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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

-

hydraulic gradient

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

-

hydraulic gradient

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.

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