The Actual Lateral Pressure of EarthworkD. Van Nostrand, 1881 - 180 Seiten |
Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
15 feet 20 feet 9 inches actual lateral pressure angle of resistance base batter bottom brick brickwork built buttresses cent center of pressure coefficient of friction concrete block coping Coulomb's counterforts cubic foot cutting depth docks earth engineer Euston Station excavation experiments face factor of safety failure feet 6 inches feet 9 feet high filling fluid pressure fluid weighing foundation gravel ground heavy height in thickness hydrostatic pressure inches thick instance less Lieutenant Hope limiting angle lineal foot London clay masonry material mean thickness ment Metropolitan District railway Metropolitan railway natural slope ness ordinary overturned paper pier piles practice pressure of earthwork result retaining walls rubble mound sand shingle sliding slip slope of repose soil square foot stability stood perfectly strength struts tained theoretical theory thin wall timber tion tunnel vertical wall vibration West India Dock wet ballast
Beliebte Passagen
Seite 121 - The object of the panel, as of the 1 £ inch to the foot batter which he gives to the wall, is not to save material, for this involves loss of weight and grip on the ground, but to effect a better distribution of pressure on the foundation.
Seite 65 - It is a suggestive fact that, out of the 9 miles of retaining wall on the underground railway, the exceptionally weak wall should show no movement either during or after construction, whilst the exceptionally strong wall, though having six times the stability of the former, should fail. If an engineer has not had some failures with retaining walls, it is merely evidence that his practice has not been sufficiently extensive...
Seite 8 - There is a mathematical theory of the combined action of friction and adhesion in earth ; but for want of experimental data its practical utility is doubtful.
Seite 120 - It has been similarly proved by experience that under no ordinary conditions of surcharge, or heavy backing, is it necessary to make a retaining wall, on a solid foundation, more than double the above, or onehalf of the height in thickness.
Seite 5 - ... enforced itself upon the attention of constructors in the earliest ages. Many of the rudest fortresses doubtless had revetments, and of the hundreds of topes, or sacred mounds, raised in India and Afghanistan two thousand years ago,1 not a few afford examples of surcharged retaining walls on as large a scale as those occurring in modern railway practice. Nevertheless, long as the subject has• occupied the attention of constructors, there is probably none other regarding which there exists the...
Seite 117 - ... latter from equations based upon a number of uncertain assumptions as to the bearing power of the foundations, the resistance to gliding, and other elements. This being so, it has often struck the author that the numerous published tables giving the calculated required thicknesses of retaining walls to three places of decimals, stand really on exactly the same scientific basis, and have the same practical value, as the weather forecasts for the year in Old Moore's Almanack.
Seite 113 - Ibs. in water, and the lateral thrust will be that due to the latter weight. If. however, as is perhaps more frequently the case, the •wall is founded on a porous stratum, the full hydrostatic pressure will act on the base of the wall, and reduce its stability in practical cases by about one.half. Thus, the 30.ton concrete block walls on rubble mounds, at Marseilles and elsewhere, have the stability due to a weight of say 1 30 Ibs. per cubic foot in the air and 66 Ibs. per cubic foot in sea water...