Geotechnical Characteristics and Stability Analysis of Rock-Soil Aggregate Slope at the Gushui Hydropower Station, Southwest China

Table 1

Classification of the toppling failure of plate rock masses.

Type	Dip of rock layer	Geological characteristics	Position
Strong toppling	Angle of toppling rock layer and normal rock layer is larger than 60°.	A clear breakage phenomenon in rock, the continuity of fracture surface is good and extends in a long length, and each surface is distribution of parallel strips in different distances. The crack in fracture zone is mainly opened, no filling of rock block or debris. The phenomenon of shear dislocation is obvious, and several sets of joints are generated by the toppling effect.	(1) Upper part of slope; (2) Upper part of plate rock mass; (3) Horizontal depth is about 50 m.
Weak toppling	Angle of toppling rock layer and normal rock layer is less than 60°.	The strata dip is abnormal, but the breakage phenomenon is not obvious; the distribution of rock mass is multilayer and continuous. Most of them maintain the organization and structure of original rock mass, but the shear strength is decreased in the local region. The crack in fracture zone is partly opened, and there is a filling of calcite crystals or calcarenite.	(1) Lower part of slope; (2) Below the strong toppling rock masses; (3) Horizontal depth is about 100 m.