ANALISIS STABILITAS DAN MEKANISME KERUNTUHAN LERENG BATUAN SEDIMEN TAMBANG TERBUKA BATUBARA KECAMATAN MUARALAWA DAN KECAMATAN DAMAI KABUPATEN KUTAI BARAT PROPINSI KALIMANTAN TIMUR
Rock mass in nature tend to not ideal as a heterogeneous, anisotropic and discontinuous. The existence of these discontinuities resulting the distribution of strength and stress in the rock mass is not evenly distributed in all directions, and then make the elasticity properties of rock mass bein...
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| Format: | Theses and Dissertations NonPeerReviewed |
| Published: |
[Yogyakarta] : Universitas Gadjah Mada
2015
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| Online Access: | https://repository.ugm.ac.id/134640/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=77603 |
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| Institution: | Universitas Gadjah Mada |
| Summary: | Rock mass in nature tend to not ideal as a heterogeneous, anisotropic and
discontinuous. The existence of these discontinuities resulting the distribution of
strength and stress in the rock mass is not evenly distributed in all directions, and
then make the elasticity properties of rock mass being changed, then in end it's
resulting disruptions to the balance of rock mass strength and occurrence of
collapse of slopes. This study aims to determine the slope failure mechanisms in the
area of case study as well as variations based on RMR, GSI, SMR, kinematic
analysis, numerical analysis and monitoring approach slope movement, in a coal
mine slope applications.
The implementation of site investigations obtained information that there has been
a collapse slope conditions.In geomorphology slope at a time prior to the collapse
of a slope of 38 ° with a height of 94m, strike slope of N 245 E and direction of
slope surface of 335 °.After the collapse the slope become 25º, and the slope after
the collapse materials are cleared become 35 º. Results of the discontinuity
mapping is obtained 5 sets of discontinuities, and the data were developed to obtain
the value of RMR. The results of piezometer measurements at occurrence of
collapse conditions of the slopes at elevations 44,40m. Displacement value from
monitoring SSMR when the slope was being collapse in two stages, the first stage
is valued at 70,61cm (a more critical condition, the value is rounded down to 70cm
to the implementation in modeling) and the second phase valued at 124,25cm.
Value of RMR89 in this study is greater than the value of GSI and SMR. On the
average obtained 34.67 for RMR89 values and 29.67 for GSI values, then these
rocks can be classified into Poor Rock in class number IV. The result of kinematic
analyze , founded sliding planar failure at dips 36°, and wedge failure at dips 36°,
35° and 34°. Acquisition SMR value obtained at 25, 27, 28 and 29. That SMR values
is classified the rock mass quality into class number IV, the description of the rock
mass is relatively poor, the slope stability is low or unstable and the collapse
manifold is planar or wedge failure. The results from the analysis of the model with
its criteria obtained the un-collapse conditions at angle 29 °. It is recommended to
use 29 ° of angles to be used for repair the slopes, and a recommendation to be
used for overall highwall slope angle. Type of collapse that occurred on the slope
failure mechanisms in all of the analysis that has been done, it is known that the
mechanisms involved are complex types (combine of wedge Failur, planar failure,
and step_path failure) or classified into large scale rock slope failure surface. |
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