Determination of shear wave velocity and shear modulus estimation of peat soil using seismic geophysical method

Mad Said, Mohd Jazlan (2016) Determination of shear wave velocity and shear modulus estimation of peat soil using seismic geophysical method. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

This research is about dynamic characterization of peat using field seismic geophysical method. There are demands on dynamic characteristics in construction due to their importance towards the society. The dynamic behaviours of peat are shear velocity (Vs) and shear modulus (G). The scope of this research is meant for peat and soft clay by using multi-channel analysis of surface wave (MASW) method and seismic refraction method. The estimation of shear modulus is based on shear wave velocity and soil bulk density using the sampler with 0.5 m depth each. Peat sampler was used to verify the soil profiles at every location except for soft clay. The shear wave velocity for peat is ranging from 26.02 – 95.89 m/s. Meanwhile, for soft clay, it has velocity from 61.25 – 86.37 m/s. As for shear modulus of peats, the range is between 0.82 – 7.26 MPa while for soft clay, the range is between 7.29 MPa – 13.92 MPa. The variations of shear wave velocity and shear modulus of peat are due to the differences in peat soils properties in term of organic content, fibre content, void ratio and moisture content for every research location. Furthermore, seismic attenuation in peat is also affected the seismic wave velocity. The dynamic behaviour of peat and soft clay have slight changes in shear wave velocity. However it has significant difference in shear modulus due to the existence of organic content that contributes to their differences. Shear wave velocity was obtained by applying seismic refraction method. The data shows the increment of velocity with depth. The determination of dynamic behaviour of peats was achieved by using seismic geophysical method have shown good findings.

Item Type:Thesis (Masters)
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA703-711 Engineering geology. Rock mechanics. Soil mechanics.
ID Code:8879
Deposited By:Mr. Mohammad Shaifulrip Ithnin
Deposited On:12 Feb 2017 12:28
Last Modified:12 Feb 2017 12:28

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