Soil moisture retention characteristics of saprock in a weathering profile over rhyolite in Peninsular Malaysia

Warta Geologi 49 No 2
Author : John Kuna Raj
Publication : Warta Geologi
Page : 55-63
Volume Number : 49
Year : 2023
DOI : doi.org/10.7186/wg492202302

Warta Geologi, Vol. 49, No. 2, August 2023, pp. 55–63

Soil moisture retention characteristics of saprock in a weathering profile over rhyolite in Peninsular Malaysia

John Kuna Raj
No. 83, Jalan Burhanuddin Helmi 2, Taman Tun Dr. Ismail, 60000 Kuala Lumpur, Malaysia
Email address: jkr.ttdi.tmc@gmail.com

Abstract: Three broad zones can be differentiated at the weathering profile; an upper 3.9 m thick pedological soil (zone I), an intermediate 21.4 m thick saprock (zone II), and the underlying bedrock (zone III). To determine the soil moisture retention characteristics of saprock, samples were collected at vertical depths of 5.7 m (sample A), 9.1 m (sample B), 12.7 m (sample C) and 16.9 m (sample D). Samples A and B with porosities of 39% and 48%, had 7% and 6% gravel fractions, 48% and 57% sand fractions, 32% and 30% silt fractions, and 13% and 7% clay fractions, respectively. Samples C and D with similar porosities of 46%, had 6% and 17% gravel fractions, 56% and 45% sand fractions, 32% silt fractions, and 6% clay fractions, respectively. Laboratory determinations employing the pressure plate method show increasing suctions from 0 kPa through 0.98 kPa and 9.8 kPa to 33 kPa and 1,500 kPa to result in gravimetric soil moisture retentions of 28.3% through 24.0% and 19.2% to 15.0% and 5.7% for sample A, and from 21.7% through 21.1% and 17.8% to 11.9% and 3.8% for sample B. Similarly increasing auctions yield gravimetric soil moisture retentions of 28.3% through 34.7% and 29.1% to 23.2% and 7.0% for sample C, and from 28.4% to 28.1% and 23.4% to 18.6% and 5.0% for sample D. Regression analyses of gravel, sand and clay fractions plotted against moisture contents retained at large suctions (33 kPa and 1500 kPa) yield variable trends with low correlation coefficients (R2<0.179), though plots involving silt contents yield positive trends with larger correlation coefficients (R2 >0.525). It is concluded that the adsorption of water on the surfaces of silt particles that most likely results in retention of soil moisture by saprock.

Keywords: Rhyolite, weathering profile, saprock, soil moisture retention, silt content

 

REFERENCES

Agus, S.S., Leong, E.C. & Rahardjo, H., 2001. Soil-water characteristic curves of Singapore residual soils. Geotechnical & Geological Engineering, 19, 285-309.

ASTM, American Society for Testing Materials, 1970. Special procedures for testing soil and rock for engineering purposes. Special Publication 479. American Society for Testing Materials, Philadelphia. 630 p.

Azman, A.G. & Singh, N., 2005. Petrology and geochemistry of the Sempah Volcanic Complex. Bulletin of the Geological Society of Malaysia, 51, 103-121.

Bujang, B.K.H., Faisal Hj. Ali & Hashim, S., 2005a. Modified shear box test apparatus for measuring shear strength of unsaturated residual soil. American Journal of Applied Sciences, 2(9), 1283-1289.

Bujang, B.K.H., Faisal Hj. Ali & Affendi Abdullah, 2005b. Response of suction, moisture and temperature of unsaturated residual soil to rainfall. Electronic Journal of Geotechnical Engineering (EJGE), 10, D, Paper 2005-0545.

Chakraborty, K.R., 1995. Genting Sempah Volcanic Complex: Genetic implications for the Main Range Granite. Warta Geologi, 21, 216-217.

Cobbing, E.J. & Mallick, D.I.J., 1987. Southeast Asia Granite Project – Field Report for Peninsular Malaysia. Overseas Directorate, British Geological Survey, Report No. MP/87/19R. 29 p.

Faisal, H.A., Bujang, B.K.H. & Low, T.H., 2005. Infiltration characteristics of granitic residual soil of various weathering grades. American Journal of Environmental Sciences, 1(1), 64-68.

FAO, Food and Agricultural Organization, 2006. Guidelines for soil description, 4th edition. Food and Agriculture Organization of the United Nations, Rome. 109 p.

Haile, N.S., Stauffer, P.H., Krishnan, D., Lim, T.P. & Ong, G.B., 1977. Palaeozoic redbeds and radiolarian cherts: reinterpretation of their relationships in the Bentong and Raub areas, West Pahang, Peninsular Malaysia. Bulletin of the Geological Society of Malaysia, 8, 45-60.

Hamdan, J., Ching, L.B. & Ruhana, B., 2006. Saturated hydraulic conductivity of some saprolites from Peninsular Malaysia. Malaysian Journal of Soil Science, 10, 13-24.

JKR, Public Works Department of Malaysia, 2007. Guidelines for hard material/rock excavation. Technical Note (Roads) 24/05. Road Division, Jabatan Kerja Raya Malaysia, Kuala Lumpur. 15 p.

Leamy M.L. & Panton, W.P., 1966. Soil survey manual for Malayan conditions. Division of Agriculture, Malaysia. 22 p.

Liew, T.C., 1977. Petrology and structural relationships of rhyolitic rocks and micro-granodiorite, east of Genting Sempah, Pahang. B.Sc. (Hons) Thesis, Department of Geology, University of Malaya, Kuala Lumpur. 80 p.

Liew, T.C. & Page, R.W., 1985. U-Pb zircon dating of granitoid plutons from the West Coast Province of Peninsular Malaysia. Journal Geological Society, 142, 525-626.

Lu, N., 2016. Generalized soil water retention equation for adsorption and capillarity. Journal of Geotechnical & Geoenvironmental Engineering, 142, 10, 1-15.

Lumb, P., 1975. Slope failures in Hong Kong. Quarterly Journal Engineering Geology, 8, 31-36.

Poppe, L.J., Paskevich, V.F., Hathaway, J.C. & Blackwood, B.S., 2001. A laboratory manual for X-ray powder diffraction. United States Geological Survey Open-File Report 01- 041, 88 p.

Raj, J.K., 1983. A study of residual soils and their cut slope stability in selected areas of Peninsular Malaysia. Ph.D. Thesis, Faculty of Science, University of Malaya, Kuala Lumpur. 462 p.

Raj, J.K., 1985. Characterization of the weathering profile developed over a porphyritic biotite granite bedrock in Peninsular Malaysia. Bulletin International Association of Engineering Geology, 32, 121-128.

Raj, J.K., 2000. Rainfall and slope failures in the granitic bedrock areas of Peninsular Malaysia. Proceedings Annual Conference 2000, Penang, Geological Society of Malaysia, 275-282.

Raj, J.K., 2009. Geomorphology. In: Hutchison, C.S. & Tan, D.N.K. (Eds.), Geology of Peninsular Malaysia. University of Malaya and Geological Society of Malaysia, Kuala Lumpur, 5-19.

Raj, J.K., 2010. Soil moisture retention characteristics of earth materials in the weathering profile over a porphyritic biotite granite in Peninsular Malaysia. American Journal of Geosciences, 1(1), 12-20.

Raj, J.K., 2018. Physical characterization of a deep weathering profile over rhyolite in humid tropical Peninsular Malaysia. Geotechnical & Geological Engineering, 36(6), 3793-3809.

Raj, J.K., 2021. Soil moisture retention characteristics of saprock from the weathering profile over a biotite-muscovite granite in Peninsular Malaysia. Warta Geologi, 47(3), 217-225.

Scherer, T.F., B. Seelig & Franzen, D., 1996. Soil, water and plant characteristics important to irrigation. EB-66, www. ag.ndsu.edu/pubs/ageng/ irrigate/eb66w.htm.

Singh, N. & Azman, A.G., 2000. Sempah volcanic complex, Pahang. In: Teh, G.H., Pereira, J.J. & Ng, T.F. (Eds.), Proceedings Annual Conference 2000, Penang, Geological Society of Malaysia, 67-72.

Thamer, A.M., Faisal Hj. Ali, S. Hashim & Bujang, B.K.H., 2006. Relationship between shear strength and soil water characteristic curve of an unsaturated granitic residual soil. American Journal of Environmental Sciences, 2(4), 142-145.

Thorez, J., 1975. Phyllosilicates and clay minerals – A laboratory handbook for their X-ray diffraction analysis. G. Lelotte, Belgium. 582 p.

USBR, United States Bureau of Reclamation, 1974. Earth Manual. United States Government Printing Office, Washington, 810 p.

Vanapalli, S.K., Fredlund, D.G., Pufahi, D.E. & Clifton, A.W., 1996. Model for the prediction of shear strength with respect to soil suction. Canadian Geotechnical Journal, 33, 379-392.

Wentworth, C.K., 1922. A scale for grade and class terms for clastic sediments. Journal of Geology, 30, 377-392.

 

Manuscript received 17 March 2023;
Received in revised form 20 May 2023;
Accepted 20 May 2023
Available online 30 August 2023

DOI : https://doi.org/10.7186/wg492202302

0126-5539; 2682-7549

Published by the Geological Society of Malaysia.
© 2023 by the Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution (CC-BY) License 4.0