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

 

 

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*Pengaran untuk surat menyurat