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عمران::
خاک پی
Such a condition will ultimately result in seepage into expansive subgrades or foundation soils.
• If the backfill material is too permeable the overexcavation zone may serve as a reservoir and provide a long-term source of water to the foundation soils and bedrock.
The concept behind this treatment method assumes that increasing the water content in the expansive foundation soils will cause heave to occur prior to construction, thereby reducing post- construction expansion potential.
Because the root cause of soil expansion is an increase in water content of the foundation soils, it would appear that in order to eliminate prob- lems of heave one would only have to control the water content of the soil.
However, it is virtually impossible to prevent an increase in water content of the foundation soils after site development.
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