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Geomaterials exhibit complex but rich mechanical behaviour with a variety of failure modes ranging from diffuse to localized deformation depending on stress, density, microstructure, and loading conditions. These failure modes are a result of an instability of material and/or geometric nature that can be studied within the framework of bifurcation theory. Degradation is another related phenomenon arising from cyclic loading, ageing, weathering, chemical attack, and capillary effects, among others. The methodology of analyzing the various types of instabilities is crucial in the adequate modelling and safe design of numerous problems in geomechanics. The present volume contains a sampling of enlarged versions of papers presented at the International Workshop on Bifurcation and Degradations in Geomaterials (IWBDG 2008) held in Lake Louise, Alberta, Canada, May 28-31, 2008. These papers capture the state-of-the-art in the specialized field of geomechanics and contemporary approaches to solving the central issue of failure. Some engineering applications are presented in the areas of energy resource extraction and soil-machine interaction.
New York Mills, named for the textile factories that were once the backbone of the surrounding village's economy, ranked among the foremost producers of quality fabrics in the country. Originally a wilderness area just south of the Mohawk River, the community began with a few scattered homes after the establishment of a small textile mill in 1808. Nourished by a growing economy, the village attracted a mosaic of Welsh and French-Canadian workers in the 19th century, followed by Poles, Syro-Lebanese, and Italians in the early 20th century. A hotbed of abolitionism in the antebellum years, it sent high percentages of its residents off to the Civil War, World War I, and World War II. In 1912 and 1916, its Polish residents founded a union and led textile strikes that were considered the most successful in the nation at that time. With the eventual closing of the mills in the 1950s, residents found employment in the surrounding area as the village evolved into a stable and prosperous suburban community.
This book is a short yet rigorous course on a new paradigm in soil mechanics, one that holds that soil deformation occurs as a simple friction-based Poisson process in which soil particles move to their final position at random shear strains. It originates from work by Casagrande’s soil mechanics group at Harvard University that found that an aggregate of soil particles when sheared reaches a "steady-state" condition, a finding in line with the thermodynamics of dissipative systems. The book unpacks this new paradigm as it applies to soils. The theory explains fundamental, ubiquitous soil behaviors and relationships used in soils engineering daily thousands of times across the world, but w...
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This publication provides a guide to the Minnesota Department of Transportation's current research activities.