Sains Malaysiana 38(1): 21-30(2009)

Penilaian Kualiti Subgred Turapan Menggunakan

Kaedah Analisis Spektrum Gelombang Permukaan

(Evaluation of Pavement Subgrade Quality using the Spectral

Analysis of Surface Wave Method)

S. A. Rosyidi

Jabatan Kejuruteraan Awam, Universiti Muhammadiyah Yogyakarta

Jalan Lingkar Selatan, 55183 Yogyakarta, Indonesia

M. R. Taha*, A. Ismail & Z. Chik

Jabatan Kejuruteraan Awam dan Struktur

Fakulti Kejuruteraan, Universiti Kebangsaan Malaysia

Bangi 43600, Selangor, Malaysia

Diserahkan:  11 Mac 2008 / Diterima: 22 April 2008

ABSTRAK

Dalam hal yang berkaitan dengan pengurusan turapan jalan raya, keupayaan galas lapisan subgred banyak mempengaruhi keadaan struktur turapan secara keseluruhan.  Oleh itu, penilaian kualiti subgred diperlukan dari masa ke masa bagi mengawal kualiti turapan supaya ianya boleh dilalui kenderaan tanpa mengalami kerosakan.  Kaedah Analisis Spektrum Gelombang Permukaan (lebih dikenali dengan Spectral Analysis of Surface Wave-SASW) merupakan suatu teknik uji kaji seismos tanpa musnah di lapangan yang boleh digunakan untuk penilaian kekukuhan dan kedalaman struktur turapan jalan termasuk lapisan subgred turapan dengan cepat dan menjimatkan.  Makalah ini bertujuan untuk menunjukkan keupayaan kaedah SASW bagi menilai kualiti lapisan subgred turapan.  Kaedah SASW dilakukan berdasarkan kaedah perambatan gelombang R.  Berasaskan data beza fasa gelombang R yang merambat di permukaan turapan, lengkung eksperimen serakan halaju fasa diperolehi.  Selanjutnya melalui proses songsangan, parameter dinamik bahan seperti halaju ricih yang mewakili modulus elastik dan ricih dinamik bahan turapan jalan boleh ditentukan.  Hasil kajian menunjukkan bahawa kaedah SASW berupaya menghasilkan parameter dinamik bahan lapisan subgred turapan yang boleh diguna pakai.   Beberapa model empirik dengan korelasi yang baik berjaya diterbitkan daripada kajian ini yang boleh digunakan  dengan mudah  di lapangan untuk penilaian kekukuhan lapisan subgred secara tepat. 

Kata kunci: Kaedah SASW; kekukuhan turapan; kekukuhan subgred; pengurusan turapan

ABSTRACT

In highway pavement management, the bearing capacity of the subgrade layers have significant influence on the performance of the overall pavement structure.  Thus, the evaluation of subgrade quality is periodically needed for monitoring of  the quality of the pavement so that it can be passed by moving vehicles without damage.  The Spectral Analysis of Surface Wave-SASW, method is an in-situ non-destructive seismic testing method which is used for assessing the stiffness and the depth of road pavement structures including the subgrade layer in a fast and inexpensive manner.  The objective of this paper is to present the capability of the SASW method in the assessment of the quality of pavement subgrade layer.  The SASW method employed is based on the R-wave propagation.  Using the phase difference data of R-waves propagating in the surface of a pavement, the experimental dispersion curve of phase velocity is obtained.  Consequently, inversion process is conducted to obtain the dynamic elastic and shear modulus of the pavement structure.  The results showed that the SASW method was able to determine useful dynamic parameters for evaluation of the subgrade layer performance.  Empirical models with good correlations were also derived from this study which can be easily  used for  in situ evaluation of the subgrade layer stiffness.   

Keywords: SASW method; stiffness of pavement; subgrade stiffness; pavement management

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