隧道掘进爆破载荷作用下埋地管道的振动峰值速度预测研究*

为研究隧道掘进爆破过程中地震效应对邻近埋地管道安全性的影响，建立平行于隧道的埋地管道数值模型，将管道视为薄壳圆柱体，定义管道在动载荷作用下的塑性破坏准则,并利用无量纲分析法构建管道表面质点的振动速度关于振动频率与爆破持续时间的数学模型，从而研究埋地管道受震特性。结果表明:隧道掘进爆破作业下成洞侧的管道应力峰值低于非成洞侧的管道应力峰值，爆炸载荷下邻近埋地管道表面最大振动速度位于爆源与管道表面最近点处，在该点两侧45度范围内为管道易受损位置。将预测公式计算所得振速峰值与数值模型提取的振速峰值进行比较，得出二者的平均误差约为17.7 %。

Research on prediction of peak vibration velocity of buried pipeline under blasting load of tunnel excavation

In order to study the influence of seismic effect on the safety of adjacent buried pipelines during the blasting process of tunnel excavation,a numerical model of the buried pipeline parallel to the tunnel was established.The pipeline was treated as a thin-shell cylinder,and the plastic failure criterion of pipeline under the dynamic load was defined.A mathematical model of the vibration speed of surface particle of the pipeline with respect to the vibration frequency and blasting duration was constructed by using the non-dimensional analysis,and the seismic characteristics of buried pipeline were studied.The results showed that during the blasting operation of tunnel excavation,the peak stress of the pipeline on the hole-forming side was lower than that on the non-hole side,and the position with the maximum vibration velocity of adjacent buried pipeline surface under explosion load is located at the nearest point between the explosion source and the pipeline surface,and the vulnerable position of the pipeline is within 45 degrees on both sides of the point.By comparing the vibration velocity peak calculated by the prediction formula with that extracted by the numerical model,the average error between the two is about 17.7%.