Treffer: Developing a low-cost device for preliminary geotechnical site characterization using multi-channel analysis of surface wave.

Geotechnical site characterization is a fundamental requirement for any construction work as the soil properties have crucial impacts on planning, designing, and implementing any structure. In some cases, it is extremely difficult to point out the exact locations where boreholes have to be made for testing soil as the soil profile is unknown and the soil layer changes space-to-space abruptly. The miners mainly used multi-channel analysis of surface wave (MASW), a non-destructive method, to detect the rock conditions since the early 2000s. This method is also applied to geotechnical engineers for soil layer characterization. This method analyzes surface wave dispersion to determine the shear wave velocity. The conventional MASW setup is costly and is not economically feasible in developing countries like Bangladesh. This research aims to develop a low-cost device to identify the soil types layers for the preliminary geotechnical characterization. The geophone sensors collected the seismic response, transferred to a microcontroller (Arduino) based data acquisition center. Collected signals were analyzed using the MATLAB programming platform. The standard penetration test (SPT) values and the shear wave velocity of soil layers have been compared. Geophones were calibrated using an oscilloscope. The setup was tested in a selected site in Sylhet, Bangladesh, which detects three significant layers of sandy clay (N ≤ 15), fine sand (N ≤ 50), and dense sand (N > 50). This device can help geotechnical engineers identify the proper place where the boreholes have to be drilled for detailed site soil characterization. [ABSTRACT FROM AUTHOR]

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