Drainage is a key consideration when designing earthworks, including reinforced soil structures, using compacted clay fill.
Ground movement and soil slope instability can be caused by changes in total stress and also by changes in pore pressure, such as after rainfall, when pore pressure can increase.
The difference between total stress and pore pressure is the ‘effective stress’, which controls soil behaviour, such as shear strength, compression and deformation. Effective stress is therefore a measure of how much load a soil can carry.
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