TRANSACTION PAPER

Estimating the modulus of elasticity of the rock material from compressive strength and unit weight

I. Ocak

Istanbul Metropolitan Municipality and Istanbul University, Mining Engineering Department, Istanbul, Turkey

SYNOPSIS

The modulus of elasticity of rock material (Ei) is an important rock property that is used as an input parameter in the design stage of engineering projects such as dam and tunnel constructions, mining excavations, and so forth. However, determination of the modulus of elasticity is sometimes difficult to obtain by laboratory tests because high-quality cores are required. For this reason, empirical methods for predicting the modulus of elasticity of rock material have been popular research topics in recently published literature. In this study, the relationships between the uniaxial compressive strength (UCS), unit weight (y) and modulus of elasticity for different types of rocks were analysed by using 177 data obtained from laboratory tests carried out on cores obtained from drill holes within the area of the Kadıköy-Kartal Metro line (Istanbul, Turkey).

Keywords: Kadikoy-Kartal Metro, uniaxial compressive strength, unit weight, estimating the modulus of elasticity

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References

AUFMUTH, R.E. A systematic determination of engineering 20 criteria for rock. Bull. of Assoc. of Engineering Geology, vol. 11, 1973. pp. 235-245.         [ Links ]

DEERE, D.V. and MILLER, R.L. Engineering Classification and Index Properties of Intact Rock, Department of Civil Engineering, University of Illinois, 1966. pp. 90-101.         [ Links ]

ISRM. International Society for Rock Mechanics Suggested Methods: Rock Characterization., Testing and monitoring, E.T. Brown (ed.), Permagon Presss, London. 1981.         [ Links ]

IBB. Istanbul Metropolitan Municipality, IETT General Directorate, Kadikoy-Kartal Metro Project Geotechnical Report. 2005a.         [ Links ]

IBB. Istanbul Metropolitan Municipality, IETT General Directorate, Engineering Geology Report,. The Project of the Istanbul Kadikoy-Kartal Rail Transport System. 2005b.         [ Links ]

LASHKARIPOUR, G.R. and NAKHAEI, M. A Statistical Investigation on Mudrocks Characteristics. Rock Mechanics, 2001. pp. 131-136.         [ Links ]

PALCHIK V. Influence of Porosity and Elastic Modulus on Uniaxial Compressive Strength in Soft Brittle Porous Sandstones, Rock Mechanic and Rock Engineering, vol. 32, no. 4, 1999. pp. 303-309.         [ Links ]

ROHDE, J. and FENG, H. Ana1ysis of the Variability of Unconfined Compression Tests of Rock, Rock Mechanic and Rock Engineering, vol. 23, 1990. pp. 231-236.         [ Links ]

SACHPAZIS, C.I. Correlating Schmidt Hardness with Compressive Strength and Young's Modulus of Carbonate Rocks, Bull. Int. Assoc. Eng. Geol. vol. 42, 1990. pp. 75-83.         [ Links ]

SÖNMEZ, H., GÖKÇEOĞLU, C., KASAPOĞLU, K.E., TUNCAY, E., and ZORLU, K. An empirical equation for estimating elasticity modulus of intack rock. Rockmec VIIth, Regional Rock Mechanics Symposium, Sivas-Turkey. 2004a.         [ Links ]

SÖNMEZ, H., TUNCAY, E., and GÖKÇEOĞLU, C. Models to predict the uniaxial compressive strength and the modulus of elasticity for Ankara agglomerate, International Journal of Rock Mechanics & Mining Sciences, vol. 41, 2004b. pp. 717-729.         [ Links ]

SONMEZ, H., GOKCEOGLU, C., KAYABAS, A., and NEFESLIOGLU, H.A. Estimation of rock modulus: for intact rocks with an artificial neural network and for rock masses with a new empirical equation, International Journal of Rock Mechanics & Mining Sciences, vol. 43, no. 2, 2006. pp. 224-235.         [ Links ]

TUĞRUL, A. and ZARIF, I.H. Correlation of mineralogical and textural characteristics with engineering properties o selected granitic rock from Turkey, Engineering Geology, vol. 51, 1999. pp. 303-317.         [ Links ]

XU S., GRASSO, P., and MAHTAB A. Use of schmidt hammer for estimating mechanical properties of weak rock. 6th International IAEG Congress, 1990. pp. 511-519.         [ Links ]