Abstract
Seismic tests are becoming more and more meaningful in modern geoengineering since they allow precise assessment of changes in the analyzed profile of soil deformation parameters at very small strain. The engineering practice generally uses two methods for such kinds of tests: reference cross-hole test and commercial down-hole method. The costs of implementation of this kind of research and the reliability of the results obtained along with any additional benefits from the type of the selected testing technique are not without significance. Seismic measurements for which comparative analysis was performed were carried out in a strongly anisotropic materials base of a tailings. The results of tests conducted with a standard cross-hole method were compared with those conducted using the down-hole method, in which the seismic piezocone (SCPTU) and seismic dilatometer (SDMT) were used. Test results have shown that in terms of assessment of their credibility, there were no fundamental differences in the quality of the recorded signals. It has been pointed out, however, that there are many advantages to penetration in situ tests, which complement identification of subsoil structure with many crucial elements that cannot be achieved using the cross-hole method.
Highlights
The non-destructive seismic testing is one of the types of in situ geophysical tests used
Regarding the fundamental questions of the reliability analysis of the seismic tests conducted with competing methods, the wave velocity distributions in the same test profiles were compared with depth
The biggest fluctuations in the velocity distribution of the shear wave with the profile depth with the repeatability of the seismic signal measurement expressed by the variation coefficient with values that do not exceed 1.5% are characteristic to the cross-hole seismic testing (CHT)
Summary
The non-destructive seismic testing is one of the types of in situ geophysical tests used. It relies on registration of the velocity of a particular type of seismic wave passing through the subsoil. Seismic measurements may be conducted as stand-alone test or in combination with another kind of in situ tests as the so-called combined test (invasive and non-destructive). The choice of an appropriate testing method may result in more or less precise identification of the subsoil parameters, which are determined based on the measurements of the seismic wave velocity. The primary aim of the study presented in the paper is comparison in terms of quality of seismic wave velocity test results
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