Landfill slope seepage-proofing structure

The landfill slope anti-seepage structure sequentially comprises a base layer, a cushion layer, an anti-seepage layer, a protective layer and a sandbag layer from bottom to top. The impermeable layer comprises a first HDPE film, a second HDPE film and a water absorption assembly; two welding strips are welded to the lap joint position of the first HDPE film and the second HDPE film, a through groove is defined by the first HDPE film, the second HDPE film and the two welding strips, and the water absorption assembly is arranged in the through groove and contains a reagent capable of detecting moisture. Through the water absorption assembly, after a worker waters a welding position, if a permeation point exists between the first HDPE film and the second HDPE film, water enters the groove along the permeation point and is absorbed by the water absorption assembly, and the absorbed water reacts with a reagent of the water absorption assembly; a worker can check the water absorption phenomenon of the water absorpt