For structures supported on foundations that bear on sandy soils, it is presumed that the major portion of expected settlement occurs upon application of loading; the practical effect is that total settlement can take place by the end of the time period required to complete the construction.However, there is a major exception to this statement; indicate this condition.
For structures supported on foundations that bear on sandy soils, it is presumed that the major portion of expected settlement occurs upon application of loading; the practical effect is that total settlement can take place by the end of the time period required to complete the construction.
However, there is a major exception to this statement; indicate this condition.
Vertical settlement of soil: It is a fact that when a material is stressed, it undergoes some strain. So, the soil is also not a exception and hence, when a load is applied on soil due to construction of structures, then soil undergoes change in its volume due to rearrangement of its particles and expulsion of pore water present in the soil.. So, this volume change causes the vertical downward displacement, which shows itself as the settlement of the structure resting over the soil.
The total vertical displacement or deformation of a soil layer under stress is directly proportional to the three factors:
- the compressibility of the soil
- The magnitude of stress increase
- the volume of soil or thickness of the soil layer.
Among all the three factors, compressibility is important property of soil, while the second factor is a loading condition and the third one is a sub-soil boundary condition.
The compressibility of a soil is basically a soil property which directly depends upon the permeability of soils and is defined as the amount of deformation per unit increase in stress. So, we can say that if a soil is more permeable, then it is more compressible and vice-versa.
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