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where:

σ_or,i

-

vertical component of geostatic stress in the middle of i^th layer

σ_z,i

-

vertical component of incremental stress (e.g. stress due to structure surcharge) inducing layer compression

j_i

-

stress exponent in the i^th layer

m_i

-

Janbu modulus in the i^th layer

h_i

-

thickness of the i^th layer