A Guide to Soil Mechanics by Malcolm Bolton (auth.)

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By Malcolm Bolton (auth.)

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Unfortunately, this situation is outside the scope of my authority. Water simply does not flow from high pressure to low pres~ure, otherwise a beaker of water would be in a constant turmoil as the high-pressure water at the bottom attempted to flow upwards towards the surface. Flow depends on relative heads, not on gauge pressures. On the other hand, the solutions to problems involving the equilibrium of soil or other structures will depend on actual water pressures, irrespective of whether the pressures have been expressed as heads above sea level in metres, or heads above the centre of the Earth in kilometres.

The most powerful way of dealing with this buoyancy, however, is to account for water pressures from first principles rather than by using Archimedes' principle on individual soil particles. 2 which is at a depth z level ground y= 19 kN/m 3 y=20kN/m 3 z . 2 Ground and water at rest beneath ground level and h beneath the water table under a large flat field. The most likely source of information about soil densities will come from the weighing of borehole samples of known volumes, so let us suppose that these weighings indicate unit weights of 19 kN/m 3 in the moist soil above the water table and 20 kN/m 3 in the saturated soil beneath the water table.

400 g of the natural wet soil are washed through a nest of sieves. 6 Draw the grading curve, and describe the likely nature of the soil. List the differences in technique between the test described in BS 1377 and that described above, and remark on the merits of each of them. (4) A silty clay encountered in a deep excavation is found to have a moisture content of 20 per cent. Guess its void ratio and bulk density, remarking on your assumption. 1 Water in the Ground Water exists in the ground above sea level because the Sun evaporates an estimated 5 x 1014 tonnes of water every year, 20 per cent of which falls back over the land as snow and rain.

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