Transcription of 10. CONSOLIDATION
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10. CONSOLIDATION
10-1 10. CONSOLIDATION INFLUENCE OF DRAINAGE ON RATE OF SETTLEMENT When a saturated stratum of sandy soil is subjected to a stress increase, such as that caused by the erection of a building on the ground surface, the pore water pressure is increased. This increase in pore pressure leads to drainage of some water from the voids of the soil. Because of the relatively high permeability of the sandy soil this drainage process will occur quite quickly. In other words the pore pressure increase will dissipate rapidly. As a consequence of the drainage of some water from the soil, volume change will occur and settlement will take place.
underlying rock is pervious, through the lower boundary as well. This drainage of water will continue until the pore pressure distribution coincides with that which existed before the surface stress was applied as shown in Fig. 10.2(c). This means that the stress ∆σ which was originally
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