋混凝土供水管线为背景,提出管线的爆破振动测试方案并进行测试。通过分析实测数据,探究爆破振动波形特征,研究爆破振动的峰值振速和主频特性,并通过回归分析提出爆破振动速度预测公式。结果表明:隧道爆破施工过程中,虽然掏槽孔药量并非最大,相比辅助眼和周边眼而言,其引起管线的爆破振动响应更为强烈;掏槽孔爆破测点垂直方向的峰值振速最大,该方向主频率主要集中在50~80 Hz区间内,而大多数地下管线的自振频率在4~10 Hz之间,与地下管线之间难以形成共振现象;采用萨道夫斯基公式拟合得到隧道下穿供水管线的爆破振速经验公式,并通过调整爆破参数,实现了隧道安全穿越供水管线。

Based on the reinforced concrete water supply pipeline under a highway tunnel in the north of China,in order to ensure the safe operation of the underground pipeline,the blasting vibration test scheme of the pipeline is proposed and tested.By analyzing the measured data,the waveform characteristics of blasting vibration is explored,the peak vibration velocity and dominant frequency characteristics of blasting vibration are studied,and the prediction formula of blasting vibration velocity is put forward through regression analysis.The results show that the blasting vibration response of the pipeline is stronger than that of the auxiliary hole and the peripheral hole,although the charge amount of the cut hole is not the largest during the tunnel blasting construction;The peak vibration velocity in the vertical direction of the measuring point of cut hole blasting is the largest,and the main frequency in this direction is mainly concentrated in the range of 50~80 Hz,while the natural vibration frequency of most underground pipelines is between 4~10 Hz,which is difficult to form resonance with underground pipelines;The empirical formula of blasting vibration velocity of the tunnel passing through the water supply pipeline is fitted by Sadovsky formula,and the tunnel safely passing through the water supply pipeline is realized by adjusting the blasting parameters.