Karakteristik Sifat Fisis Tanah Daerah Potensi Longsor di Jalan Raya Sumbar Riau Nagari Koto Alam, Sumatera Barat
DOI:
https://doi.org/10.25077/jfu.10.1.123-129.2021Abstract
Pengukuran sifat fisis tanah pada lereng yang sudah terjadi longsor dan lereng yang diduga belum terjadi longsor di Nagari Koto Alam telah dilakukan menggunakan metode ASTM. Sampel tanah diambil pada bagian atas, tengah, dan bawah lereng dengan kedalaman 30 cm dan 75 cm dari permukaan lereng. Hasil pengukuran sifat fisis tanah menunjukkan bahwa jenis tanah dari keempat lereng didominasi oleh lempung dan tanah liat berpasir, dengan rentang nilai koefisien keseragaman dari 2,22 sampai 7,69, nilai koefisien gradasi dengan rentang 0,54 sampai 1,44, nilai berat spesifik dari rentang 2,58 sampai 2,70, dan kadar air jenuh tanah dari rentang 34,95 sampai 43,75. Lereng berjenis tanah lempung serta mempunyai nilai koefisien keseragaman lebih kecil dari enam dan koefisien gradasi kecil dari satu, ditambah nilai kadar air jenuh besar dari 40% miliki potensi yang besar terjadinya longsor. Satu dari empat lereng uji memiliki potensi terjadinya longsor pada kedalaman 75 cm dan tiga lereng lainnya memiliki potensi kedalaman 75 cm dari permukaan lereng.
Â
Measurement  of the physical properties of soil on slpes where landslide have occurred and slopes that are not speculated to have occurred  in Nagari Koto Alam have been carried out using the ASTM method. Soil sampels were taken from  the top, middle, and bottom slopes with a depth of 30 cm and 75 cm from the slope surface. The result of the measurement of physical properties of the soil show that the soil types of the four slopes are dominated by clay and sandy clay, with a range of uniformity coefficient values from 2.22 to 7.69, gradiation coefficient values ranging from  0.54 to 1.44, specific gravity values ranging from 2.58 to 2.70, and saturated soil moisture content in the range 34.95 % to 43.75%. Slopes are clay type and have a uniformity coefficient value of less than six, and  gradient coefficient less than  one, plus a saturated water content value greater than 40% has a great potential for landslides. One of the four test slopes has the potential for landslides to occur at a depth of 75 cm and the other three slopes have a potential depth of 75 cm from the slope surface.
Â
References
Armayani, A., 2012, Studi Sifat fisis Batuan Pada Daerah Rawan Longsor Kecamatan Parangloe Kabupaten Gowa Sulawesi selatan, Skripsi, Jurusan Fisika FMIPA, Universitas Islam Negeri Alauddin, Makasar.
Istijono, B., Hakam, A., Ophiyandri, T., 2016. Landslide hazard of Maninjau area, International Journal of Disaster Resilience in the Built Environment, 7 (3): 302-312.
Mugagga, F., Kakembo, V., Buyinza, M., 2012. A characterisation of the physical properties of soil and the implications for landslide occurrence on the slopes of Mount Elgon, Eastern Uganda, Natural Hazards, 60:1113–1131.
Mulyono, A., Iqbal, P., 2015, Karakteristik Fisis Tanah Longsoran di Jalur Transek Liwa-Bukit Kemuning, Lampung Barat, Jurnal Lingkungan dan Bencana Geologi, 6 (1): 9-18.
Perwitasari, D., 2010, Kajian Sifat Fisis Dan Daya Dukung Tanah Pada Ruas Jalan Sekincau – Suoh Kabupaten Lampung Barat, Skripsi, Fakultas Teknik Universitas Lampung, Bandar Lampung.
Rai, M.A., Kramadibrata, S., dam Watimena, R.K., 2013, Mekanika Batuan, ITB Press, Bandung.
https://www.antaranews.com/berita/1201808/lalu-lintas-sumbar-riau-putus-akibat-longsor-terjang kawasan-koto-alam (diakses 01 Maret 2020).
https://www.astm.org/Standard/standards-and-publications.html (diakses 04 Juni 2020).
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2021 Jurnal Fisika Unand
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Please find the rights and licenses in JFU (Jurnal Fisika Unand).
1. License
The non-commercial use of the article will be governed by the Creative Commons Attribution license as currently displayed on Creative Commons Attribution-NonCommercial 4.0 International License.
2. Authors Warranties
The author warrants that the article is original, written by stated author(s), has not been published before, contains no unlawful statements, does not infringe the rights of others, is subject to copyright that is vested exclusively in the author and free of any third party rights, and that any necessary written permissions to quote from other sources have been obtained by the author(s).
3. User Rights
JFU's spirit is to disseminate articles published are as free as possible. Under the Creative Commons license, JFU permits users to copy, distribute, display, and perform the work for non-commercial purposes only. Users will also need to attribute authors and JFU on distributing works in the journal.
4. Rights of Authors
Authors retain the following rights:
- Copyright, and other proprietary rights relating to the article, such as patent rights,
- The right to use the substance of the article in future own works, including lectures and books,
- The right to reproduce the article for own purposes, provided the copies are not offered for sale,
- The right to self-archive the article.
5. Co-Authorship
If the article was jointly prepared by other authors, the signatory of this form warrants that he/she has been authorized by all co-authors to sign this agreement on their behalf, and agrees to inform his/her co-authors of the terms of this agreement.
6. Termination
This agreement can be terminated by the author or JFU upon two months notice where the other party has materially breached this agreement and failed to remedy such breach within a month of being given the terminating partys notice requesting such breach to be remedied. No breach or violation of this agreement will cause this agreement or any license granted in it to terminate automatically or affect the definition of JFU.
7. Royalties
This agreement entitles the author to no royalties or other fees. To such extent as legally permissible, the author waives his or her right to collect royalties relative to the article in respect of any use of the article by JFU or its sublicensee.
8. Miscellaneous
JFU will publish the article (or have it published) in the journal if the articles editorial process is successfully completed and JFU or its sublicensee has become obligated to have the article published. JFU may conform the article to a style of punctuation, spelling, capitalization, referencing and usage that it deems appropriate. The author acknowledges that the article may be published so that it will be publicly accessible and such access will be free of charge for the readers.
