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
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