Geoslope E994 Convergence problem

LaureE
LaureE Posts: 2
in GeoStudio

Hello,

In the case of a levee with multiple rows of anchors embedded in chalk, I perform a stability calculation by imposing a failure plane.

My slope calculation does not converge (E994). I have tested different approaches: linear search and root finder.

In the convergence graph, lambda never exceeds 0.2.
Can it go beyond this value? If so, how? I have specified multiple values in the "lambda values" field.

Is it possible that this error appears when the stability is infinite, as in Talren? Indeed, when I remove one row of anchors, the calculation converges and FSD > 5.

Thank you for your help.

Comments

  • LaureE
    LaureE Posts: 2
    Capture.JPG

    I'm adding this image for information.

  • KathrynDompierre
    KathrynDompierre Posts: 15 mod

    Hello Laure! Yes, the lambda values can go above 0.2.
    The limit equilibrium method struggles with convergence issues when reinforcement is added because of the additional forces being added to the static equations used to generate the Factor of Safety. To get around this, you could try using a SIGMA/W analysis to calculate the stresses in the ground (including structural elements) and then use the FE stresses in a SIGMA/W slope stability analysis (this is a type of SLOPE/W analysis). Alternatively, since you know the factor of safety is 5 when there are less anchors present, then you know that your system will provide enough resistance to movement when all the anchors are present.
    If you would like further technical support, please send your file to support@geoslope.com.

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