Procedure

1) The reference stress sr shall be equal to the vertical silo pressure. Sample preparation shall be carried out according to the guidelines given in B6.

2) The maximum shear stress tf developed before a horizontal displacement of w = 0,05 D is attained shall be used to calculate the material strength parameters.

3) At least two tests shall be carried out (Table B1 and Figure B4). One sample shall be sheared when loaded at the reference stress, the other shall be sheared at half the reference stress after pre-loading to the reference stress. Stresses determined from the two tests are named in Table B1.

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