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Application of Seismic Refraction Method in Geotechnical Study

The document discusses the application of seismic refraction methods for a geotechnical study in Al-Falah, Libya. Seismic refraction was used to determine the depth and velocity of bedrock layers and calculate elastic properties in different zones. Orthogonal seismic profiles were collected in seven subzones using geophones spaced 5 meters apart and three shot points. P and S wave velocities were calculated from time-distance curves to estimate properties in up to three layers. Seismic velocity is dependent on the physical properties of the medium like density, bulk modulus, and shear modulus. Therefore, seismic refraction can be used to estimate these parameters and how they change with different rock properties.

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Roland Rawlins Igabor
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49 views1 page

Application of Seismic Refraction Method in Geotechnical Study

The document discusses the application of seismic refraction methods for a geotechnical study in Al-Falah, Libya. Seismic refraction was used to determine the depth and velocity of bedrock layers and calculate elastic properties in different zones. Orthogonal seismic profiles were collected in seven subzones using geophones spaced 5 meters apart and three shot points. P and S wave velocities were calculated from time-distance curves to estimate properties in up to three layers. Seismic velocity is dependent on the physical properties of the medium like density, bulk modulus, and shear modulus. Therefore, seismic refraction can be used to estimate these parameters and how they change with different rock properties.

Uploaded by

Roland Rawlins Igabor
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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World Academy of Science, Engineering and Technology

Civil and Environmental Engineering Vol:2, No:3, 2015

International Science Index Vol:2, No:3, 2015 waset.org/abstracts/23904

Application of Seismic Refraction Method in Geotechnical Study


Authors : Abdalla Mohamed M. Musbahi
Abstract : The study area lies in Al-Falah area on Airport-Tripoli in Zone (16) Where planned establishment of complex multifloors for residential and commercial, this part was divided into seven subzone. In each sup zone , were collected Orthogonal
profiles by using Seismic refraction method. The overall aim with this project is to investigate the applicability of Seismic
refraction method is a commonly used traditional geophysical technique to determine depth-to-bedrock, competence of
bedrock, depth to the water table, or depth to other seismic velocity boundaries The purpose of the work is to make engineers
and decision makers recognize the importance of planning and execution of a pre-investigation program including geophysics
and in particular seismic refraction method. The overall aim with this thesis is achieved by evaluation of seismic refraction
method in different scales, determine the depth and velocity of the base layer (bed rock). Calculate the elastic property in each
layers in the region by Using the Seismic refraction method. The orthogonal profiles was carried out in every subzones of (zone
16). The layout of the seismic refraction set up is schematically, the geophones are placed on the linear imaginary line whit a 5
m spacing, the three shot points (in beginning of layout mid and end of layout) was used, in order to generate the P and S
waves. The 1st and last shot point is placed about 5 meters from the geophones and the middle shot point is put in between
12th to 13th geophone, from time distance curve the P and S waves Was calculated and the thickness was estimated up to
three-layers. As we know any change in values of physical properties of medium (shear modulus, bulk modulus, density) leads
to change waves velocity which passing through medium .where any change in properties of rocks cause change in velocity of
waves. because the change in properties of rocks cause change in parameters of medium density (), bulk modulus (), shear
modulus (). Therefore the velocity of waves which travel in rocks have close relationship with these parameters. Therefore we
can estimate theses parameters by knowing primary and secondary velocity (p-wave, s-wave).
Keywords : application of seismic, geotechnical study, physical properties, seismic refraction

International Scholarly and Scientific Research & Innovation 2(3) 2015

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