In-situ experimental studies on improvement of deformability of rock masses by grout treatment

摘要

The grout treatment is to inject cement milk from the borehole at the dam foundation in order to improve the mechanical properties and permeability of the rock masses. The effect of improvement about the mechanical properties are gained by cement's being fulfilled to the joints, and as a result, it can be made rock masses "hard", "homogenized", and "unified". However, at the dam sites in Japan, the effect by grouting has been verified only from the permeability tests outcome, and there are not enough examinations about the mechanical properties. Therefore, regardless of many construction results such as the consolidation grouting, the rise of mechanical properties by grouting is not considered in the dam foundation design in Japan.