Problem description

When using the Sensitivity Analysis and Parameter Variation application (SensiPar), this application will send the parameter values that will be varied to the Input application. Unfortunately, in PLAXIS 2D 2015, the SensiPar application will send the new parameter value to Plaxis Input in a rounded format with two digits.

Table 1. Examples of rounding in SensiPar 2015

value in SensiPar	value send to Input
1E3	1000.00
1.8E5	180000.00
0.5	0.50
0.495	0.50
1E-3	0.00

 

As you can see above, values smaller than 0.01 will be rounded to zero. This will be problematic for small values (< 0.01), for example these parameters:

• permeability values for low permeable soils;
• HS small’s threshold shear strain: γ_0.7 ;
• stiffness parameters for the Soft Soil and Soft Soil Creep model: κ*, λ* and μ* .

Also other small parameter values, like Poisson’s ratio and K₀^nc, can be rounded incorrectly because of this issue.

Solution

This issue is now solved in PLAXIS 2D 2016.00