| 摘要 |
PROBLEM TO BE SOLVED: To provide a natural ground stabilizing method for use in a shield tunneling method, for stabilizing the natural ground on the periphery of a shield machine, and also stabilizing the natural ground on the periphery of a lining structure after forming the lining structure by segments. SOLUTION: The natural ground stabilizing method has a filler injecting step in which a filler is preliminarily injected from an injection hole formed in an outer peripheral portion of a main body of the shield machine into a cavity between the main body and an excavated hole 20, to thereby stabilize the natural ground 8 on the periphery of the shield machine main body, and a back-filling material injection step in which a back-filling material 44 is injected from an injection hole formed in the segment 22 to replace the filling material by the back-filling material 44, and stabilizing the natural ground 8 on the periphery of the segment 22. The filler is formed of a hydrophilic resin which is gelatinized upon addition of water to exert a viscosity of 1,000 to 12,000 cP, and ungelatinized upon addition of a dispersing agent. When the filler is injected, the water-added gelatinous filler is injected, whereas when the back-filling material is injected, the dispersing agent is injected from the injection hole formed in the segment 22 before injection of the back-filling material. COPYRIGHT: (C)2006,JPO&NCIPI
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