Seepage regime of structures of the Zagorsk pumped-storage station

Conclusions

• 1. The results of observations of seepage of the main structures of the PSS during temporary operation indicate that for the most part their seepage regime corresponds to the design. At the same time the deviations from the design regime noted in the following structures and elements of the PSS persist: considerable seepage uplift pressure under the bases and in the recesses of the retaining walls of the first level in the upper reservoir (left-bank walls up to 0.29 MPa, right-bank walls up to 0.37 MPa); excess heads in drainage systems of the dike of the upper reservoir behind the retaining walls of the first level (on the left side up to 11.9 m and on the right side up to 17.4 m); a continuing increase of the piezometric levels in the pebble lenses in the moraine stratum in the right part of the slope of the penstocks, which since the time of filling the upper reservoir has amounted to 12.5 m.

• 2. As experience has shown, the method of conducting observations, consisting in taking readings from MMIs at certain time intervals, which has proved itself well at ordinary hydro developments, is insufficiently effective for a PSS, since it is impossible to trace the dynamics of seepage processes during brief fillings and drawdowns of the reservoir. An out is seen here in automation of the entire measuring complex, which will enable obtaining the required information in the necessary volume during any time period.