ABSTRACT
Similar types of equations as presented for general shear failure can be developed for local shear failure also.
Transition from Local to General Shear Failure in Sand As already explained, local shear failure normally occurs in loose and general shear failure occurs in dense sand. There is a transition from local to general shear failure as the state of sand changes
" ~
~ ~ 80~0 ... u ~ 0 '0
40~
028 30 32 34 36 38 40 42 44 46 Angle of internal friction, ¢
Figure 12.8 Terzaghi's bearing capacity factors which take care of mixed state of local and general shear failures in sand (Peck et al., 1974)
from loose to dense condition. There is no bearing capacity equation to account for this transition from loose to dense state. Peck et aI., (1974) have given curves for N r and Nq which automatically incorporate allowance for the mixed state of local and general shear failures as shown in Fig. 12.8.
