Settlement is an important criterion in the design of the foundations. It is classifying into immediate (or elastic) settlement and consolidated settlement (primary and secondary). The factors that affect the shallow foundation settlement are the applied loads, soil stiffness, and geometric shape of foundation. Calculations of settlement depend on the parameters of soil which can be obtained from field and laboratory tests. Field and laboratory tests were conducted for twenty three sites in three different regions in Iraq (Mosul, Baghdad, and Basrah). In this research, field and laboratory tests results adopted for two sites from each region depended on the maximum and minimum bearing capacity values. Settlement for each site was calculated using numerical (mathematical) calculations and PLAXIS software under different added loads. The results of settlements beneath the foundation were competing for the sites with maximum value of bearing capacity in Mosul; Baghdad and Basrah. Also, the comparison conducted for sites of minimum bearing capacity value and the results showed different settlement values of each site. The change of settlement values under different loads was linearly in the six sites using numerical (mathematical) calculations. While, the settlement values obtained from PLAXIS software for sites with maximum bearing capacity value showed that Mosul site had the highest value due to the type of soil layers and the difference models of soil used in the software. Basrah site had a settlement value higher than Baghdad site due to the soil layers of sand type only. PLAXIS results for sites with minimum bearing capacity showed that for Basrah site the soil went to failure. While, the settlement values for Mosul and Baghdad sites were close to each other due to have nearly same soil layers. Therefore, high rise buildings could not be used in some sites. Also, soil in some locations and under some added loads needed to be improved before the implementation of any constructions.
References
[1]
Liu, C. and Evett, J.B. (2008) Soils and Foundations. 7th Edition, Pearson Prentice Hall, Upper Saddle River.
[2]
Bowles, J.E. (1996) Foundation Analysis and Design. 5th Edition, The McGraw-Hill Companies, Inc., New York.
[3]
Shahriar, M.A., Sivakugan, N., Urquhart, A., Tapiolas M. and Das, B.M. (2013) A Study on the Influence of Ground Water Level on Foundation Settlement in Cohesionless Soil. The 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, 2-6 September 2013, 216-229.
[4]
Al-Ramthan, A.Q.O. (2012) Using Matlab with Quadrilateral Finite Elements in Analysis of Multi-Layered Nonhomogeneous Soils under Strip Footing. Research Journal of Applied Sciences, Engineering and Technology, 4, 717-723.
[5]
Murthy, V.N.S. (2002) Geotechnical Engineering: Principles and Practices of Soil Mechanics and Foundation Engineering. Marcel Dekker Inc., New York.
[6]
Das, B.M. (2015) Elastic Settlement of Shallow Foundations on Granular Soil: A Critical Review.
http://gle.wisc.edu/wp-content/uploads/2013/07/Elastic-Settlement-Shallow-Foundations_A-Critical-Review-2.pdf.
[7]
Smith, G.N. and Smith, I.G.N. (1998) Elements of Soil Mechanics. 7th Edition, Blackwell Science, Great Britain.
[8]
Jassim, S.Z. and Goff, J.C. (2006) Geology of Iraq. 1st Edition, Published by Dolin, Prague and Moravian Museum, Brno, Printed in the Czech Republic.
[9]
Al-Taie, E., Al-Ansari, N., Saaed, T.E. and Knutsson, S. (2014) Bearing Capacity Affecting the Design of Shallow Foundation in Various Regions of Iraq Using SAP200 & SAFE Softwares. Journal of Earth Sciences and Geotechnical Engineering, 4, 35-52.
[10]
Ail, S.M. (2012) Hydrogeological Environmental Assessment of Baghdad Area. PhD Thesis, College of Science, University of Baghdad, Baghdad.
[11]
Al-Taie, E., Al-Ansari, N. and Knutson, S. (2014) Effect of Bearing Capacity on Designing Foundations in Iraq Using STAAD Pro-v8i. Engineering, 6, 292-303. http://dx.doi.org/10.4236/eng.2014.66033
[12]
Al-Baidhany, A.H. and Albadran, B.N. (2005) Biofacies and Sedimentary Environments of Recent Sediments of Southern Part of Mesopotamian Plain. Journal of Basrah Researches (Sciences), 31, 13-20.
[13]
Almutury, W.Gh. and Al-Asadi, M.M. (2008) Tectonostratigraphic History of Mesopotamian Passive Margin during Mesozoic and Cenozoic, South Iraq. Journal of Kirkuk University, 3, 31-50.
Akpila, S.B. (2014) Bearing Capacity and Settlement Response of Raft Foundation on Sand Using Standard Penetration Test Method, SENRA Academic Publishers, British Columbia. Canadian Journal of Pure & Applied Sciences, 8, 2769-2774.
[16]
Brahma, P. and Mukherjee, S.P. (2010) A Realistic Way to Obtain Equivalent Young’s Modulus of Layered Soil. Indian Geotechnical Conference, GEOtredz, IGS Mumbai Chapter & IIT Bombay, Mumbai, 16-18 December 2010, 305-308.
[17]
Bajad, S.P. and Sahu, R.B. (2012) An Experimental Investigation on Interference of piled Rafts in Soft Soil. Civil and Environmental Research Journal, 2, 49-59. www.iiste.org
[18]
Ahmed, M., Mohamed, M.H., Mallick, J. and Hasan, M.A. (2014) 3D-Analysis of Soil-Foundation-Structure Interaction in Layered Soil. Open Journal of Civil Engineering, 4, 373-385. http://dx.doi.org/10.4236/ojce.2014.44032
[19]
PLAXIS Version 2012.02 (2012) Material Manual, Delft University of Technology & PLAXIS. The Netherlands, A. A. Balkema, Publishers. http://www.plaxis.nl/
[20]
Das, B.M. (1999) Fundamentals of Geotechnical Engineering. Brooks/Cole, Pacific Grove.
[21]
Ehsan, R. (2013) A Study of Geotechnical Constitutive Models Used in PLAXIS 2D. ICE G&S Papers Competition.
http://www.ice.org.uk/ICE_Web_Portal/media/southeast/Competitions/Raisa-Ehsan-past-paper.pdf
