I&B 2008 calculation properties
For the Idriss & Boulanger (2008) calculation method a set of options are available.
•Fines estimation: For the determination of the apparent fines content the default method is the use of the R&W formula. The second option is the use of the formula I&B proposed on their 2008 monograph publication and a last option where the user can define a custom fines profile. For the I&B formula further customization can be fone by clicking the wrench button.
•I&B clay-like behavior: When checked the software will perform the cyclic softening calculation for clayey soils (CPT points with Ic > Ic cutoff value) otherwise only sand points will be tested for cyclic liquefaction. This option is also used for the Boulanger & Idriss 2014 method
•Maximum vol. strain for clay like behavior: If enabled the software will apply the provided post liquefaction volumetric strain value for clay like soils in the vertical settlements calculation procedure otherwise clay-like soils are excluded from the calculation.
•Assume void redistribution negligible: Idriss & Boulanger (2008) provide two curves to estimate liquefied strength ratio. When this option is checked, the curve based on negligible void redistribution is used
•Settlements according to Zhang et al.: If check the software will make use of the Zhang et al. (2002) formulas for settlements estimations rather than the one proposed by I&B (2008). This option also applies to
•Limit gamma for LDI to 50%: According to I&B limiting shear strain can be reduced to 50% when performing LDI calculation