DESICCATION THEORY FOR SOFT COHESIVE SOILS

A new desiccation theory is developed that provides a rational framework for the consolidation and desiccation analysis of soft fine-grained waste soils. The theory includes four consecutive segments that correspond chronologically to the phases that a soft soil layer undergoes in the field after deposition: consolidation under one-dimensional compression; desiccation under one-dimensional shrinkage; propagation of vertical cracks and tensile stress release; and desiccation under three-dimensional shrinkage. A general form of the finite strain governing equation of the overall consolidation and desiccation process is formulated. It includes the cracking function and the nonlinear constitutive relations. The experimentally obtained consolidation and desiccation characteristics for soft china clay, which are needed for the overall analysis of a given field problem, are presented. The predictions of this theory for the response of a hypothetical soft china clay layer undergoing self-weight consolidation, see...

[1]  G. L. England,et al.  The Theory of One-Dimensional Consolidation of Saturated Clays , 1967 .

[2]  Stanley J. Johnson,et al.  State-of-the-Art Applicability of Conventional Densification Techniques to Increase Disposal Area Storage Capacity , 1977 .

[3]  Leslie G. Bromwell,et al.  Design Capacity of Slurried Mineral Waste Ponds , 1983 .

[4]  G. E. Blight.  Some Less Familiar Aspects of Hydraulic Fill Structures , 1988 .

[5]  W. Fox.  A STUDY OF BULK DENSITY AND WATER IN A SWELLING SOIL , 1964 .

[6]  A. Hillerborg,et al.  Analysis of crack formation and crack growth in concrete by means of fracture mechanics and finite elements , 1976 .

[7]  W. E. Larson,et al.  The Effect of Water Content on Axial Strain in a Loam Soil under Tension and Compression 1 , 1967 .

[8]  M. Kawamura,et al.  Estimation of the spacing and the width of cracks caused by shrinkage in the cement-treated slab under restraint , 1993 .

[9]  J. Bronswijk,et al.  Modeling of water balance, cracking and subsidence of clay soils , 1988 .

[10]  Joe T. Ritchie,et al.  Soil shrinkage relationships of Texas vertisols: I. Small cores. , 1980 .

[11]  J. K. Mitchell.  Densification and Improvement of Hydraulic Fills , 1988 .

[12]  R. Fell,et al.  MODELING DESICCATING BEHAVIOR OF MINE TAILINGS , 1992 .

[13]  David J. Williams,et al.  The behavior at the shrinkage limit of clay undergoing drying , 1992 .

[14]  Physics of swelling and cracking soils , 1975 .

[15]  Michael McVay,et al.  Quiescent Consolidation of Phosphatic Waste Clays , 1986 .

[16]  A. Lachenbruch.  Mechanics of Thermal Contraction Cracks and Ice-Wedge Polygons in Permafrost , 1962 .

[17]  Zdenek P. Bazant,et al.  Compression Failure of Quasibrittle Material: Nonlocal Microplane Model , 1992 .