By Malcolm Bolton (auth.)
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Additional resources for A Guide to Soil Mechanics
Although Darcy's law has proved very useful in the solution of engineering problems, it contains within it one of the most variable, unreliable, and unmeasurable, 'constants' ever imagined, permeability k. 1. 1 Permeability k(m/s) 10 -1 10 -2 10 -3 10 -4 10 -s 10 -6 10 -1 10 -s 10 -9 10 -10 10 -11 10 -12 pebble beds sands silts clays cemented sandstones gravels fissured mudstones jointed, fissured granite intact granite magnitude, permeability covers the same range of magnitudes of velocity as are covered in the comparison between the sizes of an orange and the solar system.
Compared with the weight of a swimmer, for example, the force due to surface tension is negligible. It only becomes important when considering the behaviour of small volumes of water, when the weight of the water is reduced by perhaps the third power of the scale while the perimeter (governing the surface tension) is only scaled down linearly. 3). The air at points A and C is at atmospheric pressure, or zero gauge pressure. The surface of the water in the region of C is plane, so that the gauge pressure u in water at D must also be zero if it is to be stationary.
001 mm (representing a uniform fine silt) he =30m: if a pure clay were thought to have effective void sizes of 10- 5 mm then its capillary rise becomes almost unimaginably large. Of course, the imaginative leap between capillary tubes and the pattern of connected voids in a soil leaves much to be desired. Perhaps fortunately, the need to specialise this simple model is eroded away by three inescapable complications which assail soil in the field: these are the downward percolation of rainwater, the evaporation of groundwater into a relatively dry atmosphere, and the very slow rate of flow of water in fmcgrained soils.
A Guide to Soil Mechanics by Malcolm Bolton (auth.)