Does anyone know if the constrained soil modulus (Ms) used to compute deflection of buried flexible pipe (Spangler's formula) is the same Ms used in settlement/consolidation analyses? The buried pipe calculation is detailed in AWWA manual, AASHTO LRFD, etc.--a screenshot of the AASHTO formulation is below. I would think that these parameters, despite having the same name, are different unless the soil is isotropic. Ms in the Spangler formula represents the constrained stiffness of the soil to sides of the buried pipe (i.e. lateral stiffness. Wouldn't most soils exhibit a different constrained stiffness under vertical loads, such as in settlement analysis? Can anyone here advise on relating these properties?
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