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Minutes of proceedings Volume 65

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    Available in PDF - DJVU Format | Minutes of proceedings Volume 65.pdf | Language: ENGLISH
    Institution of Civil Engineers (Author)

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1881 Excerpt: ...If piles could be drawn and the spaces left by them filled with concrete this should always be done. Mr. G. W. Sutcliffe observed that the time during which the Mr. Sutcliffe. experiments mentioned in the Paper had been continued was not given, but it was a most important element, especially in experiments on a small scale. All materials when damp would remain in a vertical position unsupported for a short time, the height of vertical face varying with the character of the material: obviously, within the limit of height of possible vertical face no active pressure against a, wall could be expected until by the access of air, weather, c., a change had taken place. Time would probably be found to be a more important element when the material was wet than when dry, but assuming sufficient time to be allowed the results would be more constant. Coulomb's theory applied only to cases of purely frictional action without any adhesion or tenacity to influence the result: every case in which sidelong ground was formed into steps illustrated the advantages which were found to be practically available by paying attention to the tenacity of earth. The greatest possible height of vertical face appeared to furnish the best available index as to the effect of tenacity in influencing the result, being just sufficient to successfully resist the action of gravity in the particular case, and in other cases to vary directly as the height: in a greater or less degree a similar action obtained in every case in which the ultimate angle of repose was not assumed at once. The Author appeared to have had most trouble with silty matter, in this agreeing with the experience of all engineers, and also where water had free access, and where the mass of the backing might be assumed t...
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