Distribution of Stress on Stone Column-Reinforced Soft Soil under Cylindrical Storage Tank

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Abstract:

Structures with circular foundation (chimney, silo, oil tank) constructed on compressible soft soil, often have to opt for ground improvement like stone columns before construction. In this paper, the stress distribution on stone column-reinforced ground under cylindrical storage tank has been presented. Actual foundation soil reinforced with stone column is assumed as composite ground of soil and hollow cylindrical stone rings keeping the area ratio constant to carry the analysis in axi-symmetric condition. The soft soil, stone columns and granular fill are idealized using mechanical elements. The floor slab of the storage tank is assumed to be flexible enough to satisfy the theory of thin plate. Governing differential equations are derived to determine the vertical settlement and solved with finite difference technique. Contact stress at ground level is calculated from vertical settlement. It is observed that soft soil experiences heavy settlement and contact stress when the tank is full despite of low spacing to diameter ratio (S/dc = 3) and reasonable modular ratio (Ec/Es = 20). It is also observed that stress acting on edge stone column is lower as compared to the stress acting on center stone column even under uniformly loaded condition.

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699-704

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June 2014

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[1] Selvadurai A.P.S., The Interaction between a Uniformly Loaded Circular Plate and an Isotropic Elastic Halfspace: A Variational Approach, J. Structural Mech. 7 (1979) 231-246.

DOI: 10.1080/03601217908905320

Google Scholar

[2] Zaman, M.M., Kukreti, A.R., Issa, A., Analysis of circular plate-elastic half-space interaction using an energy approach, Appl. Math. Modelling. 12 (1988) 285-292.

DOI: 10.1016/0307-904x(88)90036-4

Google Scholar

[3] Mastrojannis, E.N., Keer, L.M., Mura, T., Axisymmetrically loaded thin circular plate in adhesive contact with an elastic half-space, Computational Mechanics. 3 (1988) 283-298.

DOI: 10.1007/bf00368962

Google Scholar

[4] Faruque, M.O., Zaman, M., A mixed-variational approach for the analysis of circular plate-elastic halfspace interaction, Computer Methods in Applied Mechanics and Engineering. 92 (1991) 75-86.

DOI: 10.1016/0045-7825(91)90198-f

Google Scholar

[5] Vallabhan, C.V.G., Das, Y.C., Analysis of circular tank foundations, J. Eng. Mech. 117 (1991) 789-797.

DOI: 10.1061/(asce)0733-9399(1991)117:4(789)

Google Scholar

[6] Rad, A.B., Alibeigloo, A., Semi-Analytical Solution for the Static Analysis of 2D Functionally Graded Solid and Annular Circular Plates Resting on Elastic Foundation, Mechanics of Advanced Materials and Structures. 20 (2013) 515-528.

DOI: 10.1080/15376494.2011.634088

Google Scholar

[7] Balaam, N.P., Booker, J.R., Analysis of rigid rafts supported by granular piles, Int. J. Numer. Analyt. Meth. Geomech. 5 (1981) 379–403.

DOI: 10.1002/nag.1610050405

Google Scholar

[8] Mitchell, J.K., Huber, T.R., Performance of a stone column foundation, J. Geotech. Engrg. 111 (1985) 205–223.

DOI: 10.1061/(asce)0733-9410(1985)111:2(205)

Google Scholar

[9] Lee, J.S., Pande, G.N., Analysis of stone-column reinforced foundations, Int. J. Numer. Anal. Meth. Geomech. 22 (1998) 1001-1020.

DOI: 10.1002/(sici)1096-9853(199812)22:12<1001::aid-nag955>3.0.co;2-i

Google Scholar

[10] Ambily, A.P., Gandhi, S.R., Behavior of stone column based on experimental and FEM analysis, J. Geotech. Geoenviron. Eng. 133 (2007) 405–415.

DOI: 10.1061/(asce)1090-0241(2007)133:4(405)

Google Scholar

[11] Indraratna, B., Aljorany, A., Rujikiatkamjorn, C., Analytical and numerical modeling of consolidation by vertical drain beneath a circular embankment, Int. J. Geomech. 8 (2008) 199-206.

DOI: 10.1061/(asce)1532-3641(2008)8:3(199)

Google Scholar

[12] Deb, K., Basudhar, P.K., Chandra, S., Axi-symmetric analysis of geosynthetic-reinforced granular fill-soft soil system with group of stone columns, Geotech. Geol. Engrg. 28 (2010) 177-186.

DOI: 10.1007/s10706-009-9291-y

Google Scholar

[13] Dey, A., Chandra, S., Basudhar, P.K., Flexural response of aqueduct resting on reinforced elastic foundation beds, National Conference on Recent Advances in Ground Improvement Techniques, 24-25 February, CBRI Roorkee, India (2011).

DOI: 10.3850/gi149

Google Scholar

[14] Indraratna, B., Balasubramaniam, A.S., Balachandran, S., Performance of test embankment constructed to failure on soft marine clay, J. Geotech. Engrg. 118 (1992) 12-33.

DOI: 10.1061/(asce)0733-9410(1992)118:1(12)

Google Scholar

[15] Elshazly, H.A., Hafez, D.H., Mossaad, M.E., Reliabilty of conventional settlement evaluation for circular foundation on stone column, Geotech. Geol. Engrg. 26 (2008) 323-334.

DOI: 10.1007/s10706-007-9169-9

Google Scholar