粘弹性边界荷载对走滑断层同震地表变形影响模拟研究

Simulation study of the effect of boundary load on coseismicsurface deformation of strike-slip fault

以我国某次地震为原型,通过搭建走滑断层有限元模型,模拟分析了边界荷载对走滑断层同震地表变形影响。结果表明:摩擦系数为0.6时,走滑断层上剖面节点、中剖面节点、下剖面节点地表变形宽度分别为2419、3590和1279 m;摩擦系数为0.8时对应数据为1177、1790和839 m;走滑断层边界位移量分别为5、7、9、11和13 m时,断层附近位移量分别为0.84、1.20、1.51、1.86和2.19 m。边界荷载的提升会明显增加断层附近的位移量,也会正向影响走滑断层的同震地表变形量。

Based on an earthquake in China,a finite element model of the strike-slip fault was established to simulate and analyze the effect of boundary load on the surface deformation of the strike-slip fault.The results show that when the friction coefficient is 0.6,the surface deformation widths of upper section node,middle section node and lower section node are 2419,3590 and 1279 m respectively,while when the friction coefficient is 0.8,the corresponding data are 1177,1790 and 839 m respectively.When the displacement of the strike-slip fault boundary is 5,7,9,11,13 m,the displacement near the fault is 0.84,1.20,1.51,1.86,2.19 m,respectively.The increase of the boundary load will obviously increase the displacement near the fault.In general,the increase of boundary load will positively affect the coseismic surface deformation of strike-slip fault.