IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308 _______________________________________________________________________________________ Volume: 04 Issue: 07 | July-2015, Available @ http://www.ijret.org 277 LOADING, UNLOADING AND RELOADING ON SQUARE FOOTING WITH GEOGRID AS A REINFORCEMENT Shweta N Vantamuri 1 , P.G.Rakaraddi 2 1 Post graduate student, Geotechnical engineering, Department of civil engineering, Basaveshwar engineering college, Bagalkot, Karnataka, India 2 Professor, Department of civil engineering, Basaveshwar engineering college, Bagalkot, Karnataka, India Abstract Superstructure transmits its loads to the foundation, and then to ground. Loading, unloading and reloading is happens in petroleum tanks and ship repair tracks. This paper presents laboratory tests were carried out on square footing having dimensions of 0.1 X 0.1m for different densities of 16.10kN/m 3 , 16.89kN/m 3 , 17.29kN/m 3 .Coated yarn geogrid is used as reinforcing material. In the present. Paper investigations were carried on by varying number of reinforcement layers such as N = 0, 1 2, 3.Drawn conclusion is as density of foundation bed increases, settlement of the footing decreases and as number of layers of reinforcement increases, settlement of the footing reduces. Keywords: Geogrid, square footing, LVDT, loading, unloading, reloading --------------------------------------------------------------------***----------------------------------------------------------------- 1. INTRODUCTION Foundation is lowest part of structure. A properly designed foundation transfers load throughout the soil without overstressing of soil. Overstressing of soil result in excessive settlement or shear failure of soil. In the present study investigations were carried out on the loading, unloading and reloading on square footing with geogrid as a reinforcement material. Varied parameter is number of reinforcement layer (N =0,1,2,3.) 2. EXPERIMENTAL STUDY 2.1 Test Equipment The tests were performed in a tank with length, breadth, and width of 60cm. Sides of the box is stiffened with the help of battens. The test tank is filled by raining technique as shown in the figure.1. Fig 1: Sand pouring technique Sand is poured from the funnel by maintaining required distance of free fall to achieve required density. Experimental setup is shown in fig 2. Fig 2: Experimental setup in laboratory 1)Screw jack, 2) Loading frame 3)Proving ring 4)Model footing 5)Sand 6)LVDT 7) LVDT display unit 8) Test tank