Failure by Heave and Piping (EN1997-1)
Failure by heave
The stability of soil against heave due to flow of water in the subsoil (HYD) is checked according to the limit states by the equation:
where: | udst | - | unfavourable water pressure |
σstb | - | favourable weight of the soil | |
γh | - | reduction coefficient of a failure by heave |
The stability of the soil against heave due to the flow of water in the subsoil (HYD) is checked according to the factor of safety by the equation:
where: | udst | - | unfavourable water pressure |
σstb | - | favourable weight of the soil | |
SFh | - | safety factor for a failure by heave |
Failure by heave - scheme of sheeting structure
Failure by piping
Failure by piping is checked according to the limit states by the equation:
where: | i | - | |
ic | - | critical hydraulic gradient, where ic = γsu/γw | |
γp | - | reduction coefficient of a internal erosion of soil |
Failure by piping is checked according to the factor of safety by the equation:
where: | i | - | |
ic | - | critical hydraulic gradient, where ic = γsu/γw | |
SFp | - | safety factor for a internal erosion of soil |
Literature:
Eurocode 7: Geotechnical design - Part 1: General rules.