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http://dx.doi.org/10.12989/gae.2015.8.1.113

Improvement of bearing capacity of footing on soft clay grouted with lime-silica fume mix  

Fattah, Mohammed Y. (Building and Construction Engineering Department, University of Technology Baghdad)
Al-Saidi, A'amal A. (Department of Civil Engineering, College of Engineering, University of Baghdad)
Jaber, Maher M. (Department of Civil Engineering, College of Engineering, University of Baghdad)
Publication Information
Geomechanics and Engineering / v.8, no.1, 2015 , pp. 113-132 More about this Journal
Abstract
In this study, lime (L), silica fume (SF), and lime-silica fume (L-SF) mix have been used for stabilizing and considering their effects on the soft clay soil. The improvement technique adopted in this study includes improving the behaviour, of a square footing over soft clay through grouting the clay with a slurry of lime-silica fume before and after installation of the footing. A grey-colored densified silica fume is used. Three percentages are used for lime (2%, 4% and 6%) and three percentages are used for silica fume (2.5%, 5%, 10%) and the optimum percentage of silica fume is mixed with the percentages of lime. Several tests are made to investigate the soil behaviour after adding the limeand silica fume. For grouting the soft clay underneath and around the footing, a 60 ml needle was used as a liquid tank of the lime-silica fume mix. Slurried silica fume typically contains 40 to 60% silica fume by mass. Four categories were studied to stabilize soft clay before and after footing construction and for each category, the effectiveness of grouting was investigated; the effect of injection hole spacing and depth of grout was investigated too. It was found that when the soft clay underneath or around a footing is injected by a slurry of lime-silica fume, an increase in the bearing capacity in the range of (6.58-88)% is obtained. The footing bearing capacity increases with increase of depth of grouting holes around the footing area due to increase in L-SF grout. The grouting near the footing to a distance of 0.5 B is more effective than grouting at a distance of 1.0 B due to shape of shear failure of soft clay around the footing.
Keywords
soft clay; stabilization; lime-silica fume; grouting;
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  • Reference
1 Marto, A., Oghabi, M. and Eisazadeh, M. (2013), "Effect of Geocell reinforcement in sand and its effect on the bearing capacity with experimental test; A review", Electr. J. Geotech. Eng., 18(Bund, Q.), 3501-3516.
2 Ni, J. and Wen, C.C. (2009), "Grout efficiency of lifting structure in soft clay", GeoHunan International Conference on Challenges and Recent Advance in Pavement Technologies and Transportation Geotechnics, Hunan, China, August.
3 Rogers, C.D., Boardman, D.I. and Papadimitriou, G. (2006), "Stress path testing of realistically cured lime and lime/cement stabilized clay", J. Mater. Civil Eng., ASCE, 18(2), 259-266.   DOI
4 Terzaghi, K. (1943), Theoretical Soil Mechanics, John Wily & Sons, NewYork, NY, USA.
5 Terzaghi, K. and Peck, R.B. (1967), Soil Mechanics in Engineering Practice, (2nd Edition), John Wiley & Sons, New York, NY, USA.
6 Vichan, S., Rachan, R. and Horpibulsuk, S. (2013), "Strength and microstructure development in Bangkok clay stabilized with calcium carbide residue and biomass ash", ScienceAsia, 39, 186-193.   DOI
7 Abd El-Aziz, M.A., Abo-Hashema, M.A. and El-Shourbagy, M. (2004), "The effect of lime-silica fume stabilizer on engineering properties of clayey subgrade", Engineering Conference, Faculty of Engineering, Mansoura University, Paper No. 96.
8 ACI Committee 116R-95 (2000), Cement and Concrete Terminology, American Concrete Institute.
9 ACI Committee 226-87 (1987), Silica Fume in Concrete: Preliminary Report, ACI Materials Journal, March-April, American Concrete Institute, pp. 66-158.
10 Akawwi, E. and Al-Kharabsheh, A. (2000), "Lime stabilization effects on geotechnical properties of expansive soils in Amman, Jordan", Electr. J. Geotech. Eng., 5, OK, USA.
11 ASTM D2166-00 (2013), Standard Test Methods for Unconfined Compressive \ Strength of Cohesive Soil, American Society of Testing and Materials, West Conshohocken, PA, USA.
12 ASTM D698-00 (2000), Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400 ft-Idf/ft3 (600 kNm/$m^3$)), American Society of Testing and Materials, West Conshohocken, PA, USA.
13 British Standard B.S: C.P. 8004 (1986), Code of Practice for Foundations, British Standard Institution, London, UK.
14 Das, B.M. (2002), Principles of Geotechnical Engineering, (5th Edition), Wadsworth Group, CA, USA.
15 Das, P. and Pal, S.K. (2013), "A study of the behavior of stone column in local soft and loose layered soil", Electr. J. Geotech. Eng., 18(Bund, I.), 1777-1786.
16 Harris, P., Scullion, T. and Sebesta, S. (2004), "Hydrated lime stabilization of sulfate-bearing soils in Texas", Report No., FHWA/TX-04/0-4240-2, Texas Department of Transportation, Research and Technology Implementation Office.
17 Demir, A., Yildiz, A., Laman, M. and Ornek, M. (2013), "Experimental and numerical analyses of circular footing on geogrid-reinforced granular fill underlain by soft clay", Acta Geotechnica, 9(4), 711-723. DOI: 10.1007/s11440-013-0207-x   DOI
18 Fang, H.Y. and Daniels, J.L. (2006), Introductory Geotechnical Engineering, (First Edition), Taylor & Francis Group, UK.
19 Fattah, M.Y., Shlash, K.T. and Al-Waily, M.J. (2011), "Stress concentration ratio of model stone columns in soft clays, Geotech. Test. J., ASTM, 34(1), 61-71.
20 Ingles, O.G. and Metcalf, J.B. (1972), Soil Stabilization, Butterworth pty, Ltd., Australia.
21 Kempfert, H.G. and Gebreselassie, B. (2006), Excavations and Foundations in Soft Soils, Springer-Verlag Berlin Heidelberg, Germany.
22 Kumar, N., Swain, S. and Sahoo, U. (2012), "Stabilization of a clayey soil with fly ash and lime: A micro level investigation", J. Geotech. Geol. Eng., 24(5), 1197-1205.
23 Little, D.N. (1995), Handbook for Stabilization of Pavement Subgrades and Base Courses with Lime, Kendall Hunt, IA, USA.
24 Little, D.N. (1999), "Evaluation of structural properties of lime stabilized soils and aggregates", Volume 1: Summary of Findings, National Lime Association, Web Address: www.lime.org/SOIL.PDF