在有几个高次轴时，轴的组合相当 于正四面体时称为四面体群(Tetrahedral group)，用T 表示；轴的组合相当于正八面体对称时 称为八面体群(Octahedral group)，用O 表示。
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对四面体透水框架群进行了阻力特性的试验，研究了四面体透水框架数量(密度)和水深对阻力的影响。
Resistance characteristics of the tetrahedron-like penetrating frames are carried out by experiments, and the influence of frame quantity (density) and water depth on resistance is studied.
四面体透水框架群是由很多单个四面体框架抛投而成，具有很大的空隙，因而，可以将框架群看成由很多框架杆件和大的孔隙组成的大孔隙率多孔介质。
The revetment is made up of many single permeable tetrahedrons, and has much gap, so the group of permeable tetrahedrons can be treat as the porous media with large porosity.
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