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 | - | ||
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).