Abstract
It is well known that cement absorption in dam foundation grouting is strongly influenced by injection pressure. The higher injection pressure results in the larger grout take. But if a higher pressure than a reasonable one is applied, a harmful heave or up-lift will occur. Therefore, it is prerequisite to determine a rational injection pressure.
The major purpose of this paper is to propose a guiding principle of rational determination of injection pressure in dam foundation grouting, which is related to in-situ stress measured by hydraulic fracturing technique. Hence, a hydraulic fracturing procedure newly-devised by the author for in-situ stress measurement at shallow depth is also introduced.
