FIELD: construction.
SUBSTANCE: method is based upon estimation of distribution of cement solution along perimeter, which cement solution is pumped in inside reinforced concrete lining of tunnel of subway, for example. Acoustic pulses are irradiated and parameters of their propagation are registered by means of radiator and receiver, mounted onto tunnel lining; receiver and irradiator are acoustically connected with body of lining. Results are subject to interpretation on base of empiric dependence, which relates average thickness of cement behind tunnel lining to acoustic signal decay decrement.
EFFECT: improved truth of results; reduced labor input.
2 dwg
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