Immediate Settlement of Shallow Foundations Bearing on Clay
Publication: International Journal of Geomechanics
Volume 8, Issue 5
Abstract
Immediate and long-term settlement checks are an integral part of foundation design. Therefore, reasonably accurate estimates of the immediate settlement of shallow foundations bearing on clay are necessary, particularly for highly plastic clays or organic soils, for which the immediate settlement may be significant. This immediate settlement is due entirely to the distortion of the clay underneath the shallow foundations because, in the short term, there is no opportunity for change in the clay volume. Since soil stress-strain response is nonlinear even at small strains, design procedures based on linear elasticity cannot accurately predict soil deformations. Hence, an immediate settlement analysis that takes soil nonlinearity into account is needed. In this paper, finite-element analysis is used to develop design charts that can be used to estimate the immediate settlement of axially loaded square, rectangular, and strip footings bearing on clay. The clay is modeled with a simple nonlinear constitutive relationship. A design example is included to illustrate how the proposed procedure can be readily applied in practice with the knowledge of the undrained shear strength and the initial shear modulus of the clay.
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References
Burland, J. B., and Burbidge, M. C. (1985). “Settlement of foundations of sand and gravel.” Proc., Institute of Civil Engineers, Vol. 78, Thomas Telford, London, 1325–1381.
Christian, J. T., and Carrier, W. D. (1978). “Janbu, Bjerrum and Kjaernsli’s chart reinterpreted.” Can. Geotech. J., 15, 123–128.
D’Appolonia, D. J., and Lambe, T. W. (1970). “Method for predicting initial settlement.” J. Soil Mech. and Found. Div., 96(2), 523–544.
D’Appolonia, D. J., Poulos, H. J., and Ladd, C. C. (1971). “Initial settlement of structures on clay.” J. Soil Mech. and Found. Div., 97(10), 1359–1377.
Davis, E. H., and Booker, J. R. (1973). “The effect of increasing strength with depth on the bearing capacity of clays.” Geotechnique, 23(4), 551–563.
Duncan, J. M., and Buchignani, A. L. (1987). An engineering manual for settlement studies, University of California Press, Berkeley, Calif.
Fahey, M., and Carter, J. P. (1993). “A finite element study of the pressure meter test in sand using a nonlinear elastic plastic model.” Can. Geotech. J., 30, 348–362.
Foott, R., and Ladd, C. C. (1981). “Undrained settlement of plastic and organic clays.” J. Geotech. Engrg. Div., 107(8), 1079–1094.
Higgins, K., Kovacevic, N., and Potts, D. M. (1999). “Use of appropriate soil models in soil structure interaction analysis.” Proc., Int. Symp. on Pre-Failure Deformation Characteristics of Geomaterials, Balkema, Rotterdam, The Netherlands, 773–781.
Kinner, E. B., and Ladd, C. C. (1973). “Undrained bearing capacity of footing on clay.” Proc., 8th Int. Conf. on Soil Mechanics and Foundation Engineering, Moscow, Springer, New York, 209–215.
Kondner, R. L. (1963). “Hyperbolic stress-strain response: Cohesive soils.” J. Soil Mech. and Found. Div., 89(1), 115–143.
Lee, J. H., and Salgado, R. (1999). “Determination of pile base resistance in sands.” Aeronaut. J., 125(8), 673–683.
Lee, J. H., and Salgado, R. (2000). “Analysis of calibration chamber plate load tests.” Can. Geotech. J., 37, 14–25.
Lee, J., and Salgado, R. (2002). “Estimation of footing settlement in sand.” Int. J. Geomech., 2(1), 1–28.
Mayne, P. W. (2000). “Enhanced geotechnical site characterization by seismic piezocone penetration tests.” Proc., 4th Int. Geotechnical Conf., Cairo University Press, Cairo, Egypt, 95–120.
Potts, D. M., and Zdravkovic, L. (1999). Finite element analysis in geotechnical engineering: Theory, Thomas Telford, London.
Salgado, R., Lyamin, A. V., Sloan, S. W., and Yu, H. S. (2004). “Two- and three-dimensional bearing capacity of foundations in clay.” Geotechnique, 54(5), 297–306.
Schmertmann, J. H. (1970). “Static cone to compute static settlement over sand.” J. Soil Mech. and Found. Div., 96(3), 1011–1043.
Schmertmann, J. H., Brown, P. R., and Hartman, J. P. (1978). “Improved strain influence factor diagrams.” J. Geotech. Engrg. Div., 104(8), 1131–1135.
Shibuya, S., and Mitachi, T. (1994). “Small strain shear modulus of clay sedimentation in a state of normal consolidation.” Soils Found., 34(4), 67–77.
Simon, R. M., Christian, J. T., and Ladd, C. C. (1974). “Analysis of undrained behavior of loads on clay.” Soils and foundations: Analysis and design in geotechnical engineering, Austin, Tex., ASCE, New York, 51–84.
Viggiani, G., and Atkinson, J. H. (1995). “Stiffness of fine-grained soil at very small strains.” Geotechnique, 45(2), 249–265.
Viggiani, G., and Tamagnini, C. (1999). “Hypoplasticity for modelling soil nonlinearity in excavation problems.” Proc., Int. Symp. on Pre-Failure Deformation Characteristics of Geomaterials, Balkema, Rotterdam, The Netherlands, 581–588.
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Information
Published In
International Journal of Geomechanics
Volume 8 • Issue 5 • September 2008
Pages: 300 - 310
Copyright
© 2008 ASCE.
History
Received: Nov 8, 2006
Accepted: Nov 19, 2007
Published online: Sep 1, 2008
Published in print: Sep 2008
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