By Malcolm Bolton (auth.)
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Additional info for A Guide to Soil Mechanics
In the circumstances the foundation engineer had a great deal of sympathy for the builder, who seemed to have made a good job of the design and construction of the houses. In almost all circumstances John Doe would have found his bungalow very satisfactory. 8 m below ground. On the other hand differential settlement was not inevitable. 8 tonnes/m 3 , which is 121 tonnes. By compensating for the weight of the structure in this way, the underlying soils are not compressed any further than they were before building started.
The effective stress, of vital significance in settlement and friction calculations, is then the difference between the two. 3 Suction Water pressures can be smaller than the pressure of neighbouring atmospheric air. They can even be smaller by a margin that is greater than one atmospheric pressure. In other words not only can gauge water pressures be negative, but also absolute water pressures can be negative: water can carry tension. The source of this surpri-sing ability is 'surface tension'.
2) The use of gauge pressures will greatly simplify calculations, since the almost· constant atmospheric pressure invariably permeates every void in the soil and its effect is therefore nil. As an example, the upholstery trade would not be affected by a doubling of the atmospheric pressure since the extra air pressure which tended to compress the springs in the mattress even before the customer lay down would be exactly balanced by extra support from the selfsame pressure, which would have found its way into the mattress to support the load even before the springs were compressed.