Ngurah Kresna Citrabhuwana, Bagus (2015) KESTABILAN LERENG PADA RUAS JALAN NASIONAL PIYUNGAN – PATUKBERDASARKAN METODE MARKLAND DAN FAKTOR GEOLOGI YANG MEMPENGARUHINYA DI KAB BANTULDAN KAB GUNUNG KIDUL, DIY. Masters thesis, UPN ''VETERAN'' YOGYAKARTA.
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Abstract
Lokasi daerah penelitian secara administrasi berada di sepanjang ruas jalan Nasional
Piyungan – Patuk, dan sekitarnya, yang termasuk di wilayah Kabupaten Bantul dan
Kabupaten Gunung Kidul, Daerah Istimewa Yogyakarta. Secara geografis berada pada
koordinat 7,50˚02’-7,52˚13’LSdan 110,27˚53’ -110,30˚36’BT, atau secara Universal
Transverse Merator (UTM) pada koordinat 441000mE – 446000mE dan 9130000mN –
9134000mN, dengan luas wilayah 5×4 km.
Daerah penelitian dikelompokkan menjadi dua satuan bentuk asal, yaitu: bentuk asal
struktural dan bentuk asal fluvial, dan dibagi lagi menjadi 3 satuan geomorfik, yaitu:
Perbukitan Homoklin (S1), Gawir Sesar (S2), dan Dataran Aluvial (F1).
Stratigrafi di daerah penelitian disusun oleh 3 satuan batuan, yaitu dari tua ke muda
Satuan Batupasir Tufan Semilir, Satuan Breksi Vulkanik Nglanggran, dan Satuan Endapan
Aluvial, dimana Satuan Batupasir Tufan Semilir memiliki hubungan stratigrafi beda fasies
dengan Satuan Breksi Vulkanik Nglanggran, dengan umur Miosen Awal – Miosen Tengah.
Satuan Endapan Aluvial terendapkan di atasnya dengan hubungan stratigrafi tidak selaras
dengan umur Holosen.
Berdasarkan analisis dengan menggunakan metode Markland dengan menggunakan
stereoplot sebagian besar plane yang ada tidak berpotongan di zona kritis dan tidak sejajar
dengan slope face. Berdasarkan analisis faktor keamanan pada daerah telitian yang terindikasi
gagal yaitu LP 54 dan LP 58 didapatkan nilai : LP 54 (FK = -0,6 (nilai puncak pada
batupasir); FK = -0,865 (nilai residu pada batupasir); FK = 0,096 (nilai puncak pada tuff); FK
= -0,41 (nilai residu pada tuff)) dan LP 58 (FK = -2,17 (nilai puncak pada batupasir); FK = -
1,753 (nilai residu pada batupasir); FK = -1,45 (nilai puncak pada tuff); FK = -1,15 (nilai
residu pada tuff)).
The location of the research area is administratically located along the Piyungan -
Patuk national road between Sleman and Gunungkidul regency in Special Region of
Yogyakarta. Geographically, it is located at 7,50˚02’-7,52˚13’ South Latitude and 110,27˚53’
-110,30˚36’ East Longitude, or at 441000 mE – 446000 mE and 9130000 mN – 9134000 mN
in Universal Transverse Mercator (UTM), within 20 km2 width area.
Based on morphologic study, the area was devided into two basic landform which are
structural landform and fluvial landform, and then devided again into three geomorphic units
which are homoklin hills geomorphic unit (S1), cesarean escarpment geomorphic unit (S2),
and alluvial geomorphic unit (F1).
The stratigraphy of this area was stacked by three litologic unit, ascending from older
to younger one, which are Semilir tuffic sandstone, Nglanggran vulcanic breccia, and
Alluvial sedimentary unit. Semilir tuffic sandstone and Nglanggran vulcanic breccia were
stratigraphically related with facies differences correlation, by the age of Early Miosen to
Middle Miosen. The Alluvial sedimentary unit was formed above those two with
unconformities correlation by the age of Holosen.
Based on Markland Method using stereoplot analysis, most of the apparent plane was
not intersect inside the critical zone and was not paralleling the slope face. Based on safety
factor analysis, the value of the failure indicated LP are : LP 54 (FK = -0,6 (peak value of
sandstone); FK = -0,865 (residual value of sandstone); FK = 0,096 (peak value of tuff); FK =
-0,41 (residual value of tuff)) and LP 58 (FK = -2,17 (peak value of sandstone); FK = -1,753
(residual value of sandstone); FK = -1,45 (peak value of tuff); FK = -1,15 (residual value of
tuff)).
| Item Type: | Thesis (Masters) |
|---|---|
| Subjek: | T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | x. Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Erny Azyanti |
| Date Deposited: | 19 May 2016 02:27 |
| Last Modified: | 19 May 2016 02:27 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/1610 |
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