ANALISIS POTENSI LIKUIFAKSI PADA WILAYAH CEKUNGAN BANDUNG DENGAN MENGGUNAKAN METODE UJI PENETRASI KONUS

Iswanti Widiya Ambarwati, Selly Feranie, Adrin Tohari

Abstract


Secara geologi, wilayah Cekungan Bandung tersusun atas lapisan endapan danau purba yang rentan terhadap risiko gempa bumi. Dengan demikian, pengetahuan mengenai potensi likuifaksi di wilayah ini sangat diperlukan untuk mengurangi risiko gempa bumi. Makalah ini menyajikan hasil evaluasi potensi likuifaksi dan penurunan tanah akibat likuifaksi dengan menggunakan metode uji penetrasi konus (CPT) dengan mempertimbangkan gempa bumi dari zona Sesar Lembang (Mw 6,5) dan zona subduksi selatan Jawa (Mw 7,0). Berdasarkan skenario gempa bumi tersebut, penurunan tanah total sangat bervariasi disebabkan oleh perbedaan ketebalan lapisan pasir lanauan di setiap lokasi. Mempertimbangkan perbedaan percepatan tanah puncak, penurunan tanah total akibat gempa bumi dari zona Sesar Lembang akan lebih tinggi dibandingkan dengan penurunan tanah total akibat gempa bumi megathrust di selatan Jawa. 

ABSTRACT - Liquefaction potential analysis in Bandung Basin area using cone penetration test method

Bandung Basin region is geologically composed of ancient lake sediments that are susceptible to earthquake risk. Therefore, knowledge of the potential for liquefaction in this region is needed to reduce the risk of earthquakes. This paper presents the results of the evaluation of the potential for liquefaction and ground settlement due to liquefaction using the CPT method by considering earthquakes from the Lembang Fault zone (Mw 6.5) and the southern Java subduction zone (Mw 7.0). Based on the earthquake scenario, the CPT locations will have a different liquefaction potential and total ground settlement due to differences in the thickness of the silty sand layer at each location. In an account of the difference in peak ground acceleration, the total ground settlement due to earthquakes from the Lembang Fault zone will be higher than that caused by the megathrust in southern Java. 


Keywords


Cekungan Bandung, gempa bumi, likuifaksi, uji penetrasi konus, rasio tegangan siklik, rasio hambatan siklik, percepatan tanah puncak

References


Afnimar, Yulianto, E., Rasmid, 2015. Geological and tectonic implication obtained from first seismic activity investigation around Lembang fault. Geoscience Letter (2), 4.

Boore, D.M., Joyner, W.B., Fumal, T. E., 1997. Equations for estimating horizontal response spectra and peak acceleration from Western North America earthquakes: A Summary of recent work. Seismological Research Letters, 128- 153.

Bronto, S., Hartono, U., 2006. Potensi sumber daya geologi di daerah Cekungan Bandung dan sekitarnya. Jurnal Geologi Indonesia 1(1), 9-18.

Dam, M.A.C., Suparan, P., Nossin, J.J., Voskuil R.P.G.A., 1996. A chronology for geomorphological developments in the greater Bandung area, West-Java, Indonesia. Journal of Southeast Asian Earth Sciences, 14(1-2), 101-115.

Daryono, M.R., Natawidjaja, H.D., Sapiie, B., Cummins, P., 2018. Earthquake geology of the Lembang Fault, West Java, Indonesia. Tectonophysics, 751, 180– 191.

Harnandi, D., Iskandar, N., Nuzulliyantoro, A.T., 2000. Pengelolaan air tanah Cekungan Bandung. Buletin Geologi Tata Lingkungan, 1-6.

Hidayat, E., Brahmantyo, B., Yulianto, E., 2008. Analisis Endapan Sagpond pada Sesar Lembang. Geoaplika, 3(3), 151–161.

Liao, S.S.C., Whitman, R.V., 1986b. Catalogue of a liquefaction and non-liquefaction occurrences during earthquakes. Research Report, Dept. Of Civil Engineering, M.I.T., Cambridge, MA.

Robertson, P.K., 1990. Soil classification using the cone penetration test. Canadian Geotechnical Journal, 27(1), 151-158.

Robertson, P.K., Wride, C.E., 1997. Cyclic liquefaction and its evaluation based on SPT and CPT: Summary Report. Proc. NCEER Workshop on Evaluation of Liquefaction Resistance of Soils, 40 p.

Robertson, P.K., Wride, C.E., 1998. Evaluating cyclic liquefaction potential using the cone penetration test. Canadian Geotechnical Journal, 35(3), 442-459.

Seed, H.B., Idriss, I.M., 1971. Simplified procedure for evaluation soil liquifaction potential. Journal of Soil Mechanics and Foundation Division, ASCE, 97(SM9), 1249 – 1273.

Silitonga, P.H., 1973. Peta Geologi Lembar Bandung, Jawa Barat, Skala 1:100.000. Pusat Penelitian dan Pengembangan Geologi, Bandung.

Sulaeman, C., Hidayati, S., 2011. Gempa bumi Bandung 22 Juli 2011. Jurnal Lingkungan dan Bencana Geologi, 2(3), 185-190.

Sujatmiko, 2003. Peta Geologi Lembar Cianjur, Jawa Barat, Skala 1:100.000. Pusat Penelitian dan Pengembangan Geologi, Bandung.

Tjia, H.D., 1968. The Lembang Fault, West Java. Geologie En Mijnbouw, 47(2), 126–130.

Tohari, A., Sugianti, K., Soebowo, E., 2011. Liquefaction potential at Padang City: a comparison of predicted and observed liquefactions during the 2009 Padang earthquake. Journal Riset Geologi dan Pertambangan, 21(1), 7-18.

Tohari, A., Sugianti, K., Syahbana, A.J., Soebowo, E., 2015. Kerentanan likuifaksi Kota Banda Aceh berdasarkan metode uji penetrasi konus. Riset Geologi dan Pertambangan, 25(2), 99 - 110.

Hutasoit, L.M., 2009. Kondisi permukaan air tanah dengan dan tanpa peresapan buatan di daerah Bandung: hasil simulasi numerik. Jurnal Geologi Indonesia, 4(3), 177-188.

Ishihara, K., Yoshimine, M., 1992. Evaluation of settlements in sand deposits following liquefaction during earthquakes. Soils and Foundations, 32(1), 173-188.

Koesoemadinata, R.P., Hartono, D., 1981. Stratigrafi dan sedimentasi daerah Bandung. Proceedings PIT X Ikatan Ahli Geologi Indonesia, Bandung, 318 - 336.

Towhata, I. 2008. Geotechnical Earthquake Engineering, publ. Springer,522 p.

USGS, 2009. M 7.0 - Java, Indonesia. United States of Geological Survey, https://earthquake.usgs.gov/earthquakes/ eventpage/usp000h152/executive. Diunduh pada tanggal 9 Mei 2019.

Van Bemmelen, R., 1949. The geology of Indonesia. Government Printing Office, The Hague, Netherlands, 732 pp.

Youd, L.T., Tinsley, J. C., Perkins, D. M., King, E. J., Perston, R. F., 1979. Liquefaction potential map of San Fransisco, California, in progress on Seismic Zonation in the San Fransisco Bay Region, USGS Circular, 807.

Youd, T. L., Idriss, I. M., Andrus, R. D., 2001. Liquefaction resistance of soils. Summary Report from the 1996 NCEER and 1998 NCEER/NSF Workshops on Evaluation of Liquefaction Resistance of Soils.J. Geotech. and Geoenv. Engg.127(10), 817-833.

Youngs, R. R., Chiou, S. J., Silva, W. J., Humphrey, J.R., 1997. “Strong ground motion attenuation relationships for subduction zone earthquakes”, Seism. Res. Lett., 68, 58-73.




DOI: http://dx.doi.org/10.14203/risetgeotam2020.v30.1038

Refbacks

  • There are currently no refbacks.


Copyright (c) 2020 RISET Geologi dan Pertambangan

Copyright of Journal RISET Geologi dan  Pertambangan (e-ISSN 2354-6638 p-ISSN 0125-9849). Powered by OJS

  

Indexed by:

     

         

 

Plagiarism checker: