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Title: Effect of degree of saturation on compressibility of soils from the Defence Research Establishment, Suffield
Authors: United States. Defense Atomic Support Agency
Hendron, Alfred Joseph
Davisson, M. T.
Parola, Jerry Frank, 1939-
Keywords: Defence Research Establishment, Suffield
Saturated soils
Soil moisture
Soil consolidation
Soil compacting
Soil strain
Soil stress
Soil mechanics
Publisher: U.S. Army Engineer Waterways Experiment Station.
Engineer Research and Development Center (U.S.)
Description: Contract Report
Abstract: Soil tests we re conducted to provide information on the influence of degree of saturation on high-pressure stress-strain relations of undisturbed and remolded soils from the Defence Research Establishment, Suffield, and to provide input data for computer codes concerning the relation between stress and strain invariants at high pressures. As expected, the test results presented herein show that large strains do not develop at high pressures in fine-grained soils such as silt and clay. The test program consisted of 12 one-dimensional tests on 4 specimens each of undisturbed and remolded silty clay, and 4 specimens of remolded sandy silt. In all tests the radial strain was essentially zero. Axial and radial stresses and axial strain were measured. The tests were carried to an axial stress of 20,000 psi unless soil extrusion occurred at a lower stress. The following conclusions were reached. The degree of saturation and the initial void ratio are the most significant variables governing the one-dimensional stress-strain relations of soil at high pressures. For pressures exceeding 3000 psi the compacted specimens and undisturbed specimens of Suffield soil yield the same relation if the initial degree of saturation and initial void ratio are identical before loading. A lower bound to the secant modulus of deformation M𝗌 at a given level of axial stress σa is given for both compacted and undisturbed samples of fine-grained soil subjected to pressures greater than 3000 psi. The average unloading modulus of Suffield soils subjected to pressures greater than 3000 psi is approximately 10 times the loading secant modulus of deformation M𝗌. It is probable that the stiffness of the Suffield soils when unsaturated will be greater under dynamic loading than the static values given herein. Previous comparisons of static and dynamic values of constrained moduli of Suffield soils have shown that the dynamic values are twice the static values. This observation is consistent with similar comparisons for NTS Frenchman Flat silt.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Contract Report

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