The
permeability structure of rock mass controls the macro-permeability
characteristics of fractured rock mass. However, the geological factors are
complex and diverse. They control the permeability structure of rock mass. As
to the actual engineering rock mass, the rock permeability structures are the
hybrid types that are formed by basic permeable structure types. Through
practical research at the field and statistical analysis, this paper summarizes
five types of basic permeable structures that are widespread and four types of
hybrid permeability structures and percolation characteristics in fractured
rock mass. At last, it is concluded that based on hybrid permeability
structures, the hybrid types of permeable structures are mainly Ⅲ-Ⅳ and Ⅰ-Ⅱ-Ⅲ. Also, the results are more in
line with the actual situations.