Dam-face geomembrane seepage prevention rockfill dam, construction method and defect location method

The invention discloses a dam-face geomembrane seepage prevention rockfill dam, a construction method and a defect location method. The dam-face geomembrane seepage prevention rockfill dam comprises several independent dam sections which are sequentially arranged in the axial direction of a dam body; each independent dam section comprises a buttress, a rockfill body, a seepage prevention body anda defect seepage monitoring system; upstream faces of all the independent dam sections are in an arched shape leaning towards the upstream part, and the upstream dam slope ratio is 1:0.2; each seepageprevention body comprises a geotechnical mat, a composite geomembrane and a cast-in-place concrete protection layer; each defect seepage monitoring system comprises multiple drainage pipe groups andflowmeters. By means of the dam-face geomembrane seepage prevention rockfill dam, two key technical problems which restrict the development of geomembrane seepage prevention rockfill dams are solved;composite geomembrane separa