GROUT MATERIAL OF BEDROCK AND GROUTING METHOD

摘要

PURPOSE: To improve workability by using a mixed liquid containing cement, water and water swelling fibers, in which absorption, fiber length and a fiber diameter are specified, as a grout material forming an impervious wall by injection into the cracked section of a bedrock. ;CONSTITUTION: High water-absorbing fibers, in which absorption is decuple or more of their own weight, fiber length is 8-50mm and fiber diameters are 1-50 denier, are used as water swelling fibers. When a first grout material G₁, consisting of a fiber mixed liquid is injected into a foundation rock R, the first grout material G₁, is flowed into opened cracks K. The fluidity of the grout material G₁ is increased because fiber surfaces absorb water and have smoothness at that time, and fibers are deposited in the cracks K at low injection pressure and close the cracks K. When a second grout material G₂ composed of a cement suspension is infected at pressure higher than the grout material G₁ the second grout material G₂ is infiltrated and fixed into the cracks K and fine cracks in the peripheries of the cracks K and consolidated. All materials are mixed desirably, and one-stage execution of works is conducted. Accordingly, fluidity can be controlled easily, the dispersion of an injection liquid can be prevented, and strength can be increased.;COPYRIGHT: (C)1996,JPO