Well gradedsoil will has the larger dry density after sedimentation ?
级配较好的土，沉积后的干密度较大；
2
It has just begun to study the mechanism and design method of broadly gradedsoil filter.
多级配砾石土反滤层工作机理及设计方法的研究，国内外均刚开始。
3
The model of wave propagation in functionally graded material (FGM) is introduced to soil medium, and the concept of functionally gradedsoil medium is brought forward.