Rate of dissipation of excess pore water pressure in a liquefiable sand deposit

Rate of dissipation of excess pore water pressure in a liquefiable sand deposit is governed by a highly non-linear behavior of soil following liquefaction. A series of one dimensional effective stress analyses of a liquefiable sand deposit is performed to identify a governing factor on the rate of dissipation of excess pore water pressure. The first series of analyses demonstrates that rate of dissipation at smaller excess pore water pressure ratio is faster than that at larger excess pore water pressure ratio. This fact is due to the non-linear relation between the mean effective stress and volumetric strain. Tangential bulk modulus at lower confining stress (i.e. larger excess pore water pressure ratio) is smaller than that at higher confining stress (i.e. smaller excess pore water pressure ratio). The second series of analyses implies that, despite the complexity of non-linear behavior, the governing factor is a time factor, which is similar to that appearing in linear one dimensional consolidation analysis of clay ground.