论文部分内容阅读
在作者给出层状饱和场地三维精确动力刚度矩阵和层状饱和半空间中移动荷载动力格林函数基础上,采用间接边界元方法在频域内求解了层状流体饱和场地中沉积谷地对斜入射平面P1波的三维散射问题。该方法的特点在于虚拟移动均布荷载和斜线孔隙水压可以直接施加在沉积与层状饱和半空间交界面而不存在奇异性。该文通过与已有结果的比较验证了方法的正确性,并以均匀饱和半空间和弹性基岩上单一饱和土层中沉积谷地为例进行了数值计算分析。研究表明,沉积谷地对平面P1波的三维散射与二维散射之间存在本质差别,入射角度、孔隙率、饱和土层刚度和饱和土层厚度等参数对沉积谷地附近动力响应有着显著影响。
Based on the three-dimensional dynamic stiffness matrix and the dynamic Green’s function of moving load in layered saturated half-space, the author uses the indirect boundary element method to solve the problem that the sedimentary valleys in the saturated fluid-saturated bed and the oblique incident plane P1 Three-dimensional wave scattering problem. The characteristic of this method is that the virtual moving uniform load and diagonal pore pressure can be directly applied to the interface between the sedimentary and the layered saturated half-space without singularity. In this paper, the correctness of the method is verified by comparison with the existing results. The numerical calculation and analysis are carried out by taking the saturated semi-space and the valleys in a single saturated soil layer on elastic bedrock as an example. The results show that there is an essential difference between the three-dimensional scattering and the two-dimensional scattering of plane P1 wave in the sedimentary valleys. The parameters such as incident angle, porosity, saturated soil layer thickness and saturated soil layer thickness have significant effects on the dynamic response near the depositional valleys.