Abstract: Based on large-scale test model of the Haihe immersed tube tunnel locating at the centre avenue of Tianjin city, the application study of surface wave survey method, used for detecting filling effect of its underwater pressure casting foundation, was carried out. Considering the frequency characteristic and site environment of the tunnel, the types and qualification of equipments for surface wave survey were selected, setup and arrangement of detectors were optimized, and the equipment configuration and construction practices of fast nondestructive testing for tunnels were developed. The filling effect of mudjack method on tunnel foundation was estimated synthetically by surface wave survey in-situ dispersion and inverse analysis. Moreover, comparing the visual results when the test model removed, the practicability of this new survey techniques and analysis methods was verified. The test results show that this surface wave survey method can detect thick concrete filling without influence of reinforcing bars, and detect mud-jack method filling effect of immersed tube tunnel fast and correctly.

Key words: surface wave survey, immersed tube tunnel, grouting quality