Measurements plotted against shear strain (%) from drained triaxial shearing tests performed on LBS 1·0–2·0 (tests 7–11): (a) boundary work (J); (b) distortional work (J); (c) volumetric work (J); (d) cumulative AE (RDC); (e) AE generated per increment of boundary work (RDC/J); (f) cumulative AE (RDC) plotted against cumulative boundary work (J) relationships