Modelling of Swelling Parameters and Associated Characteristics Based on Index Properties of Expansive Soils

J. Israr, K. Farooq, H. H. Mujtaba

Abstract


Presence of swelling soils under the foundations of civil engineering structures particularly lightly loaded structures has caused serious damages around the globe due to their differential up heaving. In this paper, based on the results of swell tests on bentonite mixed clay, correlations for predicting the swelling parameters (i.e., swell potential and swell pressure) have been proposed. Mixing of bentonite into low swelling clay has imparted significant variations in its index properties including activity and plasticity index as well as in its swell potential and swell pressure values. Mixing of bentonite from 0 % to 55% into lean clay (CL) varies its placity index value from 18 to 150 resulting into variation of its activity from 0.62 to 1.87. For the same range of bentonite addition, the swell potential and swell pressure values vary from 2.62% to 12.16% and 94 kPa to 928 kPa, respectively. Based on multiple linear regression analysis of swell and index property test data, correlations between swelling parameters, activity and remolding moisture content for expansive soils have been developed. Experimental data of twenty six (26) swelling soils procured from various sites in Pakistan have been used to validate the proposed correlations. These correlations have predicted the swell potential and swell pressure of these soils within accuracy of +10% and +5%, respectively, in comparison with their experimentally determined values. A comparison of these predictions with couple of well-known published empirical equations has also been made.

Full Text:

PDF

References


American Society of Testing and Materials; Standard test method for laboratory compaction characteristics of soils using standard effort, Annual Book of Standards, ASTM-D698-07 2007b. West Conshohocken, Pennsylvania

Assadi and Shahaboddin; 2009. A micromechanical approach to swelling behavior of unsaturated expansive clays under controlled drainage conditions, Applied Clay Science, 45, 8–19.

Avsar, E., Ulusay, R. and Sonmez, H; 2009. Assessments of swelling anisotropy of Ankara clay, Engineering Geology 105, 24–31.

Basma, A. A; 1995. Cyclic Swelling behavior of clays, Geotechnical Engineering Journal, 121-7, 562-565.

Chen, F. H; 1975. Foundation on swelling soils, Development on Geotechnical Engineering 12. Elsevier Scientific Co, Amsterdam, 150-158.

Ene and Okagbuea; 2009. Some basic geotechnical properties of expansive soil modified using pyroclastic dust, Engineering Geology Journal, 107, 61-65.

Farooq, K; 1996. Engineering Characteristics of Expansive Soils in Pakistan, M.Sc. Thesis, University of Engineering and Technology, Lahore, Pakistan.

Ferber, V., Auriol, J.C., Cui, Y. J. and Magnan, J. P; 2009. On the swelling potential of compacted high plasticity clays, Engineering Geology Journal, 104-3, 200–210.

Holtz, W. G. and Gibbs, H. J; 1956. Engineering properties of swelling clays, Transaction ASCE, 121, 641–677.

Huang and Wu; 2007. Stability analysis of unsaturated expansive soil slope, Earth Science Frontiers 14-6, 129–133.

Israr, J; 2012. Development of correlations between index properties and swelling characteristics of swelling soils, M.Sc. Thesis, Department of Civil Engineering, University of Engineering and Technology Lahore, Pakistan.

Muntohar, A. S; 2000. Prediction and classification of swelling clay soil. (eds), Swelling soils recent advances in characterization and treatment, London, 25-36.

Okagbue; 1990. Expansive soils in engineering construction: a review of practices, Mining and Geology Journal, 2, 123–129.

Rashid, I., Farooq, K., Mujtaba, H., and Khan, A. H; 2013. Treatment of expansive clays through compaction control, Pakistan Journal of Science, 65-1, 103-107.

Shi, B., Jiang, H., Liu, Z., and Fang, H.Y; 2002. Engineering and geological characteristics of swelling soils in China, Engineering Geology Journal, Volume 67, 63–71.

Sridharan, A., Gurtug, Y; 2003. Swelling behaviour of compacted fine-grained soils, Engineering Geology Journal, 72, 9-18.






Copyright (c) 2016 J. Israr, K. Farooq, H. H. Mujtaba

Powered By KICS