DEVELOPMENT OF THE PLASTIC GROUTING MATERIAL WHICH IS FILLED INTO BACK SPACE OF TUNNEL LINING

摘要

There are many void in the natural ground behind lining concrete of aged tunnels. It is necessary that these voids are filled with a back filling grouting material to improve the stability of the tunnels. However, the back filling materials have such undesirable tendencies as run off into natural ground, flow out the face and dilution by water. In order to overcome there weaknesses, a new grouting material and injecting system with it have been developed.