Settlement Modelling of Raft Footing Founded on Oferekpe/Abakaliki Shale in South East Region of Nigeria

Bunyamin, Salahudeen; Aghayan, Saideh

doi:10.22115/cepm.2018.116754.1009

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	Settlement Modelling of Raft Footing Founded on Oferekpe/Abakaliki Shale in South East Region of Nigeria
Article 6, Volume 1, Issue 1, Winter 2018, Page 68-82 PDF (1096 K)
Document Type: Original Article
DOI: 10.22115/cepm.2018.116754.1009
Authors
Salahudeen Bunyamin ¹; Saideh Aghayan²
¹Ph.D., Samaru College of Agriculture, Division of Agricultural Colleges, Ahmadu Bello University, Zaria, Nigeria
²Ph.D. Candidate, Department of Mining and Metallurgical Engineering, Amirkabir University, Tehran, Iran
Receive Date: 25 January 2018, Revise Date: 11 March 2018, Accept Date: 31 March 2018
Abstract
In engineering practice, settlement of foundations are experimentally determined or numerically modelled based on conventional saturated soil mechanics principles. The study area, Oferekpe in Abakaliki LGA of Ebonyi State, South Eastern Region of Nigeria is characterised with sedimentary formations highly susceptible to compression under applied load. The study was aimed at evaluating raft footing settlement by both analytical and numerical modelling methods and determine the effect of raft thickness on settlement. Standard penetration test (SPT) data was used to correlate soil properties that were used together with laboratory results to obtain the input parameters used for the prediction of settlement. Four footing embedment depths of 1.5, 3.0, 4.5 and 6.0 m with applied foundation pressures of 50, 100, 200, 300, 400 and 500kN/m2 were considered using a raft footing dimension of 20 x 20 m2 at varying thickness of 0.5, 0.75 and 1.0 m. The numerical modelling finite element application package used was Plaxis 3D. For applied pressure of 100 kN/m2 and at footing embedment depths of 1.5, 3.0, 4.5 and 6.0 m, settlement values of (21.89, 11.51, 9.04 and 6.52), (19.70, 8.60, 6.41 and 4.39), (25.62, 14.88, 12.05 and 9.27) and (25.20, 11.59, 5.57 and 2.58) were respectively predicted by the elastic, semi-empirical, empirical and finite element methods. The elastic method of predicting foundation settlement proposed by Steinbrenner yielded a very close range results generally to those predicted by finite element method. It was generally observed that thickness of raft footing has no significant effect on the predicted settlement.
Keywords
Raft foundation; Settlement prediction; Numerical modelling; Standard penetration test; Plaxis 3D
Main Subjects
Civil Engineering
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