Middle anti-seepage liner structure for preventing local sinking in refuse landfill

The utility model discloses a middle anti-seepage liner structure for preventing local sinking in a refuse landfill, which is formed by staggering a compacted soil protective layer, a geogrid reinforced layer, a geocomposite bentonite liner secondary anti-seepage layer and a linear low density polyethylene geomembrane main anti-seepage layer from bottom to top, wherein the compacted soil protective layer leads the stress and deformation of the middle anti-seepage liner material to be uniform, and the geogrid reinforced layer can further reduce the deformation amount, thus effectively reducing the adverse effect of local sinking of an old landfill and improving the safe reliability and durability performance of the middle anti-seepage liner. The structure has excellent anti-seepage effect and local sinking resistant capability and can better realize the anti-seepage function of extending the landfill and the landfill-closing covering function of the old landfill vertically.