Cumulative plastic deformation for fine-grained subgrade soils

Article Abstract:

Authors Dingqing Li and Ernest T. Selig have addressed a highly significant issue pertaining to prediction of cumulative plastic deformation of soils under repeated loading. They developed a model and evaluated the variation of its A and b parameters with soil parameters and soil types, finally making a comparison between predicted and experimental results for a railroad-track subgrade. Their model is contrasted with a more generalized model for predicting the cumulative plastic strain in soil under repeated loading.

Evaluation, Mathematical models, Criticism and interpretation, Soil structure, Li, Dingqing, Selig, Ernest T.

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Probability method applied to dynamic pile-driving control

Article Abstract:

The use of a mathematical formulation of a probabilistic energy approach is a feasible alternative to the signal matching method for establishing a dynamic pile-driving control system. Statistical analysis showed that Smith damping is affected by time, although the assumption that the probability method overpredicts low pile capacities is questionable. The probabilistic approach treats the Smith model parameters, quakes and damping factors as nonstandard soil mechanics parameters.

Structural engineering, Piling (Civil engineering), Pilings (Building), Structural stability, Damping (Mechanics), Damping (Physics)

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Subgrade resilient modulus correction for saturation effects

Article Abstract:

A study on resilient modulus tests on laboratory compacted saturated soil samples is evaluated. It is argued that the models used by the study failed to predict the impact of postcompacted water content increases on the resilient modulus of high-plasticity soils, since these effects can only be accurately determined via tests on field samples. Data errors also were observed due to the conversion of foot-pound-second values to the SI system.

Research, Soil stabilization

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