Study on Plastic Viscosity of Grout Materials and Applicability to Field of Injection Analysis Introducing Filtration Theory

摘要

A bleeding examination and a flow characteristic examination of grout materials were performed to understand a difference of the flow characteristic by the difference in the material mixed grout materials. Moreover, the flow characteristic of grout materials in the voids and applicability to field of injection analysis were examined. The results are as follows:The influence of bleeding becomes the largest during a flow of W+C.In W+C+P+B, the bleeding is controlled by making the connection with a clay particle and the electrolyte generated from cement.W+C+P and W+C of 15 percent or less of volume concentration can be assumed to be Newton fluid. However, W+C+P+B must be taken as Bingham fluid since yield stress changes with volume concentration a lot.The plastic viscosity of the grout materials which flows the inside of the voids follows the theoretical equation which Mon and Ototake (1955) introduced regardless of the kind of grout materials.The injection water and the injection grout materials will be flow in the laminar flow state if there is a proportional relation to the injection pressure, the discharge and Lugeon value.It analyzed about the stage which has the relation shown by the above 5). Consequently, the injection analysis and the field data were well in agreement, and the applicability to the field of this analysis technique was confirmed.