By Malcolm Bolton (auth.)
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Additional info for A Guide to Soil Mechanics
The disc of peat was confined in a steel tube in such a way that pressure could be applied to the top surface while water could drain out of the soil as it would out of a sponge as the soil skeleton consolidated. After the sample had been submerged in water to stop it drying, an initial pressure was applied to it which was intended to duplicate the weight of earth that was compressing the soil sample in its natural position. To estimate this initial pressure, the engineer applied the most significant principle in the mechanics of soil, the effective stress concept.
___- ·- capillary tube · ·Of equivalent · · :pore diameter A simple case of suction in sandy ground table. Above the saturated capillary zone there will be a partially saturated zone whose surface will be dried in summer and wetted in winter. The pore-air and pore-water pressures in this zone will be quite variable and unpredictable: this in turn makes effective stress analysis for strength or settlement very difficult. Engineers normally dig their foundations at or below a depth of 1 m. By doing this they hope to avoid the worst of the fluctuating zone.
Nor has it much effect on the weight of a soil body. 8 kN/m 3 . I kN/m 3 . In this book I shall use the symbols and values, Pw = 1000 kg/m 3 = I tonne/m 3 , 'Yw = IO kN/m 3 , so as to simplify arithmetic without sacrificing much accuracy. 8, so that solid rock can be expected to have a density of roughly 2700 kg/m 3 and a unit weight of roughly 27 kN/m 3 . Porous rock (or soil) clearly does not weigh as much as this. 50. If the soil is perfectly dry, and the voids are full of air, then the density of the soil is 2700 x 1/(1 + 05) or 1800 kg/m 3 .
A Guide to Soil Mechanics by Malcolm Bolton (auth.)