Penelusuran Potensi Likuifaksi Pantai Padang Berdasarkan Gradasi Butiran dan Tahanan Penetrasi Standar

Authors

  • Abdul Hakam Jurusan Teknik Sipil, Universitas Andalas, Kampus Limau Manis, Padang.
  • Helmy Darjanto Jurusan Teknik Sipil, Universitas Narotama, Jl. Arif Rahman Hakim No 51, Surabaya.

DOI:

https://doi.org/10.5614/jts.2013.20.1.4

Keywords:

Gempa, Likuifaksi, Gradasi butiran.

Abstract

Abstrak. Gempa Padang 30 September 2009 telah mengakibatkan terjadinya likuifaksi pada beberapa lokasi di kota Padang. Daerah-daerah yang terlikuifaksi berada di sekitar aliran sungai atau dekat tepi pantai. Untuk mendapatkan gambaran mengenai gradasi butiran tanah terlikuifaksi, telah dilakukan analisis saringan terhadap sampel tanah terlikuifaksi. Berdasarkan hasil pengujian tersebut dan data pengeboran, dilakukan penelusuran kembali potensi likuifaksi untuk lapisan tanah disekitar Pantai Padang. Penyelidikan tanah dengan menggunakan mesin bor dan pengujian penetrasi standar hingga kedalaman tanah keras telah dilakukan pada lokasi tersebut. Selanjutnya gradasi butiran tanah pada kedalaman-kedalaman tertentu dianalisis dengan cara membandingkan kurva gradasi butiran tanah dengan kurva potensi likuifaksi. Hasil penelusuran potensi likuifaksi untuk daerah Pantai Padang menhasilkan bahwa gradasi butiran tanah dilokasi tersebut memiliki potensi likuifaksi. Hasil tersebut dikompilasikan dengan analisis potensi likuifaksi berdasarkan nilai pukulan penetrasi standar. Kedalaman tanah yang berpotensi terlikuifaksi untuk Pantai Padang berada pada lapisan dengan kedalaman kurang dari 10m.

Abstract. Padang 30 September 2009 earthquake had caused liquefaction at several locations in the city of Padang. Generally, liquefied areas were around the rivers or near the beach. In order to get the gradation of the liquefied soil, sieve analysis was conducted on soil samples. Based on those test result and drilling data, the assessment of liquefaction potential for soil layer around the coast of Padang is done. Soil investigation using deep drilling and standard penetration test to the hard layer has been done on the site. Furthermore, the soil gradations at certain depths were analyzed by comparing the gradation curve of the liquefied soil. Liquefaction potential assessment based on the soil gradation shows that the Padang Beach area has the liquefaction potential. The results are then compiled with the analysis of the liquefaction potential based on the standard penetration test. The depth of the soil layer that potentially to liquefy in Padang Beach is on the depth of less than 10m.

References

Aydan, O., Ulusay, R. dan Atak, VO., 2008, Evaluation of Ground Deformations Induced by The 1999 Kocaeli Earthquake (Turkey) at Selected Sites on Shorelines, Environ Geol 54:165-182

BMKG/USGS, 2009, September 30 2009 Strong Ground Motion Record from Padang, Recorded by BMKG (http://www.bmg.go.id/depan.bmkg) and processed by the USGS.

Das, BM., 1983, Fundamental of Soil Dynamics, New York: Elsevier Pub.

Hakam, A., 2010, Padang Liquefaction Potential, Yogyakarta: Proceeding PIT - HATTI.

Hakam A and Oscar F Nur, 2007, Liquefaction Analysis of Silty Sand Deposit Due to West Sumatra Earthquake on 6th March 2007, Padang: Proceeding of International Symposium on Disaster in Indonesia.

Seed, H. Bolton dan Idriss I.M., 1982, Ground Motion and Soil Liquefaction During Earthquake, Berkeley: Earthquake Engineering Research Institute.

Shibata, T. and Teparaksa, W., 1988, Evaluation of Liquefaction Potential of Soils Using Cone Penetration Tests, Soils and Foundations, Vol. 28., N0. 2: 49-60

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Published

2013-04-01

How to Cite

Hakam, A., & Darjanto, H. (2013). Penelusuran Potensi Likuifaksi Pantai Padang Berdasarkan Gradasi Butiran dan Tahanan Penetrasi Standar. Jurnal Teknik Sipil, 20(1), 33-38. https://doi.org/10.5614/jts.2013.20.1.4

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