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GEO5 software

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Coefficient of Lateral Earth Pressure K

Coefficient of lateral earth pressure K can be calculated as follows:

where:

φef

-

effective angle of internal friction

OCR

-

overconsolidation ratio

σef,p

-

vertical effective pre-consolidation stress

σef,v

-

effective vertical stress

Kp

-

coefficient of the passive earth pressure

Vertical effective pre-consolidation stress is considered as follows:

  • for sandy soils (according to the Mayne 2007):

  • for gravelly soils (according to the Kulhawy and Chen 2007):

where:

N60

-

correlated number of blows

m

-

dimensionless coefficient (m=0.6 for clean sands, m=0.8 for clayey to dusty sands)

pa

-

atmospheric pressure

Atmospheric pressure pa is automatically considered by the program as 101 kPa (2116 psf).

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