The application provides a composite
retaining wall and a construction method thereof, and the composite
retaining wall comprises a
cantilever module, a gravity module and a drainage
system, the
cantilever module is a fabricated
retaining wall, is assembled by using dense rib prefabricated plates, is embedded at the bottom of a cast-in-place foundation, and the cast-in-place foundation is poured at one time; the gravity module is formed by pouring solidified soil in
layers, is a semi-
rigid body, and is filled between the
cantilever module and a slope surface; the drainage
system comprises a drainage mat and a rigid waterproof board, the drainage mat is laid between the slope surface and the gravity module, the rigid waterproof board is vertically arranged between a slope foot and the cast-in-place foundation, the lower part is located below the bottom elevation of the cast-in-place foundation, and the upper part is located in a solidified soil pouring area. The cantilever module and the gravity module of the retaining wall are mutually engaged to form a space-embedded resistance
system, have good supporting performance, and have the advantages of a cantilever retaining wall, a downward-inclined retaining wall and an upward-inclined retaining wall; and the drainage system has good water interception and drainage functions.