ANALISIS DATA SEISMIK GELOMBANG PERMUKAAN PADA LAPISAN ASPAL DENGAN MENGGUNAKAN METODE SASW (SPECTRAL ANALYSIS OF SURFACE WAVE)

Yudi Pranoto

Yudi Pranoto POLITEKNIK NEGERI SAMARINDA

Abstract views: 12 ,

Fulltext downloads: 11

Keywords: Gelombang Rayleigh, kecepatan gelombang, modulus elastisitas, SASW

Abstract

Metode Spectral Analysis of Surface Wave (SASW) merupakan salah satu pengujian di lapangan yang tidak merusak, cepat, akurat dan ekonomis yang sedang dikembangkan penggunaannya dalam memperkirakan dan menilai kekuatan suatu struktur. Metode ini dibangun berdasarkan sifat perambatan gelombang rayleigh pada media yang berlapis. Penelitian ini bertujuan untuk menentukan nilai kecepatan gelombang geser dan modulus elastisitas perkerasan jalan menggunakan metode SASW pada jalan lama, baru dan jalan yang telah dioverlay. Metode SASW mengandung tiga bagian utama yaitu pengambilan data lapangan, analisis data spektrum untuk pembuatan kurva dispersi kecepatan gelombang Rayleigh terhadap panjang gelombang dan proses inversi untuk membentuk kurva kecepatan gelombang geser terhadap kedalamannya. Dari hasil analisis pada profil kecepatan gelombang geser dan modulus elastisitas terhadap kedalamannya pada perkerasan jalan baru, jalan lama dan jalan yang telah dioverlay diperoleh nilai kecepatan gelombang geser masing masing 685,5146 m/dt, 777,1562 m/dt dan 832,0904 m/dt. Sedangkan nilai modulus elastisitas masing masing 2678,177 Mpa, 5123,997 Mpa dan 3765,418 Mpa.

References

Cho, Y.S dan Lin, F-B, 2001, Spectral analysis of surface wave response of multy layer thin cement mortar slab structure with finite element thickness, NDT International 34 (2001), Elsevier Science, pp. 115-122
Cho, Y.S. 2002. NDT Response of spectral analysis of surface wave method to multilayer thin high strength concretestructure, Ultrasonic 40: 227-230.
Curro,J.R. 1983. Cavity detection and delineation research. Technical Report GL-83-1.U.S. Army Waterways Experiment Station.
Dravinsky, M. 1983. Ground motion amplification due to elastic inclusions in a halfspace. Earthquake Engineering and Structural Dynamics 11:313-335.
Gucunski, N. Ganji, V.& Maher, M.H. 1996. Effect of soil non homogeneity on SASW testing. Geotechnical Special Publication, 58: 1083-1097
Haupt, A.W. 1977. Surface-waves in non homogeneous half-space. Proc. of the Conference on Dynamical Methods in Soil and Rock Mechanics. Vol. 1, hlm. 335-367.
Heisey, J. S., Stokoe II, K. H., and Meyer, A.H. (1982). “Moduli of Pavement System from Spectral Analysis of Surface Waves”. Transportation Research Record 852, p. 22-31.
Hvorslev, M.J., 1949. Subsurface exploration & sampling of soils for civil engineering purposes. Report on a Research Project of the Committee on Sampling and Testing Soil Mechanics and Foundations Division. Waterways Experimental Station.
Jones, R.B. 1958. In-situ measurement of thedynamic properties of soil by vibration methods. Geotechnique 8(1): 1-21.
Joh, S.H. 1996. Advance in interpretation & analysis technique for spectral analysis of surface wave (SASW) measurements. Disertasi Ph.D. The University of Texas at Austin.
Kim, D.-S., Shin, M.-K. & Park H.C. 2001. Evaluation of density in layer compaction using SASWmethod, SoilDynamic & Earthquake Engineering 21 : 39-46
Kramer, S.L. 1996. Geotechnical earthquake engineering. New Jersey: Prentice-Hall, Inc.653 pp.
Madshus, C. & Westerdahl, H. 1990. Surface wave measurementsfor construction control and maintenance planning of roads and airfields. Proc.of 3rd. Int. Conf. on Bearing Capacity of Roads and Airfields, hlm. 233-243.
Matthews, M.C. Hope, V.S. & Clayton, C.R.I. 1996. The geotechnical value of ground stiffness determined using seismic methods.Proc. of30th Annual Conference of the Engineering Group of the Geological Society, hlm. 1-13.
Nazarian, S. and Stokoe II, K. H. (1984). “In Situ Determination of Elastic Moduli of Pavement Systems by Spectral-AnalysisOf-Surface-Wave Method (Theoretical Aspects)”. Research Repot 437-2, Bureau of Engineering Research. Center of Transportation Research, The University of Texas at Austin.
Rix, G.J., Bay, J.A. & Stokoe II, K.H. 1990. Assessing in situ stiffness of curing Portland cement concrete with seismic tests. Transportation Research Record 1284: 8-15.
Rosyidi, S.A.P.J.N.N., Nayan, K.A.M, Taha, M.R. & Mustafa, M.M. 2002. Pengukuran sifat dinamik perkerasan lentur menggunakan metode Spectral-Analysis-of Surface-Wave SASW). Prosiding Simposium Forum Studi Transportasi antar Perguruan Tinggi V, hlm 1-12.
Rosyidi, S.A.P.J.N.N., & Taha, M.R. 2003. Use the shear wave velocity for predicting the stiffness of asphalt layer of pavementprofile. Konferensi Nasional Teknik Jalan ke-7, Jakarta.
Rosyidi, S.A.P.J.N.N. & Taha, M.R. 2004. Measurement of Pavement Moduli using
Simple Surface Wave Propagation Technique. Prosiding Simposium Forum
Studi Transportasi antar Perguruan Tinggi VII, hlm 1-10.
Rosyidi, S.A.P.J.N.N. 2004. Pengukuran Kekukuhan Dinamik Turapan Menggunakan SASW. Tesis Master. Universiti Kebangsaan Malaysia.
Stokoe II, K. H., Wright, S. G., Bay, J. A., and Roesset, J. M. (1994). “Characterization of Geotechnical Sites by SASW Method. Geotechnical Characterization of Sites”. R.D. Wood, Ed., Oxford and IBH Pub.Co., New Delhi, India, p. 15-26.
Terzaghi, K. 1943. Theoretical soil mechanics. New York: John & Wiley Sons.
Zagyapan, M. and Fairfield, C. A. (2002). “Continuous Surface Wave and Impact Methods of Measuring the Stiffness and Density of Railway Ballast”. NDT & E International, Vol. 35, p.75-81