ANNULAR FILL COMPRESSIBLE GROUT MIX FOR USE BEHIND PRE-CAST CONCRETE SEGMENT INSTALLED IN TIME DEPENDENT DEFORMATION TUNNELS

摘要

The present invention provides for a compressible grout mix forfilling an annular gap between a tunnel rock wall surface and atunnel liner of a tunnel in a rock formation subject to timedependent deformation after excavation and a method of fillingthe annular gap between a tunnel rock wall surface and a tunnelliner of a tunnel in a rock formation subject to time dependentdeformation after excavation utilizing the compressible groutmix for resilient absorption of forces in the hardened state ofthe compressible grout mix exerted by the time dependentdeformation of the rock wall surface into the tunnel opening.The method includes:a. providing the compressible grout mix comprising hydraulicbinding agent, bentonite clay, polymer foam particles, water-reducing admixture, water and air,b. placing the compressible grout mix in the annular gapbetween the tunnel wall rock surface and the tunnel liner, andc. allowing the compressible grout mix to set, wherein thecompressible grout mix in the hardened state has a compressibleratio greater than the anticipated time dependent deformation.