论文部分内容阅读
波动数值模拟时,基底直接输入地震波会导致波动能量在计算域内往复反射,影响分析结果的可靠性。应用黏性边界条件模拟无限地基的辐射阻尼效应,基于波动理论及Spring/Dashpots单元实现了ABAQUS软件中黏性边界条件的施加,进而对弹性半空间的波源问题和散射问题进行波动数值模拟,并验证了黏性边界条件的有效性。采用黏性边界和固定边界条件计算响嘡台阵3号测井的土层地震反应,并将计算结果与实际记录进行对比分析。结果表明,固定边界会造成散射波往复反射,放大了地表的地震响应,黏性边界能吸收散射的波动能量,能够较好地模拟土层地震反应。
In wave numerical simulation, the direct input of seismic waves into the substrate will cause the wave energy to be reflected back and forth in the calculation domain, which will affect the reliability of the analysis results. Based on the wave theory and Spring / Dashpots element, the viscous boundary conditions in ABAQUS software are applied, and then the wave source and scattering problems in elastic half-space are numerically simulated. And then, The validity of viscous boundary conditions is verified. The viscous boundary and fixed boundary conditions are used to calculate the seismic response of the soil of No.3 Logging Line in Xiangtan Formation. The calculated results are compared with the actual records. The results show that the fixed boundary can cause the reflection of the scattered wave and enlarge the seismic response of the ground surface. The viscous boundary can absorb the wave energy of scattering and simulate the seismic response of the soil well.