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根据瑞雷波传播机理和有限元弹性动力学理论,分别利用ANSYS和LS-DYNA软件实现地下管道瞬态瑞雷波场响应的模拟。提出了截断边界模型的尺寸计算公式,选择雷克子波为模拟震源,提出网格划分方法;采用粘弹性边界条件(ANSYS)或无反射边界条件(LS-DYNA),有效吸收边界反射波。通过一系列数值模拟计算,总结了在不同的管道形状和管径大小工况条件下瑞雷波信号的响应规律,为实际工程中野外采集系统参数的设定和勘探数据的分析提供理论依据和参考,并在工程实例中得到了验证。
According to the Rayleigh wave propagation mechanism and the finite element elastic dynamics theory, the simulation of transient Rayleigh wave field response of underground pipeline was carried out by using ANSYS and LS-DYNA respectively. The size calculation formula of the truncated boundary model is proposed. The latticed wave is selected as the simulated source, and the meshing method is proposed. The viscoelastic boundary conditions (ANSYS) or the non-reflective boundary conditions (LS-DYNA) are used to effectively absorb the boundary reflected waves. Through a series of numerical simulations, the response rules of Rayleigh wave signals under different pipeline shapes and diameter conditions were summarized, which provided the theoretical basis for the setting of the field acquisition system parameters and the exploration data analysis in practical engineering. Reference, and in the project instance has been verified.