Self-repairing capsule for landfill liner and method for preventing leakage

A self-repairing capsule for landfill liner, comprising:

• a capsule shell (1), which contains a foaming reaction chamber (11) inside and a plurality of through-holes connected to the foaming reaction chamber (11);
• a foam-generating assembly (2), capable of generating a foaming material in the foaming reaction chamber (11), wherein the foam-generating assembly (2) comprises a plurality of grouting strips (21) disposed closely together, wherein the grouting strips (21) are made of water-soluble films, and wherein different grouting strips (21) comprise different foaming liquids, wherein the foaming liquids do not contain water;
• a water vapor barrier layer (3), which is attached to the capsule shell (1) and covers the plurality of through-holes;
• and
• an adhesive component (4), which is placed on a part of the capsule shell (1) outside the plurality of through-holes, wherein the adhesive component (4) attaches the capsule shell (1) to an impermeable membrane of the landfill liner;
• wherein when the foam-generating assembly (2) is soaked in a leachate of the landfill, different foaming liquids mix to generate the foaming material after the grouting strips (21) dissolve, wherein the foaming material expands through the plurality of through-holes, applies a pressure to push away the water vapor barrier layer (3), and fills void areas of the landfill liner;
• wherein a number of grouting strips (21) is two, one of the two grouting strips (21) is filled with a component A, while another of the grouting strips (21) is filled with component B;
• wherein the two grouting strips (21) spiral and intertwine along the length direction of the capsule shell (1);
• and
• wherein the plurality of through-holes comprises an open hole (12) at both ends of the capsule shell (1) and/or a plurality of pierced holes (13) opened on an outer wall of the capsule shell (1), wherein the pierced holes (13) are evenly placed horizontally in an upper half of the capsule shell (1), while the adhesive component