Investigation of the correlation between California bearing ratio and shear strength of pavement subgrade material with different water contents

Year 2022, Volume: 3 Issue: 1, 1 - 7, 15.07.2022

Süleyman Gökova

https://doi.org/10.53635/jit.1097757

Cited By: 1

Abstract

In this study, CBR and Shear Vane tests, which are common test methods used in determining the bearing capacity and shear strength of the highway pavement subgrade material, were applied and the effect of the changing water content on the test results was investigated. It is aimed to determine the accuracy of these expressions by obtaining the bearing capacity parameters of the subgrade material with different water contents from laboratory experiments and comparing the results obtained with the empirical expressions in the literature. Shear strength and CBR values of five samples prepared at 15%, 16%, 17%, 18%, and 20% water contents were obtained experimentally. The experimental results obtained and the results calculated using the correlations found in the literature were compared. As a result of the study, the shear strength values obtained from the shear vane test, which is recommended to be preferred in terms of ease of application, were used in the selected correlation relations and CBR values were calculated. By comparing the experimental and calculated CBR values, the approximation accuracies of the existing correlation expressions were presented and it was seen that it was possible to find the CBR value with a maximum accuracy of 90%. In addition, this study presents a new correlation that gives the relationship between shear strength and CBR using the data obtained from the experimental results. With the new equation created; After the shear strength value was obtained experimentally, it was seen that the CBR value could be found with 96% accuracy.

Keywords

CBR, shear strength, hand vane shear tester, water content, correlations

References

• Brown, S. F., O'Reilly, M. P., & Loach, S. C. (1990). The relationship between California Bearing Ratio and elastic stiffness for compacted clays. Ground Engineering, 23(8).
• Frost, M. W., Fleming, P. R., & Rogers, C. D. (2004). Cyclic triaxial tests on clay subgrades for analytical pavement design. Journal of transportation Engineering, 130(3), 378-386. https://doi.org/10.1061/(ASCE)0733-947X(2004)130:3(378)
• Roy, T. K. (2013). Influence of sand on strength characteristics of cohesive soil for using as subgrade of road. Procedia-Social and Behavioral Sciences, 104, 218-224. https://doi.org/10.1016/j.sbspro.2013.11.114
• EL-Sherif, M. M., (1996). Correlation between California Bearing Ratio and Shear Strength Measurement of Soil. Engineering Research Journal, 47, 261-269.
• Kirkgard, M. M., & Lade, P. V. (1991). Anisotropy of normally consolidated San Francisco bay mud. ASTM International.
• Black, W. P. (1979). The strength of clay subgrades: its measurement by a penetrometer.
• Gregory, G. H., & Cross, S. A. (2007). Correlation of California bearing ratio with shear strength parameters. Transportation research record, 1989(1), 148-153. https://doi.org/10.3141%2F1989-17
• Giroud, J. P., & Han, J. (2004). Design method for geogrid-reinforced unpaved roads. II. Calibration and applications. Journal of Geotechnical and Geoenvironmental Engineering, 130(8), 787-797. https://doi.org/10.1061/(ASCE)1090-0241(2004)130:8(787)
• Black, W. P. M. (1962). A method of estimating the California bearing ratio of cohesive soils from plasticity data. Geotechnique, 12(4), 271-282. https://doi.org/10.1680/geot.1962.12.4.271
• Purwana, Y. M., & Nikraz, H. (2014). The correlation between the CBR and shear strength in unsaturated soil conditions. International Journal of Transportation Engineering, 1(3), 211-222. https://dx.doi.org/10.22119/ijte.2014.4790
• Reddy, S., Ruchita, N., Sharma, P. & Satyanarayana, S.V. (2019). Prediction of California Bearing Ratio through Empirical Correlations of Index Properties for Tropical Indian Soils. International Journal of Innovations in Engineering and Technology, 15(1), 67-77. http://dx.doi.org/10.21172/ijiet.151.09
• Razouki, S. S., Kuttah, D. K., Al-Damluji, O. A., & Nashat, I. H. (2005). Strong correlation between the bearing capacity and CBR of a gypsiferous subgrade soil subjected to long-term soaking. In Proceedings of the international conferences on the bearing capacity of roads, railways and airfields.
• Narzary, B. K., & Ahamad, K. U. (2018). Estimating elastic modulus of California bearing ratio test sample using finite element model. Construction and Building Materials, 175, 601-609. https://doi.org/10.1016/j.conbuildmat.2018.04.228
• Joseph, D., & Vipulanandan, C. (2010). Correlation between California bearing ratio (CBR) and soil parameters. J. CIGMAT. Geotechnical Research, 31, 44-9.
• Shimobe, S., & Spagnoli, G. (2020). Relationships between undrained shear strength, liquidity index, and water content ratio of clays. Bulletin of Engineering Geology and the Environment, 79(9), 4817-4828. https://doi.org/10.1007/s10064-020-01844-5
• Rushema, B. W. (2021). Examination of the Correlation between Shear Strength, California Bearing Ratio, and Index Properties of Fine-grained Soil. Master of Science in Civil Engineering Theses, Kennesaw State University, Georgia, USA
• Caicedo, B., & Mendoza, C. (2015). Geotechnical behaviour of unpaved roads: understanding the CBR test. From Fundamentals to Applications in Geotechnics, 95-100. https://doi.org/10.3233/978-1-61499-603-3-95
• Şeker, V., & Selçuk, L. (2018). Kaliforniya taşıma oranının laboratuvar değerlerinin belirlenmesinde P-dalga hızının kullanılabilirliği. 71. Türkiye Jeoloji Kurultayı.
• Ullah, A. (2017). Application of vane shear tools to assess the shear strength of remolded clay soil. Research Journal of Engineering, 6(1), 1-4.
• Arslan, E., Düzen, İ., Develioglu, I., & Pulat, H. F. (2021). Undrained shear strength of polypropylene fiber reinforced alluvial clay. Environmental Research and Technology, 4(3), 219-229. https://doi.org/10.35208/ert.903408
• Ayadat, T. (2021). Determination of the Undrained Shear Strength of Sensitive Clay Using Some Laboratory Soil Data. Studies in Engineering and Technology, 8(1), 14-27. https://doi.org/10.11114/set.v8i1.5149