ABSTRACT
Many high-pressure concrete dams are erected by leaving column cutting joints. After curing of the concrete the cutting joints are filled with cement grout under a certain amount of pressure. After hardening of the grout the dam becomes monolithic.
Before joints grouting hydraulic tests are conducted to determine the joints widening. When grouting the joints, which are separated from the sides of the canyon just by one section of the dam, discharge pressure is passed through this section on the rock massif. By cyclic loading with water pressure, (i.e., using it as a large-scale stamp), and measuring the additional and residual disclosures of the joint, deformation characteristics of the rocky massif in contact with the concrete dam can be determined. Formula for calculating the deformation modulus of the rocks foundation is given in the paper. Such studies, accomplished at the erection of Krasnoyarsk and Chirkej dams (Russia), have shown the ability to not only solve the above-mentioned task, but compact the superficial layer of the rocky massif when a sufficiently large discharge water pressure is applied.
