Of which:σho: the total of the initial horizontal pressureCU. soil: shear strength of weak soil drainage not around pileEU. soil, νu. soil: water drainage and no elastic modun poisson of weak soil, is determined by the compression test three axes do not drain.When the ν = 0.5 (with case σho = σvo) and when 55Cusoil = Eusoil then:
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