Numerical Evaluation of Foundation of Digester Tank of Sewage Treatment Plant
Abstract
In the present study the foundation of digester tank, main part of sewage treatment plant, is reanalyzed analytically and numerically to check the adequacy of such foundation to support superstructure loading. The foundation of digester tank consists of raft foundation and bored piles. The diameter of raft is 33 m and thickness of 1 m, while the piles are bored type of diameter 0.6 m and length 15 m. After testing eleven working piles, it is found that three piles cannot support a load of 1.5 times the working load (1305 kN) safely or in other words the factor of safety of these failed piles is less than 1.5. The results of filed pile tests are reanalyzed using two well-known methods, Davisson’s method and Brinch-Hansen method to check the ultimate carrying capacity of tested piles. Also, this paper includes analysis of previous soil investigation report and conducting additional soil investigation by drilling three boreholes to secure the soil parameters used in the analytical and numerical analysis of digester tank foundation. SAFE 12 software is used to analysis the foundation of structure as piled-raft instead of pile group to interest from the interaction between soil and raft foundation. The results of analysis showed that the piles failed in the tests can support its share of the superstructure load by a factor of safety 1.8 and the piles success in the field tests can support its share of the superstructure load by a factor of safety not less than 2.86. Also, the settlement under structure will be less than 100 mm, where using piled-raft analysis reduces the settlement to be within allowable limits.
Keywords
References
SGI 2012. “Structural Design of the Digester Foundation.” Unpublished confidential Report (2012).
Hirai, Hiroyoshi. “Analysis of Piled Raft with Nodular Pile Subjected to Vertical Load Using a Winkler Model Approach.” International Journal for Numerical and Analytical Methods in Geomechanics 40, no. 13 (March 18, 2016): 1863–1889. doi:10.1002/nag.2520.
Al-Kaisi, A. A., Rahil, F. H. and Waheed, M. Q. “Comparison of the Behavior for Free Standing Pile Group and Piles of Piled Raft.” Engineering and Technology Journal 36, no. 4 (April 25, 2018). doi:10.30684/etj.36.4a.3.
Ghanbar Dezfouli, Mohammad, Masoud Dehghani, Adel Asakereh, and Behzad Kalantari. “Behavior of Geogrid Reinforced and Unreinforced Non-Connected Pile Raft Foundation.” International Journal of Civil Engineering 17, no. 6 (October 16, 2018): 709–722. doi:10.1007/s40999-018-0362-4.
Mali, Shivanand, and Baleshwar Singh. “Behavior of Large Piled Raft Foundation on Different Soil Profiles for Different Loadings and Different Pile Raft Configurations.” Innovative Infrastructure Solutions 4, no. 1 (January 11, 2019). doi:10.1007/s41062-018-0193-9.
Sheil, Brian. “Numerical Simulations of the Reuse of Piled Raft Foundations in Clay.” Acta Geotechnica 12, no. 5 (February 6, 2017): 1047–1059. doi:10.1007/s11440-017-0522-8.
Mali, Shivanand, and Baleshwar Singh. “Behavior of Large Piled-Raft Foundation on Clay Soil.” Ocean Engineering 149 (February 2018): 205–216. doi:10.1016/j.oceaneng.2017.12.029.
Watcharasawe, Kongpop. “3-D Numerical Analysis of Consolidation Effect on Piled Raft Foundation in Bangkok Subsoil Condition.” International Journal of GEOMATE 12, no. 31 (March 1, 2017). doi:10.21660/2017.31.6529.
Sinha, Anup, and A. M. Hanna. “3D Numerical Model for Piled Raft Foundation.” International Journal of Geomechanics 17, no. 2 (February 2017): 04016055. doi:10.1061/(asce)gm.1943-5622.0000674.
Al-Liqaa Engineering Bureau. “Pile testing report No. 614.” Unpublished confidential Report (2015).
Anand. N. Naik,Payal Patel, and Gunvant Solanki “A REVIEW ON PILED RAFT FOUNDATION FOR HIGH-RISE BUILDING.” International Journal of Advance Engineering and Research Development 4, no. 11 (November 30, 2017). doi:10.21090/ijaerd.61815.
Al-Mawal Company. “Soil investigation report for the site of Al-Dewainiya treatment plant project.” Unpublished confidential report (2013).
Al-Jorany, A. N. and Karkush, M. O. “Analysis report primary and secondary digesters Al-Dewainiya sewage treatment plant.” University of Baghdad, Unpublished confidential report (2015).
Kulhawy, Fred H., and Paul W. Mayne. “Manual on estimating soil properties for foundation design.” No. EPRI-EL-6800. Electric Power Research Inst., Palo Alto, CA (USA); Cornell Univ., Ithaca, NY (USA). Geotechnical Engineering Group, (1990).
Lambe, T. W. and Whitman, R. V. “Soil Mechanics” SI version, John Wily and Sons (1996).
Bowles, L. E. “Foundation Analysis and Design”, McGraw-hill (1996).
Das, B. M. “Principles of Foundation Engineering” 9th. Ed., Cengage learning (2015).
Terzaghi, K. and Peck, R. B. “Soil mechanics in Engineering Practice” New York, John Wiley and Sons (1967).
Tomlinson, M. J. and Woodward, J. “Pile Design and Construction Practice, Fifth Edition” CRC Press (November 28, 2007). doi:10.4324/9780203964293.
Skempton, A. W. and MacDonald, D. H. “The Aallowable Settlements of Buildings.” Proceedings of the Institution of Civil Engineers 5(6) (1965): 727-768.
Fleming, K., Weltman, A., Randolph, M. and Elson, K. “Piling Engineering, Third Edition” CRC Press (April 21, 2014). doi:10.1201/b22272.
Poulos, H. G. “Method of Analysis of Piled Raft Foundations” A Report Prepared on Behalf of Technical Committee TC18 on Piled Foundations, ISSMGE (2001).
Poulos, Harry G. “Tall Building Foundation Design” (July 20, 2017). doi:10.1201/9781315156071.
Wood, D. M. “Geotechnical Modelling” CRC Press (2004).
Poulos, H. G. and Davis, E. H. “Pile Foundation Analysis and Design”, Hohn Wiley and Sons, New York (1980).
SAFE. “Slab Analysis by the Finite Element Method” Computers and Structures, Inc., Berkeley, California (2009).
Pender, Michael, ed. “Soil-Foundation-Structure Interaction” (July 20, 2010). doi:10.1201/b10568.
Tomlinson, Michael, and John Woodward. “Pile Design and Construction Practice, Sixth Edition” (October 13, 2014). doi:10.1201/b17526.
DOI: 10.28991/cej-2019-03091306
Refbacks
- There are currently no refbacks.
Copyright (c) 2019 Mahdi O Karkush
This work is licensed under a Creative Commons Attribution 4.0 International License.
