| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a foam shield method capable of coping with high water pressure by improving water cutoff performance, by forming foam mixed soil of a low water permeability coefficient, and also holding an unsaturated state of this foam mixed soil for a long time as much as possible.SOLUTION: A foam shield method forms a foam mixed soil by injecting a foam into sediment of a working face and sediment in a chamber of a shield machine, by generating the foam by foaming a foaming material aqueous solution formed by further mixing an anion surface active agent by solubilizing a hydrophobic film agent by a water soluble solvent, in the magnification ratio of the expansion ratio of 10 times-50 times.</p> |
