24 46 ° 90 °-46 ° 40 20 600 100 σ ’ kN/m 2 τ kN/m 2 Figure Q2.7a: Mohr circle of stress The first plane of maximum stress ratio is horizontal (this is an assumption that has to be made to draw the Mohr circle of stress). From Figure Q2.7a, the second plane of maximum stress ratio is at (90 °- φ ' peak ) = (90- 46 ) = 44 to the horizontal, either clockwise or anticlockwise depending on whether the shear stress on the horizontal plane plots positive or negative. (Note: the answer given in the main text is slightly ambiguous here. The planes of maximum stress ratio are horizontal and either + or - 44 to the horizontal and not, as might be interpreted from the answer given in the main text, + and - 44 to the horizontal). The increments of shear (
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