Pile foundation structure and dam foundation structure of deep covering layer containing weak intercalated layer

The utility model discloses a pile foundation structure and a dam foundation structure of a deep covering layer containing a weak intercalated layer, relates to the field of water conservancy and hydropower engineering, and solves the problem that a pile section, penetrating through the weak intercalated layer, of a gravel pile is prone to bulging shear failure. According to the technical scheme, the pile foundation structure of the deep covering layer containing the weak interlayer comprises a gravel pile located in the covering layer, the gravel pile is vertically arranged and is in a columnar shape, at least one layer of weak interlayer is arranged in the covering layer, and an annular reinforcing ring is arranged on the outer side of a pile body, located on the weak interlayer, of the gravel pile. According to the dam foundation structure of the deep covering layer containing the weak intercalated layer, a dam foundation adopts the pile foundation structure of the deep covering layer containing the weak i