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Application of Integrated Geophysical Technique for
the mapping of old Foundation Pilings at Penang
Sentral,Butterworth, P...
• Problem statement
• Site Layout
• Planned Geophysical techniques
• Methods overview
• Survey layout.
• Results
Problem Statement
The site under investigation is planned for new
development project at Pulau Pinang state. 20 years ago
...
Phase 1
Parking
Taxi
area
Bus area
The site is a connection center where various
land and marine transportation exist. These
facilities are:
1- The ferry tha...
Foundation Piles can be
detected through these
properties:
1. Density contrast.
2. Shear wave velocity.
3. Magnetic proper...
Hence the following
Methods was
proposed
1.Gravity.
2.Magnetic gradiometer
3.Multichannel Analysis of Surface waves.
4.Tim...
CG-5
autograv
Although density contrast exist
between concrete piling and
surrounding soil, the area is too
noisy that we ...
Preliminary test
showed good
results confirmed
by field
inspection.
Example in figure
shows high
anomaly at
MASW (Multichannel analysis of
surface waves).
Two problems when
test MASW at the
site. These
problems are the
high noise ...
GPR
The method gave good
result as shown in the
figure.
Methods Used
1- Magnetic Gradiometer
2- GPR
Magnetic Gradiometer
The technique uses
measurements from
two proton
magnetometer
aligned vertically at
a spacing of 1m. T...
GPR
The technique produce
profiles similar to
seismic reflection
profile. An
electromagnetic pulse is
sent to the subsurfa...
Survey Layout
Grid points at 5m separation.
Results
Results (cont.)
conclusion
• Old foundation piling decelerate the
establishment of new development project
• Near surface geophysical meth...
‫جزيال‬ ‫شكرا‬
Terima Kasih
Thank you
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Application of integrated geophysical technique for the mapping

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Paper presented at Arab Conference for Astronomy and Geophysics. Cairo, 17-20 October 2016.

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Application of integrated geophysical technique for the mapping

  1. 1. Application of Integrated Geophysical Technique for the mapping of old Foundation Pilings at Penang Sentral,Butterworth, PulauPenangMalaysia. Mohd Nawawi and Amin E. Khalil PPSF, Universiti Sains Malaysia
  2. 2. • Problem statement • Site Layout • Planned Geophysical techniques • Methods overview • Survey layout. • Results
  3. 3. Problem Statement The site under investigation is planned for new development project at Pulau Pinang state. 20 years ago another project was established at the site. However, the project as cancelled and the buildings were removed and the foundations was buried. These buried foundation piles decelerated the construction of the new project. This is motivation of the present work.
  4. 4. Phase 1 Parking Taxi area Bus area
  5. 5. The site is a connection center where various land and marine transportation exist. These facilities are: 1- The ferry that connects Penang island with the mainland. 2- The railway station (KTM) that connect the state with other Malaysian states. 3- Rapid Penang bus station. 4- Asphaltic roads and a flyover bridge. Ferry R. Penang
  6. 6. Foundation Piles can be detected through these properties: 1. Density contrast. 2. Shear wave velocity. 3. Magnetic properties due to iron bars. 4. Resistivity 5. Dielectric constant
  7. 7. Hence the following Methods was proposed 1.Gravity. 2.Magnetic gradiometer 3.Multichannel Analysis of Surface waves. 4.Time domain electromagnetic 5.Ground Penetrating Radar GPR
  8. 8. CG-5 autograv Although density contrast exist between concrete piling and surrounding soil, the area is too noisy that we couldn’t carry out a reliable gravity survey. As a result the gravity method was excluded from the survey
  9. 9. Preliminary test showed good results confirmed by field inspection. Example in figure shows high anomaly at
  10. 10. MASW (Multichannel analysis of surface waves). Two problems when test MASW at the site. These problems are the high noise and low resolution of the method. Hence, the
  11. 11. GPR The method gave good result as shown in the figure.
  12. 12. Methods Used 1- Magnetic Gradiometer 2- GPR
  13. 13. Magnetic Gradiometer The technique uses measurements from two proton magnetometer aligned vertically at a spacing of 1m. The subtraction gives the vertical gradient of magnetic field. The gradiant enhances the near surface
  14. 14. GPR The technique produce profiles similar to seismic reflection profile. An electromagnetic pulse is sent to the subsurface, the reflected energy from anomalous surfaces is then
  15. 15. Survey Layout Grid points at 5m separation.
  16. 16. Results
  17. 17. Results (cont.)
  18. 18. conclusion • Old foundation piling decelerate the establishment of new development project • Near surface geophysical methods were employed to solve the problem. • Magnetic gradiometer and GPR showed good example for detecting old foundation piles. • Other methods couldn’t be applied because of the site conditions
  19. 19. ‫جزيال‬ ‫شكرا‬ Terima Kasih Thank you

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