旋挖钻施工对邻近高压燃气管道的动力响应分析

作者：赵耀忠¹,黎伟佳²,褚继龙³,刘梓文²,林雨霏³,周书东²

作者简介：

赵耀忠，硕士，工程师，E⁃ mail: 404653709@ qq. com

作者单位：

1.深圳铁路投资建设集团有限公司，广东深圳 300308;2.东莞市建筑科学研究院有限公司，广东东莞 523820;3.中电建七局南方建设有限公司，广东深圳 518000

摘要：

为分析旋挖钻施工对邻近高压燃气管道的动力响应，以深惠铁路西丽站基坑工程为背景，对现场监测与数值模拟结果进行了对比分析。结果表明：高压燃气管道附近土体各向振动峰值速度与振源距呈负相关，水平向振动速度大于垂直向振动速度，振动频率集中在 0~ 25Hz.采用衰减关系方程对水平向和垂直向振动峰值速度进行拟合，拟合结果具有较高可信度。管道靠近振源一侧的截面峰值振速与峰值 Von⁃Mises 应力最大，远离振源一侧最小，燃气管道振速大于地表振速并存在线性关系。建立管道振动速度预测模型，可应用于工程中判断管道是否处于安全状态。

关键词：基坑；旋挖钻；燃气管道；振动；动力响应；数值模拟；监测

English：

To analyze the dynamic response of rotary drilling construction to adjacent high⁃pressure gaspipelines, based on the foundation excavation project of Xili Station, on⁃site monitoring and numericalsimulation were adopted. The results show that the peak velocity of soil vibration in all directions near thehigh⁃pressure gas pipeline is negatively correlated with the distance between the vibration sources. Thehorizontal vibration velocity is greater than the vertical vibration velocity, and the vibration frequency isconcentrated in the range of 0 ~ 25Hz. The attenuation relationship equation is used to fit the peakvelocities of horizontal and vertical vibrations, and the fitting results have high credibility. The peakvibration velocity and peak Von Mises stress are highest on the side of the pipeline near the vibrationsource, and lowest on the side away from the vibration source. The gas pipeline vibration velocity isgreater than the surface vibration velocity and has a linear relationship. Establishing a pipeline vibrationvelocity prediction model can be applied in engineering to determine whether the pipeline is in a safestate.

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