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Presentation of Empirical Equations for Estimating Internal Friction Angle of GW and GC Soils in Mashhad, Iran Using Standard Penetration and Direct Shear Tests and Comparison with Previous Equations

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DOI: 10.4236/ojg.2015.55021    4,776 Downloads   5,681 Views   Citations


Presentation of empirical equations for estimating engineering properties of soils is a simple, low cost and widely-used method. One of the major concerns in using these equations is evaluating their accuracy in different conditions and regions which often lead to doubts about obtained results. Most of these equations were derived in special laboratories, different climate conditions and in soils with different geotechnical and geological engineering properties and were generalized to other conditions. The main question is that whether these methods are also applicable to other conditions. Using local equations and narrowing the usage range of various methods based on each region’s properties are appropriate methods to solve these problems. This leads to simplified and faster analysis and high reliability in the obtained results. In this paper, empirical equations were derived to estimate internal friction angle, based on SPT numbers of Mashhad City’s soils in Iran, using SPT and direct shear tests results from 50 samples (25 GW and 25 GC soil samples). The results showed similar values for predicted φ values by SPT test and φ values determined by direct shear tests.

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The authors declare no conflicts of interest.

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Salari, P. , Lashkaripour, G. and Ghafoori, M. (2015) Presentation of Empirical Equations for Estimating Internal Friction Angle of GW and GC Soils in Mashhad, Iran Using Standard Penetration and Direct Shear Tests and Comparison with Previous Equations. Open Journal of Geology, 5, 231-238. doi: 10.4236/ojg.2015.55021.


[1] McGregor, J. and Duncan, J.M. (1998) Performance and Use of the Standard Penetration Test in Geotechnical Engineering Practice. Report of CGPR, Virginia Polytechnic Institute, Blacksburg.
[2] Shioi, Y. and Fukui, J. (1982) Application of N-Value to Design of Foundation in Japan. 2nd ESOPT, Vol. 1, 40-93.
[3] Silva, S.D., Wightman, E.N.R. and Kamruzzaman, M. (2010) Geotechnical Ground Investigation for the Padmamain Bridge. In: Amin, Okui, Bhuiyan, Eds., IABCE-JSCE Joint Conference on Advances in Bridge Engineering-II, Dhaka, Bangladesh, 8-10 August 2010, 427-436.
[4] Hettiarachchi, H. and Brown, T. (2009) Use of SPT Blow Counts to Estimate Shear Strength Properties of Soils: Energy Balance Approach, Journal of Geotechnical and Geoenvironmental Engineering, 135, 25-32.
[5] Jianguo, C. (2012) Correlation Analysis of SPT N Values and Cohesion and Internal Angle of a Clay. Soil Engineering and Foundation, 26, 91-93.
[6] Kaliniski, M. (2011) Soil Mechanics Lab Manual. 2nd Edition, John Wiley & Sons, Inc., Hoboken.
[7] Mohammad, M. (2013) Reliability of Standard Penetration Test (SPT) in Predicting Properties of Silty Clay with Sand Soil. International Journal of Civil and Structural Engineering, 3, 85-94.
[8] Bowles, J.E. (1988) Foundation Analysis and Design. 4th Edition, McGraw Hill.
[9] Budhu, M. (2011) Soil Mechanics and Foundation. 3rd Edition, John Wiley & Sons, Inc., Hoboken.
[10] FHWAO-IF-03-17 (2003) Geotechnical Engineering Circular, No.3, Soil Nail Walls.
[11] Aggour, M.S. and Radding, W.R. (2001) Standard Penetration Test (SPT) Correction. Research Report, Civil and Environmental Engineering Department, University of Maryland College Park, Maryland, 20742.
[12] Soil and Structure Consulting Engineers Company (2014) Geotechnical Reports of Vakilabad Region Projects.
[13] Rad, M. (2008) Engineering Statistics and Probabilities. Publications of Hafiz and Tafresh University, Tafresh.
[14] Isotalo, J. (2001) Basics of Statistics. University of Tampere, Tampere.

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