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snakesonabrain / groundhog

Groundhog, a general-purpose geotechnical library
GNU General Public License v3.0
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Inconsitancies between plot_robertson_chart and behaviourindex_pcpt_robertsonwride #39

Open BergJul opened 9 months ago

BergJul commented 9 months ago

_plot_robertsonchart uses the simple normalization Qt, which applies well to clay-like soils. For sand-like soils, inconsistencies can be observed between _plot_robertsonchart and _behaviourindex_pcptrobertsonwride. This is due to soil behaviour type index (Ic) calculated using Qtn.

As suggested by Robertson (2019), it could be more coherent plotting normalized SBTn charts according to Qtn instead of Qt. _plot_robertsonchart can evolve by giving a plotting option between Qt or Qtn.

snakesonabrain commented 9 months ago

Thanks for the comment. I will change the plotting but will also include in the docstrong that the correlation behaviourindex_pcpt_robertsonwride needs to be executed before plotting with Qtn.