Earth and rockfill dam slope protection structure and construction method

The invention belongs to the technical field of earth and rockfill dam construction, and particularly relates to an earth and rockfill dam slope protection structure and a construction method. The slope protection structure comprises a dam body with a trapezoidal cross section, a special-shaped concrete protection slope with a trapezoidal cross section and a transition inverted filter material, and the transition inverted filter material is arranged between the dam body and the special-shaped concrete protection slope. According to the construction method, the length b of the lower bottom is calculated according to the length a of the upper bottom, the height c and the downstream side slope ratio n of the special-shaped concrete protection slope and the slope ratio m of a preset dam slope, the special-shaped concrete protection slope is cast in situ at the preset position according to the calculation result, the dam body is filled, and the transition inverted filter material is filled between the special-shap