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Seismic surface wave nondestructive testing system

Zainudin, Siti Zuraidah (2015) Seismic surface wave nondestructive testing system. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

The geophysical methods such as seismic surface wave offer advantages in the geotechnical site investigation via non-destructive testing. The geophysical methods have been widely used to detect any spatial material property changes which cannot be seen through our naked eyes. Therefore, this research focused on a development of the seismic wave technique of surface wave using in situ non-destructive testing. The method presented in this research is by obtaining the surface wave phase velocity of two different materials in order to develop the graph of phase velocity versus wavelength. This researcher utilizes two different seismic surface wave techniques in one seismic complete system. The two seismic surface wave techniques used are the Spectral Analysis Surface Wave (SASW) and Continuous Surface Wave (CSW). This research explores the effect of the relationship between source and receiver distance for both methods. The experiments have been conducted on known materials; where the CSW system has been used on a concrete mortar (hgh velocity). The ratio for this concrete mortar is 1: 15; cement and sand, while 1 m x 1 m x 1.5 m for its dimension. Meanwhile, the SASW system has been used to test for sofi soil (low velocity) conducted at the Research Center for Soft Soil, UTHM test site. The CSW method is based on generating a mono-frequency source using piezoelectric transducers in order to produce a high seismic energy. For SASW method, an impact source using a hammer is used to generate the lower range of seismic energy. The seismic recording used in this research includes a pair of accelerometer sensors and National Instrument data acquisition system. The collected data are stored, and processed after the completion of a data acquisition session. The portable personal computer with the developed Matlab programmed has been used to control the SASW and CSW systems and the data acquisition during site investigation. The average phase velocity obtained in this research for concrete mortar is 374.29 m/s which is between 0.05 m to 0.6 m wavelength. Meanwhile, for SASW system the average phase velocity of soil at a wavelength of 0.34 m to 3.5 m is 75.03 d s

Item Type: Thesis (Masters)
Subjects: Q Science > QE Geology
Depositing User: Normajihan Abd. Rahman
Date Deposited: 19 Jan 2016 07:43
Last Modified: 19 Jan 2016 07:43
URI: http://eprints.uthm.edu.my/id/eprint/7483
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