Abstract
This research explores the use of the seismic surface wave technique which is called as a spectral analysis of surface wave (SASW) for investigating the shallow soil profile. The testing was conducted on soft ground located at Universiti Tun Hussein Onn Malaysia (UTHM). The testing was conducted using a new developed in-house seismic surface wave testing system. An impact source using 5 kg hammer is used to generate seismic energy and four differencesarrangement of the source to receiver distances to produce soil profile. The profile of phase velocity was obtained at a depth of 0.15 m to 1.8 m were between 68 m/s and 95 m/s. The results were calibrated with the hand vane shear test which is used to obtain the undrained shear strength and thus converted empirically to seismic velocity at 45 m/s and 95 m/s. The result shows good agreement between velocity obtained from the surface wave testing system and hand vane shear test. Therefore, the new developed in-house seismic surface wave system has been proven can be used to determine the seismic velocity at shallow depth.
Highlights
The seismic based method is an advantage in the Geotechnical field due to the seismic velocity can be empirically derived to elastic parameters such as young modulus, bulk modulus and shear modulus [1]
When the material has different stiffness in depth, the surface wave velocity varies with frequency or wavelength, the surface wave velocity dispersed with depth
This study investigated the new developed in-house seismic surface wave testing system and tested on soft ground at Universiti Tun Hussein Onn Malaysia (UTHM)
Summary
The seismic based method is an advantage in the Geotechnical field due to the seismic velocity can be empirically derived to elastic parameters such as young modulus, bulk modulus and shear modulus [1]. The advantages for using seismic surface wave technique are cost effective because this technique offers a non- intrusive and non-destructive method. There are two types of seismic waves; which are body waves and surface waves. The body wave identifies the soil profile via reflected and refracted wave when the soil changes its stiffness. The surface waves utilized wave frequencies in order to identify the soil profile. When the material has different stiffness in depth, the surface wave velocity varies with frequency or wavelength, the surface wave velocity dispersed with depth. The characteristic surface wave velocities are a function of a frequency or wavelength [2]. This dispersive characteristic will help to perform a soil profiling. This study investigated the new developed in-house seismic surface wave testing system and tested on soft ground at Universiti Tun Hussein Onn Malaysia (UTHM)
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