Dynamic effects of moving load on a poroelastic soil medium by an approximate method
Dynamic effects of moving load on a poroelastic soil medium by an approximate method
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DOI：
10.1016/j.ijsolstr.2003.11.009
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发表时间：
2004-04
影响因子：
3.6
通讯作者：
D. Theodorakopoulos;A. Chassiakos;D. Beskos
中科院分区：
文献类型：
--
作者：
D. Theodorakopoulos;A. Chassiakos;D. Beskos
本文应用Mei和Foda的理论，在平面应变条件下，研究了移动荷载作用下基岩上饱和多孔弹性土层的动力响应问题。所施加的载荷被认为是傅立叶展开形式的具有变化频率的大量谐波的总和。该方法的解决方案认为，总字段近似的弹性动力学问题与修改后的弹性常数和质量密度的整个域和扩散问题的孔隙流体压力局限于边界层附近的自由表面的介质的叠加。这两个问题都在频域中解析地解决。数值计算了土壤介质的剪切模量、渗透率和孔隙率以及移动荷载的速度对土层动力响应的影响，并与问题的精确解进行了比较。它的结论是，对于细孔弹性材料，本方法的准确性对精确的一个是优秀的。
The problem of the dynamic response of a fully saturated poroelastic soil stratum on bedrock subjected to a moving load is studied by using the theory of Mei and Foda under conditions of plane strain. The applied load is considered to be the sum of a large number of harmonics with varying frequency in the form of a Fourier expansion. The method of solution considers the total field to be approximated by the superposition of an elastodynamic problem with modified elastic constants and mass density for the whole domain and a diffusion problem for the pore fluid pressure confined to a boundary layer near the free surface of the medium. Both problems are solved analytically in the frequency domain. The effects of the shear modulus, permeability and porosity of the soil medium and the velocity of the moving load on the dynamic response of the soil layer are numerically evaluated and compared with those obtained by the exact solution of the problem. It is concluded that for fine poroelastic materials, the accuracy of the present method against the exact one is excellent.