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US 10,647,904 B2Granted
Compressive grout mix for use in absorbing compressive or deformation stresses of subterranean formations
OwnerTony Dimilloinventor
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OwnerTony Dimilloinventor
Estimating the term…
The present invention provides for a compressible grout mix for filling an annular gap between a tunnel rock wall surface and a tunnel liner of a tunnel in a rock formation subject to time dependent deformation after excavation and a method of filling the annular gap between a tunnel rock wall surface and a funnel liner of a tunnel in a rock formation subject to time dependent deformation after excavation utilizing the compressible grout mix for resilient absorption of forces in the hardened state of the compressible grout mix exerted by the time dependent deformation of the rock wall surface into the tunnel opening. The method includes: a. providing a compressible grout mix comprising hydraulic binding agent, bentonite clay, polymer foam particles, water, and one or more additives selected from water-reducing admixture and/or setting retarding admixture, aggregate materials, anti-wash agents and air, b. placing the compressible grout mix in the annular gap between the tunnel wall rock surface and the tunnel liner, and c. allowing the compressible grout mix to set, wherein the compressible grout mix in the hardened state has a compressible ratio greater than the anticipated time dependent deformation.
A compressible grout mix for filling an annular gap between a tunnel rock wall surface and a tunnel liner of a tunnel in a rock formation subject to time dependent deformation after excavation for resilient absorption of forces in the hardened state of the compressible grout mix exerted by the time dependent deformation of the rock wall surface into the tunnel opening, the compressible grout mix comprising at least 10% volume hydraulic binding agent, between 1% and 3% volume bentonite clay, between 30% and 45% volume polymer foam particles, between 40% and 60% volume water and between 0.1% and 19% of one or more additives selected from the group consisting of water-reducing admixture and/or setting retarding admixture, aggregate materials, anti-wash agent and air, wherein the compressible grout mix in the hardened state has a compressible ratio greater than the anticipated time dependent deformation.
A method of filling an annular gap between a tunnel rock wall surface and a tunnel liner of a tunnel in a rock formation subject to time dependent deformation after excavation utilizing a compressible grout mix to be placed in the annular gap between the tunnel rock wall surface and the tunnel liner for resilient absorption of forces in the hardened state of the compressible grout mix exerted by the time dependent deformation of the rock wall surface into the tunnel opening, the method comprising:
Dependencies are inferred from the claim text.