Modelling soil distortion during compaction for cylindrical stress load paths

Petersen, Claus Leth

doi:10.1111/j.1365-2389.1994.tb00492.x

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…Critical state models, in particular the model known as Modified Cam Clay, describe the stress–strain behaviour of unsaturated agricultural soil in a wide range of conditions. These include shear and compression tests (Kirby 1989, 1994;Petersen 1993, 1994;Kirby & O'Sullivan 1997), compaction in the field (Kirby et al . 1997) and the laboratory (Kirby 1994;Harris 1995;Kirby et al .…”

Section: Introductionmentioning

confidence: 99%

Estimating critical state soil mechanics parameters from constant cell volume triaxial tests

Kirby

O’Sullivan²,

Wood

1998

European J Soil Science

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Summary Compaction, tillage, stresses around growing roots and other soil deformation events may be predicted by the critical state model of soil mechanics, but estimating the parameters is time consuming and expensive. We develop a back analysis of the constant cell volume triaxial test, in which the critical state parameters are derived from the results of a single test. This both saves much labour and provides more information than traditional analyses, which require several triaxial compression tests and an isotropic compression test to yield the same information. The method finds, using a minimization algorithm and a quasi‐analytical solution to the stress–strain equations, the simulated soil deformation (and hence the properties used in that simulation) that best fits the test data. The minimization is a form of regression analysis. For normally consolidated samples the method provides stable estimates of the slope of the critical state line (M), the slope of the virgin compression line (λ) and elastic modulus (E). The standard errors of the estimates are small in relation to the means of these parameters. The estimates appear to be more reliable than those of more commonly used estimation procedures. The slope of the rebound line (κ) is estimated, but a measure of the accuracy of the estimate cannot be calculated.

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Section: Introductionmentioning

confidence: 99%

Estimating critical state soil mechanics parameters from constant cell volume triaxial tests

Kirby

O’Sullivan²,

Wood

1998

European J Soil Science

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Estimating critical state soil mechanics parameters from shear box tests

Kirby¹

1998

European J Soil Science

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Summary Prediction of compaction, tillage, root growth or other soil deformation events requires a description of the stress–strain properties of the soil such as the critical state model, but estimating the parameters is time consuming and expensive. I have developed a method of estimating critical state properties from a single shear box test, both saving much labour and providing more information than traditional analyses. The method is based on critical state analyses of the constant stress and constant volume shear box tests using the total stresses applied at the boundary. It derives the critical state property parameters from test data by minimizing the difference between test data and the simulated soil deformation (and hence the properties used in that simulation). The minimization is a form of regression analysis. The analyses resulted in good simulations of the history of states in space defined by τxyγxy and e space (constant stress test) or τxyγxy and σy space (constant volume test). For normally consolidated samples, the analysis of a single constant stress test provided estimates of the slope of the critical state line (M), the slope of the virgin compression line (λ), the slope of the rebound line (K), and the elastic modulus (E). The standard deviation of the estimate of kcould not be found. By contrast, the analysis of the constant volume test resulted in poor estimates, particularly of λ. This is because the test yields no information on changes of volume during deformation: hence volume change parameters are not successfully estimated. The constant volume test is therefore not suitable for back analysis.

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A Shearing Strain Model for Cylindrical Stress States

Johnson¹,

Bailey²,

Way³

2019

Transactions of the ASABE

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Abstract. A shearing strain model for soil was developed that includes soil behavior under compressive normal and shear stresses great enough to attain maximum compaction. The model was developed for a clay and a clay loam from triaxial data with various stress loading paths. This model relates the ratio of maximum shear stress acting on the cylindrical sample (tmax) to major principal stress (s1), to the ratio of maximum natural shearing strain to natural volumetric strain occurring after shear stress is initiated. The model accurately describes the shearing distortion of triaxial soil samples under cylindrical stress loading prior to yielding by plastic flow. This model predicts soil shearing strain for input stress states that realistically represent field conditions. Keywords: Principal stress and strain, Shearing strain, Shear stress, Soil compaction, Soil parameters, Triaxial tests.

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Modelling soil distortion during compaction for cylindrical stress load paths

Cited by 3 publications

References 12 publications

Estimating critical state soil mechanics parameters from constant cell volume triaxial tests

Estimating critical state soil mechanics parameters from constant cell volume triaxial tests

Estimating critical state soil mechanics parameters from shear box tests

A Shearing Strain Model for Cylindrical Stress States

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