If the geometry is too big, you mesh will be less accurate with the same density of mesh(coarse, medium or else). If the geometry is too small, the size effect will be shown here.
You may try to use the same level of the mesh(medium), and see what's the geometry is best for your project. You can see the converge of the deformation.
引用第16楼felixd于2007-11-11 15:34发表的 :
请教mano版主,“模型大小的问题所致”?。模型大小怎么确定的啊,过大了总比过小了好吧,比如我只要看道路中间的沉降,坡脚的隆起变形?