Penggunaan kaedah analisis Spektrum Gelombang Permukaan (SASW) sebagai teknik baru pengelasan jasad batuan untuk geologi kejuruteraan

Translated title of the contribution: The application of Spectral Analysis of Surface Wave (SASW) method as a new rock mass classification technique in engineering geology

Abdul Rahim Samsuddin, Suharsono, Khairul Anuar Mohd Nayan, Abdul Ghani Rafek, Umar Hamzah

Research output: Contribution to journalArticle

Abstract

Spectral analysis of surface waves (SASW) is a seismic method that uses the dispersive characteristics of Rayleigh waves propagating through layered material to obtain the S-wave velocity profile. The SASW is an insitu nonintrusive method for geotechnical site characterization which is cost effective when compared to the conventional drilling method. A total of 20 stations from 13 sites were selected. A software (WINSASW 2.0) was used for the inversion process to produce S-wave velocity versus depth profiles. These profiles were then separately analyzed in relation to several engineering rock mass geological parameters such as stiffness, rock quality designation (RQD), anisotropy and the excavatability properties. The analysis of the SASW data was based on the assumption that the rock mass is an isotropic homogeneous material with various intensity of discontinuity which influenced the velocity of surface wave propagation within the rock mass. Measurement of dynamic soil properties was carried out employing the shear wave velocities and the N values of the Standard Penetration Test (NSPT) from borehole data. A new linear equation Vs = 4.44 NSPT + 213.84 which relates S-wave and NSPT was deduced. An empirical equation is also proposed to calculate RQD values based on S-wave velocity derived from SASW and that of ultrasonic tests. The result of this equation was found to be less than 10% difference in comparison to the RQD obtained from actual borehole data. An anisotropic analysis of the rock mass was carried out using S-wave velocities derived from SASW measurements in four directions. The plots of S-wave - ultrasonic velocity ratio versus ultrasonic velocity were used to evaluate the excavatability properties of rock mass. Five classes of rock mass excavability wereproposedin relation to easy digging, easy ripping, hard ripping, hydraulic breaking and blasting.

Original languageUndefined/Unknown
Pages (from-to)177-184
Number of pages8
JournalSains Malaysiana
Volume37
Issue number2
Publication statusPublished - Jun 2008

Fingerprint

rock mass classification
engineering geology
spectral analysis
surface wave
S-wave
rock quality designation
wave velocity
penetration test
rock
borehole
seismic method
site characterization
Rayleigh wave
method
velocity profile
blasting
wave propagation
stiffness
soil property
discontinuity

Keywords

  • Anisotropy
  • Discontinuity
  • Rock mass
  • Rock quality designation
  • Spectrum analysis
  • Surface wave

ASJC Scopus subject areas

  • General

Cite this

Penggunaan kaedah analisis Spektrum Gelombang Permukaan (SASW) sebagai teknik baru pengelasan jasad batuan untuk geologi kejuruteraan. / Samsuddin, Abdul Rahim; Suharsono, ; Mohd Nayan, Khairul Anuar; Rafek, Abdul Ghani; Hamzah, Umar.

In: Sains Malaysiana, Vol. 37, No. 2, 06.2008, p. 177-184.

Research output: Contribution to journalArticle

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abstract = "Spectral analysis of surface waves (SASW) is a seismic method that uses the dispersive characteristics of Rayleigh waves propagating through layered material to obtain the S-wave velocity profile. The SASW is an insitu nonintrusive method for geotechnical site characterization which is cost effective when compared to the conventional drilling method. A total of 20 stations from 13 sites were selected. A software (WINSASW 2.0) was used for the inversion process to produce S-wave velocity versus depth profiles. These profiles were then separately analyzed in relation to several engineering rock mass geological parameters such as stiffness, rock quality designation (RQD), anisotropy and the excavatability properties. The analysis of the SASW data was based on the assumption that the rock mass is an isotropic homogeneous material with various intensity of discontinuity which influenced the velocity of surface wave propagation within the rock mass. Measurement of dynamic soil properties was carried out employing the shear wave velocities and the N values of the Standard Penetration Test (NSPT) from borehole data. A new linear equation Vs = 4.44 NSPT + 213.84 which relates S-wave and NSPT was deduced. An empirical equation is also proposed to calculate RQD values based on S-wave velocity derived from SASW and that of ultrasonic tests. The result of this equation was found to be less than 10{\%} difference in comparison to the RQD obtained from actual borehole data. An anisotropic analysis of the rock mass was carried out using S-wave velocities derived from SASW measurements in four directions. The plots of S-wave - ultrasonic velocity ratio versus ultrasonic velocity were used to evaluate the excavatability properties of rock mass. Five classes of rock mass excavability wereproposedin relation to easy digging, easy ripping, hard ripping, hydraulic breaking and blasting.",
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