Integral analysis of geoelectrical (resistivity) and geotechnical (SPT) data in slope stability assessment
Geoelectrical survey and the geotechnical SPT (N value) method were used to investigate the stability of a slope together with the influence of heterogeneous geomaterials in wet tropical region. The integration of these different field methods provides an opportunity to understand some relationship...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Published: |
UniversityPublications.net
2012
|
| Subjects: | |
| Online Access: | http://www.universitypublications.net/ajs/index.html http://www.universitypublications.net/ajs/index.html http://eprints.uthm.edu.my/3962/1/SNG198.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Geoelectrical survey and the geotechnical SPT (N value) method were used to investigate the
stability of a slope together with the influence of heterogeneous geomaterials in wet tropical
region. The integration of these different field methods provides an opportunity to understand
some relationship regarding the subsurface ground stiffness status through a combination of
geophysical and geotechnical analysis. The analysis shows that the zone with high resistivity
value generally have high N value, which stand for high stiffness and vice versa. However,
some zones with low resistivity value are not accompanied by a decrease of its N value and
sometimes even showing a higher N value. These contradictions show that one should be
careful to directly correlate resistivity value with the actual status of the heterogeneous
subsurface geomaterials. A low resistivity zone may be weak status due to a result of water
conductivity or/and heterogeneous geomaterials condition. Additional physical geological
mapping and laboratory test shows that the complexity of the subsurface profile in terms of
geomaterials, geological structure and water seepage influence the contra zone, thus resulting
for some inconsistency of resistivity value. The actual position of geoelectrical spread line and
borehole drilling point conducted are also contributing a significant opposition findings.
Therefore, multiple integration explorations should be planned to reduce the uncertainty in
application of geophysical methods to slope instability assessment in order to compensate the
resistivity finding of subsurface heterogeneous geomaterials. |
|---|