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Analysis of Seismic Bearing Capacity

Seismic bearing capacity of shallow foundation is calculated according to the following formula:

where:

pLE

-

seismic bearing capacity

c

-

cohesion of soil

γ

unit weight of soil

d

depth of footing bottom

B

width of foundation

NCE, NqE, NγE

-

seismic bearing factors

where:

KAE, KPE

-

seismic coefficients of earth pressures

ρAE

-

angle of failure

φ

angle of internal friction

where:

kh

-

seismic coefficient of horizontal acceleration

kv

-

seismic coefficient of vertical acceleration

Note: If the angle α is negative, i.e. φ < θ, then the seismic bearing capacity is pLE = 0.

References:

Richards Jr., R.; et al. SEISMIC BEARING CAPACITY AND SETTLEMENTS OF FOUNDATION. J.Geotech. Engrg. 1993, 4 (119)

Das, B. M. Principles of Soil Dynamics, 3rd ed.; California State University: Sacramento, 2016.

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