Fuenkajorn, K 2008, 'Prediction of Long-Term Strength of Some Weak Rocks in Thailand', in Y Potvin, J Carter, A Dyskin & R Jeffrey (eds), SHIRMS 2008: Proceedings of the First Southern Hemisphere International Rock Mechanics Symposium
, Australian Centre for Geomechanics, Perth, pp. 157-168, https://doi.org/10.36487/ACG_repo/808_63
A series of slake durability tests, point load strength index tests, tilt tests and x-ray diffraction analyses were carried out on thirteen rock types, in an attempt to correlate the rock durability with their strengths and mineral compositions. A concept was proposed to describe the rock degradation characteristics under the slake durability test cycles. A new classification system was also introduced for rock durability, which allowed predicting the rock strength as affected by weathering process. Results indicated that Pichit pumice breccia, Phra Wihan siltstone, Phu Kradung sandstone, Khok Kruat sandstone and Chonburi schist are classified as low to very low durability rocks, primarily due to the kaolinite content. Nam Duk slaty-shale is considered high durability, not sensitive to water, but is easily disintegrated by rapid change of surrounding temperatures. The point load strength index decreases with an increasing difference in slake durability indices obtained from adjacent cycles (ΔSDI). Basic friction angles of the smooth (saw-cut) surfaces of the rocks decrease as the rapid heating-cooling cycles increase.
ASTM C127 (1998) Standard test method for density, relative density (specific gravity), and absorption of coarse aggregate. Annual Book of ASTM Standards, Vol. 04.08 American Society for Testing and Materials, Philadelphia, PA.
ASTM D4644 (1998) Standard test method for slake durability of shale and similar weak rocks. Annual Book of ASTM Standards, Vol. 04.08. American Society for Testing and Materials, Philadelphia, PA.
ASTM D5731 (1998) Standard test method for determination of the point load strength index of rock. Annual Book of ASTM Standards, Vol. 04.08, American Society for Testing and Materials, Philadelphia, PA.
Brown, E.T. (1981) Rock characterization testing and monitoring ISRM suggested methods. 1st edition Pergamon Press, Oxford, UK, 211 p.
Dhakal, G., Yoneda, T., Kata, Y. and Kaneko, K. (2002) Slake durability and mineralogical properties of some pyroclastic and sedimentary rocks. Eng. Geo., 65(1), pp. 31–45.
Fang, Z. and Harrison, J.P. (2001) A mechanical degradation index for rock. Int. J. Rock Mech. Min., Vol. 38(8), pp. 1193–1199.
Gokceoglu, C., Ulusay, R. and Sonmez, H. (2000) Factors affecting the durability of selected weak and clay-bearing rocks from Turkey, with particular emphasis on the influence of the number of drying and wetting cycles. Engineering Geology, Vol. 57(1), pp. 215–237.
Gupta, A.S. and Seshagiri, K.R. (2000) Weathering effect on the strength and deformational behavior of crystalline rocks under uniaxial compression state. Eng. Geo., Vol. 56(3–4). pp. 257–274.
Koncagul, E.C. and Santi, P.M. (1999) Predicting the unconfined compressive strength of the Breathitt shale using slake durability, Shore hardness and rock structural properties. Int. J. Rock Mech. Min., 36(2). pp. 139–153.
Oguchi, C.T. and Matsukura, Y. (1999) Effect of porosity on the increase in weathering-rind thickness of andesite gravel. Eng. Geo., 55(1–2), pp. 77–89.
Oyama, T. and Chigira, M. (1999) Weathering rate of mudstone and tuff on old unlined tunnel walls. Eng. Geo., Vol. 5(1–2), pp. 15–27.
Phienwej, N. and Singh, V.K. (2005) Engineering properties of rocks of Phu Kadung and Phra Wihan formations in Northeast Thailand. Proceedings International Symposium-GEOINDO 2005, November, 28–30, Khon Kaen, Thailand, pp. 199–204.
Richard, E.S., Claus, B. and Gordon, J.V.W. (1998) Fundamentals of Thermodynamics. New York. John Wiley and Sons, Inc, NY., 783 p.
Robinson, D.A. and Williams, R.B.G. (1994) Rock Weathering and Landform Evolution. New York. John Wiley and Sons, Inc, NY., 519 p.
Sousa, L.M.O., Suarez del Rio, L.M. and Calleja, L. (2005) Influence of microfractures and porosity on the physico-mechanical properties and weathering of ornamental granites. Eng. Geo., 77(1–2), pp. 153–168.
Tugrul, A. (2004) The effect of weathering on pore geometry and compressive strength of selected rock types from Turkey. Eng. Geo., 75(3–4), pp. 215–227.