Undrained capacity of circular shallow foundations on two-layer clays under combined VHMT loading

Wind turbines are typically designed based on fatigue and serviceability limit states, but still require an accurate assessment of bearing capacity. Overconsolidated clay deposits in Canada often have a thin layer of crust with a relatively high undrained shear strength developed from weathering, desiccation, and geo-chemical processes. However, existing design methods only assess the bearing capacity using effective area and inclination factor without consideration of surficial crusts. This paper studies the undrained VHMT (vertical, horizontal, moment and torsional) failure envelope of circular foundations founded on a surficial crust underlain by a uniform soil with a zero-tension interface condition using finite element analysis. An analytical expression for the VHMT failure envelope is derived.

Decomposing and deducing the Coordinate Structure Constraint

The article shows that the Coordinate Structure Constraint (CSC) can be violated in a number of languages and establishes a novel cross-linguistic generalization regarding languages that allow violations of the CSC. A phase-based deduction of this generalization is then provided under a particular contextual approach to phases. In addition, based on the cross-linguistic data regarding violations of the CSC, it is argued that the CSC should be separated into two conditions: (i) the ban on extraction of a conjunct, and (ii) the ban on extraction out of a conjunct. This means that the whole coordinate structure (ConjP) as well as individual conjuncts are islands independently of each other. The article also addresses the long-standing debate regarding where in the grammar the CSC applies, arguing that the two different conditions that result from the separation of the traditional CSC ((i) and (ii) above) are deduced from different mechanisms in the architecture of the grammar: one is a purely syntactic condition, and the other is an interface condition.

Knowing, Knowing Perspicuously, and Knowing How One Knows

In Knowing and Seeing, Michael Ayers presents a view of what he calls primary knowledge according to which one who knows in that way both knows perspicuously and knows how they know. Here, I use some general considerations about seeing, knowing, and knowing how one knows in order to raise some questions about this view. More specifically, I consider some putative limits on one’s capacity to know how one knows. The main question I pursue concerns whether perspicuity should be thought of either (i) as a condition of sensory experience, (ii) as a condition of sense-based cognition, or (iii) as an interface condition, involving interrelations between sensory experience and sense-based cognition.

EFFECT OF CYCLE OF LOADING ON SUBBASE FRICTION CHARISARITICS UNDER RIGID PAVEMENT

The coefficient of friction is a measurement of the frictional force between two objects. As the temperature of the pavement changes, it might slide against the resistance of the supporting subbase. In order for pavement to perform as anticipated, this resistance must be calculated. Concrete cracking does not occur when the pavement is joined. A membrane layer is positioned between the subbase and the plate in joint plain concrete pavements to smooth the interface. The displacement of concrete caused by temperature differences is less resistant on a smooth surface. For subbase conditions, two stages of the push-off test were performed (smooth and rough) to show the effects of movement cycles. Based on the results of the friction tests, the friction properties of the concrete and subbase were investigated. The parameters that influence the coefficient of friction and displacement are (interface state, movement rate, thickness number of movement cycles), changing the interface condition from smooth to rough leads to an increase the FRF of (6, 9 and 12 cm/hr) by (194.7, 194.4 and 189.8 %) respectively. Finally, once the applied force reaches a stable state, the frictional force increases dramatically. The most important influence on this force is the interface state, which is accompanied by movement rate and thickness. The variation of the relationship curves with number of cycles tends to be insignificant after the third to fourth cycle of slab movement.

THE PUSHOUT STRENGTH OF CONCRETE PAVEMENT SLAB AND CLAY SOIL LAYERS

The frictional forces between the concrete slab and base has been combined with the movements of the horizontal slab that have been induced by variations of the moisture and temperature in concrete slabs. The frictional drag that acts on the slab bottom as a result of base friction is in an opposite horizontal slab displacement direction, and resist movements of the horizontal slab. A condition of smoother interface provides lower resistance to slab movement. On the other hand, rough interfaces are beneficial in the reduction of the load-related stresses. As bonding degree between slab and foundation affects the friction that has been mobilized at interface, a realistic evaluation of friction of the interface is required for the rational designs of the concrete pavement. In this work, push-off test has been performed. Based upon results of the friction tests, the friction characteristics of concrete and soil have been researched. The parameters that influence the maximal displacement and friction coefficient are (interface state, rate of movement) for friction and (rate of movement, interface condition) for the displacements, respectively. Finally, once the applied force reaches a stable state, the frictional force increases dramatically. The most important influence on this force is the interface state, which is accompanied by movement rate. The change of the interface from a smooth to a rough surface increases the overall coefficient of friction.

Predicting Solvation Thermodynamics in Water and Ionic Liquids using the Multi-Scale Solvation Layer Interface Condition (SLIC)

We highlight the most recent developments of the solvation-layer interface condition (SLIC) continuum dielectric model in predicting solvation thermodynamics of neutral small molecules in water and multiple ionic liquids. We demonstrate that a simple temperature-dependent solvent-accessible-surface-area (SASA) correlation and a cavity-dispersion-combinatorial (CDC) theory, combined with the SLIC electrostatics model, provide highly accurate predictions of Gibbs solvation energies, solvation entropies, and solvation heat capacities. The SLIC/SASA model parameters are temperature dependent, whereas the SLIC/CDC parameters are constant. To address the lack of experimental data pertaining to the accuracy of the models, we conducted an extensive literature search and data compilation to obtain credible experimental solvation data. This yielded 159 and 123 data points for hydration entropies and heat capacities of neutral small molecules, respectively. Compared to experimental data, the SLIC/SASA and SLIC/CDC models, respectively, achieve an RMS error 1.39 (1.24) and 1.15 (1.76) kcal/mol for hydration free energy (hydration entropy) predictions. Solvation heat capacities are predicted with RMS errors 24.42 and 46.17 cal/mol/K. Most remarkably, the SLIC/CDC predictions of solvation entropies and heat capacities are made without apriori knowledge of experimental solvation entropies. In addition, the SLIC/SASA predictions of Gibbs solvation energies (solvation entropies) of 12 amino acid side-chain analogs in seven (three) ionic liquids are compared to the available explicit-solvent simulation data from Paluch et al.~\cite{Paluch12} and Latif~\cite{Latif14} et al.