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 SPT N-value for awall footing.TABLE 4.3 Ultimate Bearing Capacity as a Function of SPT 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
Presumptive Ultimate Bearing Capacity, qult psf40,00035,00030,00025,00020,00015,00010,0005,0000Wall footing on Cohesive Soilsq q FSall=ultCHCLSC-ML0 5 10 15 20 25 30 35 40Standard Penetration Resistance, blows/ftNote: Settlement was not considered in the graph.Fig. 4.4Ultimate Bearing Capacity as a function of N-value for a wall footing4-8
Page 1: UPDATING BEARING CAPACITY - SPT GRA
Page 4 and 5: SUMMARYThe graphs used by the Maryl
Page 6: 90x1 and x2 factors x1 and x2 facto
Page 9 and 10: LIST OF TABLESTablePage2.1 Angle of
Page 11 and 12: CHAPTER IINTRODUCTION1.1 General Ov
Page 13 and 14: Fig. 1.2Maryland SHA graphs for cla
Page 15 and 16: CHAPTER IISOIL PROPERTIES FROM SPT
Page 17 and 18: Fig. 2.1Correlation between frictio
Page 19 and 20: The Japanese “Road Bridge Specifi
Page 21 and 22: Fig. 2.3Relationship between SPT N-
Page 23 and 24: CHAPTER IIIAVAILABLE BEARING CAPACI
Page 25 and 26: q ult(AASHTO 4.4.7.1-1)= cNc+ 0.5γ
Page 27 and 28: TABLE 3.3 AASHTO Expressions for Fo
Page 29 and 30: 90807060Wall Footing on Granular So
Page 31 and 32: x1 and x2 factors180160140120100806
Page 33: q ult= γ 1x 1D + γ 2x 2Bwhere γ
Page 37 and 38: = 466N psfFigure 4.5 and Table 4.4
Page 39 and 40: CHAPTER VAPPLICATIONS OF CURRENT AN
Page 41 and 42: Fig. 5.1 Comparison between the cur
Page 43 and 44: Fig. 5.2 Comparison between the cur
Page 45 and 46: REFERENCESMcGregor, J.A. and Duncan
Page 47 and 48: A.1. x 1 and x 2 factors as a funct
Page 49: APPENDIX BShear Strength vs. SPT-va

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