IDENTIFICATION OF HOLLOW CHAMBERS UNDER THE ANCHORING CONCRETE PLATES FOR THE TOP SLOPES OF THE NOVOSIBIRSK HEPP DAM BY ACOUSTIC NOISE
The ability of the standing waves method to identify defects in the fastenings of water slopes of dams of hydroengineering constructions are demonstrated on the example of the Novosibirsk hepp. The accumulation of amplitude spectra of acoustic noise records allow to determine frequencies of the few first modes of standing compression-stretching waves generated by noise in concrete slabs. A sharp increase in the frequency of the lowest mode of standing waves is an indicator of the appearance of hollows under the slabs or decompression of the base soils.