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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4.3.2 Square FootingThe AASHTO equationq 0+ qNult= cNcscbcic+ .5γBNγsγbγiγqsqbqiqwill have: i) for ϕ = 0, N c = 5.14, N q = 1.0 and N γ = 0.0⎛ 1.0 ⎞ii) sc= 1 + ⎜ ⎟ = 1. 195 , s q = 1, s γ = 1 <strong>–</strong> 0.4 = 0.6⎝ 5.14 ⎠iii) i c = i q = i γ = 1 for vertical loadandiv) b c = b q = b γ = 1 for horizontal basethus the AASHTO equation will be:q ult( ) + γD= c5.14 1. 195q ult= 6 . 14c+ γDby neglecting γD, the equation will beq ult= 6. 14cFor clay of high plasticity:( 0.13N) 0. Nq ult= 6 .14 = 798 tsf= 1596N psfFor clay of medium plasticity:( 0.076N) 0. Nq ult= 6 .14 = 467 tsf= 934N psfFor clay of low plasticity and clayey silts( 0.038N) 0. Nq ult= 6 .14 = 233 tsf4-9
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