This paper compares numerical model predictions and laboratory data on sand production and borehole stability tests. It also compares numerical model predictions and field data on sand production and borehole stability tests. These comparisons show that model predictions agree with both field and laboratory results for sand production problems, however, for borehole stability problems, the model prediction does not necessarily agree with both laboratory and field results. The laboratory results show strong size effect, and the predicted borehole failure conditins lie between those predicted with the non-linear MOhr Coulomb and the non-linear Drucker-Prager. However, the field borehole is generally more stable than the laboratory results and its failure condition is cllose to the value predicted by the non-linear Mohr-Coulomb constitutive theory.
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