ENGINEERING JOURNAL : KARAKTERISASI PROFIL TANAH DENGAN MENGGUNAKAN ANALISA KURVA DISPERSI. (Studi Kasus: Kampus Geomatika FTSP ITS Surabaya)

Jurnal Rekayasa Vol 6 No 2 Artikel 02

Hisbulloh Huda
(Program Studi Geofisika Jurusan FISIKA FMIPA ITS Surabaya, e-mail: hihuda@physics.its.ac.id)
Bagus Jaya Santosa
(Program Studi Geofisika Jurusan FISIKA FMIPA ITS Surabaya, e-mail: bjs@physics.its.ac.id)

ABSTRACT: Has been executed research about seismic exploration method of refraction, by exploiting Pile at development project at 2nd Geomatic Campus of FTSP ITS Surabaya as trill source. Rayleigh wave is one of type from good surface wave applied to identify layer sewer structures near by ground equiamplitude surface, because 67% total dissociation energy of diatomic discharged by source of seismic wave is transmission in the form of Rayleigh wave.At laminated medium of Rayleigh wave has property dispersif, speed as frequency function. This property applicable to determine ground layer sewer structures based on shift wave velocity ( Vs) to depth ( h). Inversion process done to get adaptation between gauging dispersion curves with model.Result of inversion process is shift wave velocity ( Vs) as function of depth. This research in expecting can identify and mengkarakterisation of profile tanahdi location of research.Based on result of Estimasi speed of shift as function of depth is done by the way of dispersion curve inversion of all proximate geophone couple. Result of all estimation of this shift wave velocity express sewer structures under equiamplitude surface between both geophone. interpretation of geology mentions , that depth of 1 meter at point 2,5 meter until point 45 meter and at point 52,5 meter in the form of Clay rock pasiran and at point 47,5 meter in the form of sand rock. ampai firm soil;land;ground ( value SPT > 50). While SPT with approach of Clay it is known that soil layer is of all [by] point ( except around [by] point 47,5 m ) including at slack soil;land;ground. From both this estimations got equality of criterion at point 2,5 m to 37,5 m namely rock is including at slack rock.

Keywords : Soil profile, dispersion analysis, Rayleigh wave

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