Where : e _ { max } is the " maximum void ratio " corresponding to a very loose state, e _ { min } is the " minimum void ratio " corresponding to a very dense state and e is the " in situ " void ratio.
12.
Additional criticisms are that the theory is " only descriptive, " i . e ., only describes known behavior and lacking the ability to either explain or predict standard soil behaviors such as, why the void ratio in a one dimensional compression test varies linearly with the logarithm of the vertical effective stress.
13.
A key point in their analysis is the use of the Bigoni & Piccolroaz yield surface, previously developed, see Fig . 3 . Fig . 4 A mechanical model of ceramic forming correctly predicts : ( left ) the load / displacement curve during cold pressing, ( centre ) the density ( void ratio ) map within a formed piece and ( right ) the dark annular region evidenced on the bottom of a formed piece.
14.
Additionally DSSM explains key relationships in soil mechanics that to date have simply been taken for granted, for example, why normalized undrained peak shear strengths vary with the log of the over consolidation ratio and why stress strain curves normalize with the initial effective confining stress; and why in one-dimensional consolidation the void ratio must vary with the log of the effective vertical stress, why the end-of-primary curve is unique for static load increments, and why the ratio of the creep value C? to the compression index Cc must be approximately constant for a wide range of soils.
