Folding, Destructuring, and Strength Changes in Overconsolidated Varved Clay under Embankment Loading
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 139, Issue 10
Abstract
Evidence of the lateral compression of the Earth’s crust is apparent from folds and faults observed in rock, and the mechanics describing their development is well established in the fields of structural geology and tectonics. This paper describes similar structures in soils that developed in multilayered varved clay under the side slopes and toe of an embankment due to the nonuniform loading. Using analytical methods derived for the buckling of thin plates of alternating high and low moduli, predictions of wavelengths and the critical stresses to initiate folding were determined, and found to correlate with field and laboratory measurements. When these conditions occur, the resulting fabric changes have implications for slope stability modeling and the interpretation of field monitoring observations. This includes the ability of the clay to sustain large strains as it transitions from a highly anisotropic macrofabric to a relatively homogeneous material, without undergoing shear failure.
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Acknowledgments
Drilling was performed by Boart-Longyear; Summit Drilling; and Jersey Boring and Drilling. Laboratory testing was by French and Perillo Engineers; TRC Engineers; and TerraSense. Ms. A. Fyodorova, P.G. of Yu and Associates, and T. W. Biolsi, P.G., formerly of EA Engineering, oversaw the field investigations and provided helpful insights.
References
ASTM. (2000a). “Standard practice for thin walled sampling of soils for geotechnical purposes.” D1587-00, West Conshohocken, PA.
ASTM. (2000b). “Standard test method for consolidated undrained direct simple shear testing of cohesive soils.” D6528-00, West Conshohocken, PA.
ASTM. (2004). “Standard test methods for one dimensional consolidation properties of soils using incremental loading.” D2435-04, West Conshohocken, PA.
ASTM. (2006). “Standard test method for unconfined compressive strength of cohesive soil.” D2166-06, West Conshohocken, PA.
Beck, T. J., and Kane, W. F. (1996). “Current and potential uses of time domain reflectometry for geotechnical monitoring.” Proc., 47th Highway Geol. Symp., Wyoming Dept. of Transportation, Cody, WY, 94–103.
Becker, D. E., Crooks, J. H., Been, K., and Jefferies, M. G. (1987). “Work as a criterion for determining in situ and yield stresses in clays.” Can. Geotech. J., 24(4), 549–564.
Biot, M. A. (1965). Mechanics of incremental deformations, Wiley, New York.
Burlingame, M. J., Fouda, A. M., and Hart, R. D. (2006). “Modeling of landfill stability with vertical barrier walls: A practical example using limit equilibrium and numerical methods.” Proc. GeoCongress 2006, ASCE, New York.
Cobbold, P. R., Cosgrove, J. W., and Summers, J. M. (1971). “Development of internal structures in deformed anisotropic rocks.” Tectonophysics, 12(1), 23–53.
Dounias, G. T., Potts, D. M., and Vaughan, P. R. (1988). “The shear strength of soils containing undulating shear zones—A numerical study.” Can. Geotech. J., 25(3), 550–558.
Hart, J. K., and Boulton, G. S. (1991). “The interrelation of glaciotectonic and glaciodepositional processes within the glacial environment.” Quat. Sci. Rev., 10(4), 335–350.
Hill, P. R., Moran, K. M., and Blasco, S. M. (1982). “Creep deformation of slope sediments in the Canadian Beaufort Sea.” Geo-Mar. Lett., 2(3–4), 163–170.
Johnson, A. M. (1977). Styles of folding, Elsevier Scientific Publishing, New York.
Ladd, C. C., and DeGroot, D. J. (2003). “Recommended practice for soft-ground site characterization.” Proc., Soil and Rock America 2003, Vol. 2, ASCE, New York, 1–55.
Ladd, C. C., and Foote, R. (1974). “A new design procedure for stability of soft clays.” J. Geotech. Engrg. Div., 100(GT7), 763–786.
Lan, L., and Huddleston, P. J. (1991). “Finite element models of buckle folds in non-linear materials.” Tectonophysics, 199(1), 1–12.
Oweis, I. S., Dakes, G., Marturano, T., and Wierer, R. (1994). “Soil-cover success.” Civil Eng. Mag., 64(10), 58–59.
Price, N. J., and Cosgrove, J. W. (1990). Analysis of geologic structures, Cambridge University Press, Cambridge, U.K.
Ramberg, H. (1970). “Folding of laterally compressed multilayers in the field of gravity, I.” Phys. Earth Planet. Inter., 2(4), 203–232.
Ramberg, H. (1971). “Folding of laterally compressed multilayers in the field of gravity, II, numerical examples.” Phys. Earth Planet. Inter., 4(2), 83–120.
Read, D. J., Duckett, R. A., Sweeney, J., and McLeish, T. C. B. (1999). “The chevron folding instability in thermoplastic elastomers and other layered materials.” J. Phys. D Appl. Phys., 32(16), 2087–2099.
Roberts, D. A., and Hart, J. K. (2005). “The deforming bed characteristics of a stratified till assemblage in north East Anglia, U.K: Investigating controls on sediment rheology and strain signatures.” Quat. Sci. Rev., 24(1–2), 123–140.
Saxena, S.K., Hedberg, J, and Ladd, C.C. (1978). “Geotechnical properties of Hackensack Valley varved clays of New Jersey.” Geotech. Testing J., 1(3), 148–161.
Skempton, A. W., Norbury, D., Petley, D. J., and Spink, T. W. (1991). “Solifluction shears at Carsington, Derbyshire.” Engr. Geol. Sp. Pub., Geological Society, London, 7, 381–387.
Wiltschko, D. V. (1979). “A mechanical model for thrust sheet deformation at a ramp.” J. Geophys. Res., 84(B3), 1091–1104.
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© 2013 American Society of Civil Engineers.
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Received: Jan 24, 2011
Accepted: Feb 1, 2013
Published online: Feb 4, 2013
Published in print: Oct 1, 2013
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