Expansive Soils Characterizations and Their Destructive Effects on Tabriz Northern Highway, Iran
Nowadays, expansive or swelling soils considered as a worldwide issue which poses several challenges to geotechnical engineers. Expansive soils are classified as a high-plasticity fine grained soils which mainly consists of clay minerals. This paper is intended to investigate the expansive soils characterizations along Tabriz Northern Highway (TNH) and their destructive effects. TNH with length of 17 km is constructed about 10 years ago. Geology formation of TNH and its around is consisted of different layers of mudstone, marlstone, and sandstone. The expansive soils formation is result of weathering of these rock layers. There are some challenges for TNH pavement such as: longitudinal and transverse fractures and cracks, the distortion and settlement of surface which is cause many accidents. Field studies are shown that the main reasons of TNH pavement problems are soil swelling and settlement of fill soils below pavement. For investigation of swelling characterization of soils, some samples were obtained and tested in laboratory. The test results indicate that the unified classifications of soils are mostly CL and clay material of soils is about 30%. Plasticity index of soils is placed between 7 and 23%. Swelling potential of soils along TNH is evaluated low to medium. In order to ground treatment, soil-cement is placed under road using the local soil material.
KeywordsExpansive soil Tabriz Northern Highway (TNH) Atterberg limits
The authors would like to thank Mr. Zohdi, Pazhoohesh Omran Rahvar Company, and Khak-Ab Tahlil Company for giving information.
- 1.Caunce, C.M.: Effective road pavement design for expansive soils in Ipswich. Bachelor of Engineering (Civil). University of Southern Queensland, pp. 15–18 (2010)Google Scholar
- 2.Firoozi, A.A., Firoozi, A.A., Baghini, M.S.: A review of physical and chemical clayey. J. Civ. Eng. Urbanism 4(6), 64–71 (2016)Google Scholar
- 5.Zumrawi, M.M.E.: Performance and design of expansive soils as road subgrade. Ph.D. thesis. Chang’an University China, pp. 16–17 (2000)Google Scholar
- 6.Peck, R.B., Hanson, W.E., Thornburn, T.H.: Foundation Engineering, 2nd edn. Wiley, New York (1974)Google Scholar
- 7.Zapata, C.E., Houston, S.L., Houston, W.N., Dye, H.: Expansion index and its relationship with other index properties. In: Proceeding of the 4th International Conference on Unsaturated Soils, Carefree, AZ, pp. 2133–2137 (2006)Google Scholar
- 8.Skempton, A.W.: The colloidal activity of clays. In: Proceedings of the 3rd International Conference on soil Mechanics and Foundation Engineering, Switzerland, pp. 57–61 (1953)Google Scholar
- 9.Seed, H.B., Woodward, R.J., Lundgren, R.: Prediction of swelling potential for compacted clays. J. Soil Mech. Found. Div. 88(3), 53–87 (1962)Google Scholar
- 10.Marei, N., Abdel-Motaleb, A., Elashaal, A.: Improvement of expansive soil in waterways using different replacement cushions. J. Egypt. Geotech. Soc. 11, 1–10 (2000)Google Scholar
- 13.ASTM D4318: Standard test methods for liquid limit, plastic limit, and plasticity index of soils, West Conshohocken (2010)Google Scholar
- 14.ASTM D4943: Standard test methods for shrinkage factors of soils by the Wax method, West Conshohocken (2002)Google Scholar
- 15.ASTM D422: Standard test methods for particle-size analysis of soils, West Conshohocken (2007)Google Scholar
- 17.Casagrande, A.: Classification and identification of soils. ASCE, pp. 783–810 (1948)Google Scholar