Rivanda, Muhammad Ilham Rizqo (2023) GEOLOGI DAN PENGARUH SIFAT FISIK MEKANIK SATUAN BATUGAMPING PACIRAN TERHADAP KESTABILAN LERENG DESA TEGALDOWO DAN SEKITARNYA KECAMATAN GUNEM KABUPATEN REMBANG PROVINSI JAWA TENGAH. Other thesis, UPN 'Veteran" Yogyakarta.
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Abstract
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ABSTRAK
Penelitian yang dilakukan di Desa Tegaldowo dan sekitarnya, Kecamatan Gunem,
Kabupaten Rembang, Provinsi Jawa Tengah.Pada daerah tersebut memiliki lereng yang cukup
terjal Kecenderungan lereng untuk runtuh dalam kegiatan tambang terbuka dipengaruhi oleh
sifat fisik dan mekanik massa batuan.Kajian geologi perlu dilakukan seperti stratigrafi untuk
mengetahui persebaran litologi, struktur geologi untuk mengetahui proses tektonik yang
berkembang di lokasi penelitian. Kajian geologi ini akan mempengaruhi rekayasa geologi teknik
kestabilan lereng di tambang terbuka. Penelitian dilaksanakan pada blok yang telah selesai
dilakukan penambangan yang bertujuan untuk mengetahui nilai faktor keamanan lereng daerah
penelitian sebagai upaya untuk mencegah terjadinya longsor, serta pemberian rekomendasi
geometri lereng yang aman, efisien, dan ekonomis
Pengambilan data primer dilakukan melalui pengamatan kondisi litologi, pemetaan
scanline, dan pengukuran geometri lereng, serta didukung data sekunder yang diperoleh dari
inventaris perusahaan dan sumber terkait. Analisis kinematik dengan Metode yang digunakan
Kriteria Keruntuhan Generalized Hoek-Brown dilakukan dengan bantuan software Phase 2.
Pola pengaliran lokasi penelitian terdiri dari pola pengaliran ubahan subparalel dengan
arah umum N 160°E dan pola pengaliran ubahan subdendritik dengan orientasi arah umum yaitu
N 92°E. Lokasi penelitian terdiri terdiri 4 bentuk lahan yaitu,lereng struktural perbukitan
karst,perbukitan karst dan lereng denudasi. Satuan batuan paling tua yaitu pada daerah
penelitian yaitu satuan Batupasir karbonatan Ngrayong berumur Miosen Tengah (N.12) yang
diendapkan di. Kemudian diendapkan satuan Batugamping kalkarenit Bulu secara selarans yaitu
pada (N.12-N.14) Satuan Batugamping terumbu paciran merupakan satuan batuan termuda yaitu
berumur Pliosen Awal (N.19) Struktur geologi yang berkembang memiliki orientasi arah N-S
dan sesar berkaitan dengan sesar RMKS.Dengan kondisi massa batuan rata-rata memiliki RQD
sebesar 99,721% (sangat baik), RMR 76,333 (baik), GSI sebesar 71,333 (baik), serta SMR 65º
(Laubscher, 1975), 74,533º (Hall, 1985), dan 80,726º (Orr, 1992). Pada ketiga blok batuan
berpotensi terjadi longsoran baji yaitu blok K5 dengan arah longsoran N260ºE berarah barat
daya, blok N3 dengan arah longsoran N287ºE berarah barat laut, dan blok O2 dengan arah
longsoran N341ºE berarah barat laut.Hasil Analisa menunjukan kenaikan sifat mekanik massa
batuan (kohesi) dapat meningkatkan nilai kestabilan lereng (FK) yang signifikan, karena
berkaitan dengan meningkatnya gaya penahan pada tubuh lereng. Sedangkan kenaikan sifat fisik
massa batuan (natural density) dapat mengurangi kestabilan lereng
Kata kunci : analisa kestabilan lereng,faktor keamanan,satuan batuan, sifat fisik, sifat
mekanik,
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ABSTRACT
The research was conducted in Tegaldowo Village and its surroundings, Gunem District,
Rembang Regency, Central Java Province. The area has quite steep slopes. The tendency for
slopes to collapse in open pit mining activities is influenced by the physical and mechanical
properties of the rock mass. Geological studies need to be carried out as follows: stratigraphy to
determine the distribution of lithology, geological structure to determine the tectonic processes
that developed at the study site. This geological study will affect the engineering geology of
slope stability engineering in open pit mines. The research was carried out on blocks that had
been completed mining with the aim of knowing the value of the slope safety factor in the
research area as an effort to prevent landslides, as well as providing recommendations for safe,
efficient and economical slope geometry.
Primary data collection was carried out by observing lithological conditions, scanline
mapping, and slope geometry measurements, and supported by secondary data obtained from
company inventories and related sources. Kinematic analysis with the method used Generalized
Hoek-Brown Collapse Criteria was carried out with the help of Phase 2 software.
Primary data collection was carried out by observing lithological conditions, scanline
mapping, and slope geometry measurements, and supported by secondary data obtained from
company inventories and related sources. Kinematic analysis with the method used Generalized
Hoek-Brown Collapse Criteria was carried out with the help of Phase 2 software. The drainage
pattern at the study site consists of a subparallel alternating flow pattern with a general
direction of N 160°E and a subdendritic altered flow pattern with a general orientation of N
92°E. The research location consists of 4 landforms, namely, structural slopes of karst hills,
karst hills and denudation slopes. The oldest rock unit in the study area is the Ngrayong
carbonate sandstone unit of Middle Miocene age (N.12) which was deposited at. Then the Bulu
calcarenite Limestone unit was deposited in harmony, namely at (N.12-N.14). The Paciran reef
limestone unit is the youngest rock unit, which is Early Pliocene (N.19) The developing
geological structure has an N-S direction orientation and the fault is related to the RMKS
fault .With rock mass conditions, the average RQD is 99.721% (very good), RMR is 76.333
(good), GSI is 71.333 (good), and SMR is 65º (Laubscher, 1975), 74.533º (Hall, 1985), and
80.726 º (Orr, 1992). The three rock blocks have the potential for wedge avalanches, namely
block K5 with an avalanche direction of N260ºE trending southwest, block N3 with an
avalanche direction of N287ºE trending northwest, and block O2 with an avalanche direction of
N341ºE trending northwest. The analysis results show an increase in the mechanical properties
of the rock mass (cohesion ) can significantly increase the value of slope stability (FK), because
it is associated with an increase in the retaining force on the body of the slope. While the
increase in the physical properties of the rock mass (natural density) can reduce the stability of
the slope.
Keywords: mechanical properties, physical properties, rock units, slope stability analysis,
safety factor,
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | mechanical properties, physical properties, rock units, slope stability analysis, safety factor, |
| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Geography |
| Depositing User: | Eko Yuli |
| Date Deposited: | 24 Feb 2023 02:47 |
| Last Modified: | 24 Feb 2023 02:47 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/32734 |
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