A Miniature Seismic Reflection System for Evaluation of Concrete Linings

The study presented in this paper demonstrates the application of a miniature seismic reflection (MSR) system as a nondestructive testing tool for evaluation of concrete shaft and tunnel linings. First, the principles of the system are described. Then, results obtained from experimental studies on a concrete shaft lining are presented. Various sections of a shaft lining at different elevations are investigated and their elastic properties at each point are calculated. In another field study, the thickness of the tunnel lining is computed using this system. In both cases, the MSR values are in agreement with results obtained by independent laboratory testing of core samples extracted from the linings.