STUDY OF SLOPE GEOMETRY EFFECT ON 2D AND 3D SLOPE STABILITY ANALYSIS USING EQUILIBRIUM METHOD AND ITS APPLICATION FOR NICKEL OPEN MINE
Slope stability analysis is usually done in 2D because it is simpler than 3D analysis. Therefore, there are just a few cases that are done in 3D. However, if it is seen from its width of slope assumption, 2D analysis can be unrepresentative because of the infinite width of slope assumption. By an...
Saved in:
| Main Author: | |
|---|---|
| Format: | Theses |
| Language: | Indonesia |
| Subjects: | |
| Online Access: | https://digilib.itb.ac.id/gdl/view/43735 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Slope stability analysis is usually done in 2D because it is simpler than 3D analysis.
Therefore, there are just a few cases that are done in 3D. However, if it is seen from
its width of slope assumption, 2D analysis can be unrepresentative because of the
infinite width of slope assumption. By analysing a slope in 3D the obtained result can
be more acceptable because it is considered the limit of the width of a failure.
Moreover, the volume of failure can also be estimated so it can be used as a
consideration in the decision making in accordance with the slope function.
The results of this study prove the width of the 3D slope is very influential on the 2D
slope geometry, where the results of the new 2D FK are almost the same as the 3D
FK can be accepted if the ratio between width (W) and height (H) is: for height 3 m
and 6 m the W/H ratio is 3,3, for height 12 m the W / H ratio is 2,5, and height 24 m
the W/H ratio is 2,1 with limonite, saprolite and bedrock material. The results of 3D
FK are greater than 2D FK, this is also due to the influence of the ratio of the width
of the slope to the height of the slope. In 2D analysis, the width of the slope width is
considered to be infinite (infinite arc field), whereas in the 3D analysis the width of
the slope has a limit (landslide field in the form of 1/4 ball). Thus the results obtained
must be different, both the FK value and the location of the landslide field.
The geometry of the results of this study was applied at PT Gag Nickel. Based on the
results of the analysis with a slope height of 24 m, width 96 m, with an angle of 320
obtained a 3D FK of 1,28 with a PoF of 13%, a 2D FK of 1.25 with a PoF of 13,7%
and the volume of potential landslides obtained was 25.952 m3. |
|---|