Because of the interformational disturbed belt and the localized deformation-fracture as well as lots of spring water dots on ground surface, there are many stretch cracks in front and middle of the slope, even in the upper part.

Taking example for the deformation and fracture mass at the right bank of a hydroelectric station in Southwest China,the upstream and downstream boundaries,the front and back boundaries of the deformation and fracture mass were determined using geological qualitative analysis of topography,geomorphology features first.