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IJSTR >> Volume 7 - Issue 11, November 2018 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



Behavior Of Concrete Slab Supported By A Voided Sandy Soil

[Full Text]

 

AUTHOR(S)

Muhammed Abed Attiya, Laith Jawad Aziz, Ola Mazen Mekki

 

KEYWORDS

concrete slab, voided soil, numerical model, ANSYS simulation, case study, sandy soil, gypsum dissolution.

 

ABSTRACT

Slab supported by a soil media is a widely used form of constructions in the civil engineering. When a cavity forms -due to gypsum dissolution- below the slab, a loss of support case or weak supporting condition will occur. In this paper, an experimental model has been tested in the laboratory to discus the load deflection curve of a real case of slab on soil. A good agreement obtained when simulating the experimental result by a numerical analysis program (ANSYS). Parametric studies have been made to show the effect of forming a cavity of different depths, various diameters, changing the slab thickness, and variation the concrete compressive strength. From this research, it can be concluded that forming a cavity of (D/T) = 0.13 (cavity depth to total depth of soil) causes to reduce the slab capacity by (148%) when comparing with a soil without cavity, and using a cavity of (d/B) =1 (cavity diameter to slab width) leads to reduce the slab failure load by (212.5%) when comparing with a soil without cavity. The failure load versus cavity depth and diameter has been obtained. The concrete compressive strength vs failure load of slab has been drawn.

 

REFERENCES

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[2]. Buringh. p, “soils and soil conditions in Iraq”, Directorate of Research, Iraq, 1960.

[3]. Ahmed, F., and Said, M. “Effect of leaching and gypsum content on properties of gypsums soil”, School of Civil Engineering, Engineering Campus, University Sains, Malaysia 2012.

[4]. Gupta, P., “Finite Element Static Analysis of Slabs on Elastic Foundation”., bachelor of technology thesis, Pourkela, 2015.

[5]. Wiley, J., Sons, “soil mechanics and foundations”.

[6]. Willam, K. J. and Warnke, E. P., "Constitutive Model for the Triaxial Behavior of Concrete", Proceedings, International Association for Bridge and Structural Engineering, Vol. 19, ISMES, Bergamo, Italy, 1975, pp.174.

[7]. ACI Committee 360, "Design of Slabs on Grade", American Concrete Institute, Michigan, pp. 57, 1992.