Sains Malaysiana 38(1): 1-8 (2009)

 

 

Cirian Fiziko-Kimia dan Pengaruh ke atas Ketidakstabilan

Bahan Bumi Cerun di Kawasan Puchong, Selangor

(Physico-Chemical Properties and the Influence on Instability of Slope

Earth Materials in Puchong Area, Selangor)

 

 

Zulfahmi Ali Rahman*, Sahibin Abdul Rahim,

Jasni Yaakob**, Wan Mohd Razi Idris & Nai Chai Fong

Program Sains Sekitaran, Pusat Pengajian Sains Sekitaran dan Sumber Alam

Fakulti Sains dan Teknologi, Universiti Kebangsaan Malaysia

43600 UKM Bangi Selangor DE, Malaysia

 

**Institut Alam Sekitar dan Pembangunan (LESTARI)

Universiti Kebangsaan Malaysia, 43600 UKM Bangi Selangor DE, Malaysia

 

Diserahkan: 17 April 2008 / Diterima: 4 Jun 2008

 

 

ABSTRAK

 

Tinjauan sepanjang lebuhraya Puchong-Kajang telah dijalankan khususnya di kawasan Puchong, Selangor. Terdapat 12 stesen telah dilawati dan 6 daripadanya telah dilakukan pensampelan tanah bagi analisis makmal. Cerun-cerun yang terbabit dengan pensampelan ini melibatkan cerun jenis tanih dengan julat darjah luluhawa di antara gred IV dan VI. Sampel-sampel tanih yang diambil mewakili cerun yang mengalami kegagalan dan cerun yang stabil.  Ciri-ciri fiziko-kimia tanih yang dikaji melibatkan kandungan air segar dan dalam keadaan tepu, kandungan bahan organik, taburan saiz zarah, ketumpatan pukal dan sebenar, keporosan tanah, serakan liat, pH dan kandungan oksida ferum. Kandungan air tanah segar menunjukkan peratusan yang lebih tinggi pada cerun gagal berbanding cerun yang stabil. Semua sampel menunjukkan kandungan air tanah lapangan di bawah tahap kandungan air tepu. Kandungan bahan organik adalah sangat rendah (<2%) dan tanah boleh dikelaskan sebagai berpotensi tidak stabil. Terdapat hubungan positif yang jelas antara kandungan air dan bahan organik khususnya pada cerun gagal. Porositi tanah menunjukkan perkaitan positif terhadap lempung dan kandungan bahan organik. Kebanyakan tanah dikelaskan sebagai bertekstur lempung berpasir berbanding tekstur lain. Nilai-nilai koefisien serakan liat menunjukkan struktur tanah berada dalam kategori stabil hingga sangat stabil berbanding satu stesen yang dikelaskan sebagai tidak stabil. Secara umumnya, tanah terdiri daripada jenis asidik (pH4.87 - pH4.34) dengan kehadiran oksida ferum kurang daripada 6%.

Kata kunci: Kegagalan cerun; luluhawa; keporosan; ketumpatan; tekstur

 

ABSTRACT

A survey was carried along the Puchong-Kajang highway mainly in Puchong, Selangor. 12 stations were visited and soils samples were collected from six stations for laboratory analysis. The slopes for soil sampling are soil slope type with the grade of weathering from IV to VI. The soil samples were collected from stable and failed slopes. The physico-chemical properties of soil including of water content and water in the  saturated state, organic content, particle size distribution, bulk and true densities, porosity, clay dispersion, pH and iron oxide content. The water content showed higher percentage in failed slope than stable slope samples. All samples indicated that the field water content was below the saturated state. The organic contents were very low (<2%) and the soil can be classified as potentially unstable. A positive correlation was seen between water content and organic matter mainly for unstable slope. The porosity of soils showed a positive correlation with clay and organic matter. Most of the soils were classified as sandy clay. The coefficient values of clay fraction indicated that the soil structure confined in stable to very stable classes compared to one station classified as unstable. In general, the soils were acidic (pH4.87 - pH4.34) with the presence of iron oxide less of than 6%.

Keywords: Density; porosity; slope failure; weathering texture

 

 

REFERENCES/RUJUKAN

 

Abd Rashid Ahmad. 1996. The effect of physico-chemical characteristic of soil on slope stability. Prosiding Seminar Geologi dan Sekitaran: Impak dan Pengauditan: 244-259.

Acres, B. D., Bowen, R. P., Burrough, P. A., Folland, C. J., Kalsi, M. S., Thomas, P. & Wright, P. S. 1975. The soil of Sabah . Vol. I Classification and description (with introduction to Vol. 1-5). Land Resources Division, Ministry of Overseas Development Tolworth Tower , England .  

Auerswald, K., Kainz, M. & Fiener, P. 2003. Soil erosion potential of organic versus conventional farming evaluated by USLE modeling of cropping statistics for agricultural district in Bavaria. Soil Use Manage 19: 305-311.

Barthes, B., Albrecth, A., Asselina, J., De Noni, G. & Roose, E. 1999. Relationships between soil erodibiltiy and topsoil aggregation stability or carbon content in cultivated Mediterranian highland (Aveyron France ). Commun. Soil Sci. Plant and Anal. 30: 1929-1938.

Blesa, M. A., Moranda, P. J. & Regazzoni, A. E. 1994. Chemical dissolution of metal oxides. Florida: CRC Press.

Brady, N. C. & Weil, R. R.  2000. Elements of the nature and properties of soils. New Jersey: Prentice Hall.  

BST 1377. 1990. Standard method of for soils for civil engineering purposes. Part 3: Chemical and electro-chemical tests. London: British Standard Institution.

Dermott, W. 1967. Dispersion ratio determination according to Dermott West European Methods of Soil Structure Determinations VI 71.

Fookes, P. G. 1997. Tropical residual soils. London: The Geological Society.

Gobbett, D. J. & Hutchinson, C.S. 1973. Geology of the malay peninsula. New York: John Wiley & Sons.

Hamzah Mohamad. 1986. Perbandingan fasies metamorf Formasi Bukit Kenny dan Syis Dinding. Sains Malaysiana 15(1): 13-24.

Huat, B. B. 2008. Climate change impact on slope stability problem in Malaysia . Int. Seminar on Climate Variability, Change and Extreme Weather Events, 26-27 February 2008, UKM Bangi Malaysia : 39-40.

Ibrahim Komoo & Mogana, S. N. 1988. Physical characterization of weathering profile of classic metasediments in Peningsular Malaysia . Proceeds. 2nd Int. Conf. Geomech. In Tropical Soil 1: 37-42. 

Ibrahim Komoo & Jasni Yaakob. 1990. Engineering properties of weathered metamorphic rocks in Peningsular Malaysia. Proceeds. 6th Int. Assoc. Engng. Geol. Congress 1: 665-672.

Kez’di, A. 1974. Handbook of soil mechanics. Vol. I, Soil Physics. New York: Elsevier Publ. Co.

Leeper, G. W. 1964. Introduction to soil sciences. 4th ed. Australia, Melbourne : University Press.

Othman Yaacob & Shamshuddin Jusop. 1982. Sains tanah. Kuala Lumpur : Dewan Bahasa & Pustaka.

Roe, F. W. 1951. The geology and mineral resources of the Fraser’s Hill area, Selangor, Perak and Pahang Federation of Malaya with an account of the mineral resources. Geol. Survey Dept. Federation of Malaya, Memoir 5.

Stauffer, P. H. 1973. Kenny Hill formation: Geology of the malay peninsula. In: D.J. Gobbet and C.S. Hutchinson (editors). New York. John-Wiley Interscience.

Tejada, M. & Gonzalez, J. L. 2003. Effects of application of  a compost originating from crushed cotton gin residues on wheat yield under dryland conditions. Eur. J. Agron. 19: 357-368.

Toll, D. G. 2006. Landslide in Singapore : Technical note. Ground Engineering UK . April 2006: 35-36.

Zulfahmi, A. R. Sahibin, A. R & Jasni, Y. 1997.  Pemetaan taburan dan penilaian potensi kegagalan cerun kawasan Puchong dan sekitarnya. Laporan Akhir Penyelidikan, A/4/99 UKM (tidak diterbitkan).

Zulfahmi, A. R., Sahibin, A. R., Jasni, Y. & Wan Mohd Razi, I. 2007. Tinjauan awal potensi ketidakstabilan cerun dan cirian fiziko-kimia tanah di Cameron Highlands, Pahang. Sains Malaysiana 36(2): 105-116.

 

 

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