By Malcolm Bolton (auth.)
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Extra info for A Guide to Soil Mechanics
CONSTITUTION OF SOIL 23 The clay minerals can be chemically sensitive: the adding of calcium to a 'heavy' clay soil has long been known to offer the hope of reducing the compressibility, and therefore the swelling and softening of the soil, making it easier to work for the farmer. The friction resistance of a soil is so dependent, as we shall see, on the density, arrangement, and surface roughness of the individual grains, that differences in the fundamental crystal-to-crystal coefficient of friction do not have such a large effect on the overall value.
11). We will make the calculations using gauge pressures relative to atmospheric pressure. The water pressure at Pis simply U ='Ywh But what is the total soil pressure which the water is tending to buoy up? 1, in order to find the total vertical stress at its base. Whereas we obtained u ='YwZ for water we will obtain av ='YZ for the heavier soil. The only significant doubt arises from possible friction on the sides slzl and s2z2: might not the neighbouring soil columns support our central column by offering it upward friction at its edges?
By doing this they hope to avoid the worst of the fluctuating zone. Before we leave the topic of suction we should consider the enormously severe effects of dry air when it is allowed to 'steal' water from the soil. If a block of soil is exposed on a table in a room where the air is not saturated, only a relative suction in the water can prevent its total evaporation. 4) In a centrally heated living room in winter RH may be 0. 9. 99 are assumed, you will see that the potential suction is -1500 kN/m 2 (15 atmospheres, or 150m of water).
A Guide to Soil Mechanics by Malcolm Bolton (auth.)
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