Monitoring changes in the stress-strain state of the Sayano-Shushenskoe hydroelectric station dam in the zone of grouting seeping cracks

Conclusions

• 1. The positive results of grouting cracks in concrete of the upstream face of the Sayano-Shushenskoe dam are not limited to suppression of seepage between elevations 344 and 359 m. Substantial compression of concrete of the first column and beyond the limits of this zone at higher and lower elevations was obtained without advance of the cracks into the depths of the dam during injection of the grout under high pressures, which also prevented seepage.

• 2. It is necessary to consider well-founded the requirement of limiting additional opening of cracks during grouting to 1.5 mm.

• 3. When making calculations for estimating the effect of grouting on the SSS of the dam, one should not proceed from the average pressure in the crack being grouted, since its value is difficult to establish. It can tentatively be considered a rigid inserts over the entire front of the crack with a thickness on the upstream face of 1.75–2 mm and converging to 0 in the zone of joint I–II.