MODELLING OF LAND SUBSIDENCE ALONG TANAH MAS -PELABUHAN SECTION SEMARANG CITY USING FINITE ELEMENT METHOD

Dwi Sarah, Arifan J. Syahbana, R. Fajar Lubis, Asep Mulyono

Abstract


ABSTRACT Land subsidence has been an apparent problem in the northern part of Semarang city, Central Java, which has caused enormous physical and economical impacts. This area is underlain by alluvium sediments of clay, silt, sand and gravel. The nature of the alluvium soil is soft and highly compressible which induces natural consolidation to occur. The lowering of groundwater table due to exploitation and loads of building and earth fill accelerate the rate of consolidation settlement. A study of land subsidence modeling was carried out in the northern part of Semarang city. Collection and analysis of data on the geology, hydrology, soil properties and monitored settlements were conducted. Modeling of land subsidence involved stress deformation analysis using finite element method. The settlements computed for selected section of the city of Semarang were compared with measurements of settlement in the city area. The simulation results appear to be in reasonably good agreement with the measurement results. Simulation results at selected section indicated that the contribution of lowering groundwater table factor accounts for less than 50% of total monitored subsidence. Meanwhile simulation results using application of external loading and lowering of groundwater table showed better agreement with the monitored subsidence. Information of magnitude and factors causing land subsidence is important particularly for city planning purposes.

Keywords


subsidence, consolidation, soil, groundwater, external load, modeling, simulation.

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References


Abidin H.Z, Andreas H.,Gamal M., Darmawan D. ,2006. Land Subsidence Characteristics of Bandung Basin between 2000- 2005 as Estimated from GPS surveys. XXIII FIG Congress 2006 Shaping the change. Munich,Germany, 8-13 October 2006.

Abidin, H.Z., H. Andreas, R. Djaja, D.Darmawa and M. Gamal., 2008. “Land subsidence characteristics of Jakarta between 1997 and 2005, as estimated using GPS surveys”, GPS Solutions, Springer Berlin / Heidelberg, Vol. 12, No. 1, pp. 23-32.

Abidin H.Z, Andreas H., Gumilar I., Sidiq T.P., Gamal M., Murdohardono D., Supriyadi, Fukuda Y., 2010. Studying Land

Subsidence in Semarang (Indonesia) Using Geodetic Methods.FIG Congress 2010 Facing the Challenges – Building the Capacity.Sydney, Australia, 11 -16 April 2010.

http://www.fig.net/pub/fig2010/papers/fs0

d%5Cfs04d_abidin_andreas_et_al_3748.pdf

Bergado, D.T., Miura, N., Chang, J.C. and Danzuka, M., 1988. Reliability Assessment of Test Embankments on Soft

Bangkok Clay by Variance Reduction and Nearest-Neighbor Methods, Computers and Geotechnics,Vol. 4, pp. 171 -194.

Biot, M.A., 1955. Theory of elasticity and consolidation for a porous anisotropic solid, J.Appl.Phys. 26(2), pp.182-185.

Bowles, J. E., 1996. "Foundation analysis and design", 5th edition, McGraw-Hill, New York, N.Y., U.S.A., 1175 pp.

Chai J-C, Shen S-L, Zhu H-H, Zhang X-L., 2004. Land subsidence due to groundwater drawdown in Shanghai. Geotechnique 54(2):143–147.

Departemen Pekerjaan Umum., 1987. Pedoman Perencanaan Ketahanan Gempa untuk Rumah dan Gedung, KBI-1.3.5.3.1987.

Kuehn, F., Hoffmann-Rothe, A., Albiol, D., Cooksley, G., Duro J., Granda, J., Haas, S., Murdohardono, D., 2009. Detection of

land subsidence in Semarang, Indonesia using persistent scatterer interferometry. Proceedings of Asian Association on

Remote Sensing 2009. http://www.a-a-rs.org/acrs/proceeding/ACRS2009/Papers/Oral%20Presentation/TS33-03.pdf

Lay, S.W and Shieh, J.Y.H., 1995. The step loading model of subsidence induced by groundwater level changes with time.

Proceedings of the fifth International Symposium on Land Subsidence, The Hague, October 1995. IAHS Publ.no.235,

pp.313-321.

Marsudi., 2001 . Prediksi Laju Amblesan Tanah di Dataran Aluvial Semarang Propinsi Jawa Tengah. Disertasi Doktor Bidang Hidrologi- Rekayasa Pertambangan, Institut Teknologi Bandung.

Plaxis BV., 1998. Plaxis Finite Element Code for Soil and Rock Analysis, user’s manual. Plaxis BV, Delft, Netherlands.

Semarang City., 2009. Oficial website of Semarang munipality). Address :http://www.semarang.go.id/, access date: March 25, 2011.

Sudaryanto, Delinom, R.M., Suherman D, Lubis R.F, Sukmayadi D, Zaenal., 2010. Hidrologi Daerah Urban dan Pesisir : Studi Kasus Daerah Semarang dan Sekitarnya.

Laporan Teknis-tidak diterbitkan, Pusat Penelitian Geoteknologi LIPI. Bandung.

Sun H, Grandstaff D, Shagam R., 1999. Land subsidence due to groundwater withdrawal: Potential damage of subsidence and sea level rise in southern New Jersey, USA. EnvironGeol

(4):290–296.

Terzaghi, K., 1925. Erdbaumechanik auf bodenphysikalischer Grundlage, Deuticke, Wien.

Thaden, RE, Sumadirdja H, Richards.P.W., 1996. Peta Geologi Lembar MagelangSemarang, Jawa. Direktorat Geologi,

Bandung.

Tobing MHL, Syarief EA, Murdohardono D., 2001 . Penyelidikan Geologi Teknik Amblesan Daerah Semarang dan Sekitarnya, Propinsi Jawa Tengah.Laporan Penelitian. Direktorat Geologi Tata Lingkungan.

Trautmann, C. and F. Kulhawy., 1987. CUFAD A Computer program for compression and uplift foundation analysis and design. Report EL-4540-CCM, Vol 16. EPRI, 148 p.

Wroth, C. P., 1975. In situ measurement of initial stresses and deformation characteristics: state-of-the-art review. Proceedings of the conference on in situ measurement of soil

properties,Raleigh, NC, Vol. 2, pp. 181 – 230.




DOI: http://dx.doi.org/10.14203/risetgeotam2011.v21.50

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