LANDSLIDE AND SLOPE STABILITY USING GEOPHYSICAL METHODS
| Presenter | : | NORDIANA BT. MOHD. MUZTAZA |
| : | - | |
| Date | : | 17 / 12 / 2009 |
| Time | : | 4.00 PM |
| Venue | : | BILIK PENGAJIAN SISWAZAH (ARAS 3), PUSAT PENGAJIAN SAINS FIZIK |
| Sypnosis | : | Landslides often involves slopes are always in correlation with hilly areas. Development for tourism and residential is still rampant in these areas. To avoid landslide, slope stability and disturbance of the ecosystem, good and detailed planning must be done when developing hilly area. The study on landslide and slope stability was conducted at Bukit Antarabangsa and Hulu Yam, Selangor using electrical imaging resistivity 2-D and seismic refraction. The results were supported by borehole records and laboratory soil resistivity test of soil samples. Resistivity results from both locations show that the study areas consist of two main zones. The first zone is alluvium/highly weathered (100-1000 Ωm) with 20-70 meter depth. The second zone is granite bedrock (>3500 Ωm) with depth >70 meter. While seismic results show both locations consist of three main layers. First layer with velocity of 300-440 m/s is topsoil. Second layer with 480-1500 m/s velocity (alluvium/highly weathered layer) with a depth of 5-20 meter. Third layer is weathered granite bedrock/fractured with a velocity >2000 m/s. Laboratory soil test resistivity of the samples show that alluvium/highly weathered has resistivity value of 216 Ωm (Bukit Antarabangsa) and 578 Ωm (Hulu Yam). This values are in the range of standard resistivity value at Bukit Antarabangsa and Hulu Yam. Saturated zone (0-100 Ωm) caused by groundwater flow and the existence of faults also contribute to landslides. |
- Hits: 1909