(1Dept. of Min.，China University of Min. and Tech.， Xuzhou 221008 China) (2Mining Technology Institute，Taiyuan University of Technology， Taiyuan 030024 China) (3Institute of Rock and Soil Mechanics，The Chinese Academy of Sciences， Wuhan 430071 China)
Abstract：On the basis of fractal observation and research results for fracture strike grouping distribution，a scale transformation expression of rock mass anisotropy is presented for linear density of fracture and permeability. And a vital conclusion is put forward：that is，the unsymmetry of scale transformation of rock mass anisotropy is proved by numerical and analytical analyses. Only under very few conditions with a single group fracture or the fractal dimensions equal for all of group fractures，there is an invariable of scale transformation of rock mass anisotropy. This natural law will help us to study rockmass mechanics of anisotropy and macro or micro- mechanics.
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2002, Vol. 21 
