Updating Bearing Capacity – SPT Graphs - Maryland State Highway ...
Updating Bearing Capacity – SPT Graphs - Maryland State Highway ...
Updating Bearing Capacity – SPT Graphs - Maryland State Highway ...
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thus the AASHTO equation will be:q ult= c5. 14 + γDby neglecting γD, the equation will beq ult= 5. 14cFor clay of high plasticity:( 0.13N) 0. Nq ult= 5 .14 = 668 tsf= 1336N psfFor clay of medium plasticity:q ult = 5.14 (0.076N)= 0.391N tsf= 782N psfFor clay of low plastic and clayey silts:q ult = 5.14 (0.038N)= 0.195N tsf= 390N psfFigure 4.4 and Table 4.3 show the ultimate bearing capacity as a function of <strong>SPT</strong> N-value for awall footing.TABLE 4.3 Ultimate <strong>Bearing</strong> <strong>Capacity</strong> as a Function of <strong>SPT</strong> N-value for a Wall FootingSoil Type Range of q ult in psf Average of q ult in psfClays of High Plasticity (CH) (1059 to 1613) N 1336 NClays of Medium Plasticity (CL) (505 to 1059) N 782 NClays of Low Plasticity and Clayey Silt (SC-ML) (275 to 505) N 390 N4-7
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