Shallow Foundation - Limit Bearing Capacity
Meyerhof and Salgado Method
MB
Limit Bearing Capacity, qbL 2784 kPa PV
Allowable Bearing Capacity, qALLOW 2784 kPa
PH
Maximum Allowable Column Load, PV 16706.9 kN
SI or British Units? 0 Type 0 for SI, 1 for British
Unit Weight of Water 9.81 kN/m3
From Geotechnical Engineer gabove w.t. Df DW
c (or Su0 at the base of the foundation) 0 kPa
Unit increase rate of Su, d Su/d z = r 0 kPa/m
gSAT below w.t.
f 36.4 degrees
Depth to Water Table (W.T.), DW 2.0 m Shear Strengths, c, f'
Soil Unit Weight above W.T., g 20.0 kN/m3 B
Saturated Unit Weight below W.T., gSAT 22.0 kN/m3
Estimating f
fP (Recommended) 36.4
1.8
fC 32
s'mp 744.5 kPa
1.6
PATM 101.325 kPa
Relative Density, DR 70 %
FROUGH
1.4
Ay 3.17
Q 10
1.2
RQ 1
fD 4.4
1
0 1 2 3 4 5
From Structural Engineer (r B)/Suo 0.2 0.16 0.12 0.08 0.04 0
su o/(r B)
QV 150.0 kN
QHB 0.0 kN
QHL 0.0 kN
QH 0.0 kN
Angle of inclination, qB 0.0 degrees
mB 0.0
Angle of inclination, qL 0.0 degrees
mL 0.0
m 0.0
Moment in B direction 0.0 kN-m
Eccentricity, eB 0.0 m
Moment in L direction 0.0 kN-m
Eccentricity, eL 0.0 m
Shallow Foundation Computations
B 2 m
L 3 m
B/L 0.667
Circle? 0 (use 0 for no, yes for 1)
D (or Df) 0.75 m
B' 2.00 m
L' 3.00 m
B'/L' 0.667
Factor of Safety, F 1 (normally use 3)
Shallow? OK
Limit Bearing Capacity Computations
Nc 52.53
rB/Su0 0.00
Frough 1.00
ssu 1.23
C1 (used in computing ssu) 0.139
C2 (used in computing ssu) 0.217
dc 1.17
ic 1.00
(c Nc) term: 0 kPa
(c Nc ssu dsu isu) term: 0 kPa
cNc(ssudsuisu) + q0: 0 kPa
q 15.0 kPa
Nq (Eq. 10-6) 39.7
sq 1.95
dq 1.68
iq 1.00
qNq term: 596 kPa
(q Nq sq dq iq) term: 1954 kPa
Ng (Eq. 10.13) 43.1
g (Eq. 10.42) 17.1 kN/m3 12.19
sg 1.13
dg 1.00
ig 1.00
(0.5 g B Ng sg dg ig) term: 831 kPa
Kp (or flow number, N) 3.92 `
Kp^0.5 1.980
B 6 ft
L 6 ft
B/L 1.00
D 3 ft
D/B 0.5
B/L C1 C2 C1 C2 D/B Real Ci Proposed
1 0.163 0.210 Circle 0.126 0.219 0 1.125 1.126
1 0.125 0.219 Square 0.2 1.223 1.224
0.5 0.156 0.173 0.4 1.264 1.265
0.33 0.159 0.137 0.6 1.295 1.296
0.25 0.172 0.110 0.8 1.321 1.322
0.2 0.190 0.090 1 1.344 1.345
1.2 1.365 1.366
1.4 1.384 1.385
1.6 1.402 1.403
1.8 1.419 1.420
2 1.435 1.436
2.2 1.450 1.451
2.4 1.464 1.465
2.6 1.478 1.479
2.8 1.491 1.493
3 1.504 1.505
0.2500 0.2000 0.1500
(r B)/Su0 FROUGH (r B)/Su0 FROUGH (r B)/Su0 FROUGH (r B)/Su0
0.0664 1.0017 0.00 1.001447 A 1.001447 0.0004 1.0172 0.2000
0.3874 1.1037 0.50 1.121753 B 0.270648 0.0035 1.1072 0.1950
0.4052 1.1062 1.00 1.215715 C -0.06394 0.0066 1.2072 0.1900
0.6906 1.1685 1.50 1.288474 D 0.007916 0.0097 1.3134 0.1850
0.7262 1.176 2.00 1.344641 E -0.00035 0.0137 1.4421 0.1800
0.9937 1.2183 2.50 1.388296 0.0172 1.5658 0.1750
1.1364 1.2382 3.00 1.422988 0.0199 1.6471 0.1700
1.3504 1.2681 3.50 1.451738 0.0203 1.6496 0.1650
1.7784 1.3104 4.00 1.477033 0.0305 1.6833 0.1600
2.1530 1.3527 4.50 1.500832 0.0395 1.7083 0.1550
2.2421 1.3652 5.00 1.524564 0.0398 1.7083 0.1500
2.6702 1.3976 5.56 1.551926 0.0615 1.7008 0.1450
3.0982 1.4299 6.25 1.588181 0.0633 1.6983 0.1400
4.1504 1.4897 7.14 1.636465 0.0770 1.6808 0.1350
4.9886 1.5295 8.33 1.691834 0.0968 1.6558 0.1300
6.4154 1.5967 10.00 1.693067 0.1157 1.6308 0.1250
7.1644 1.6341 12.50 1.220374 0.1393 1.6021 0.1200
7.6459 1.659 16.67 -2.88874 0.1610 1.5758 0.1150
8.5020 1.7013 25.00 -46.6475 0.1811 1.5508 0.1100
9.1083 1.7088 50.00 -1365.98 0.1997 1.5271 0.1050
0.1997 1.5271 0.1000
1.8000 0.0950
0.0900
1.8
1.7000 0.0850
1.7 0.0800
1.6000 0.0750
1.6 0.0700
1.5000
0.0650
1.5 0.0600
1.4000
0.0550
1.4
1.3000 0.0500
1.3 0.0450
1.2000 0.0400
1.2 0.0350
1.1000
0.0300
1.1 0.0250
1.0000
0.1500 0.1000 0.0500 0.0000 0.0200
1
0.0150
0 2 4 6 8 10 0.0100
0.0050
0.0000
FROUGH
1.5264 A 0.948425
1.5366 B 54.6281
1.5433 C -1442.46
1.5481 D 18409.85
1.5523 E -123931 Equation Y = 0.9484253284 + 54.62809737 * X - 1442
1.5566 F 421512
1.5616 G -570657
1.5673
1.5739
1.5811
1.5888
1.5967
1.6045
1.6120
1.6190
1.6252
1.6308
1.6357
1.6400
1.6440
1.6478
1.6519
1.6564
1.6618
1.6682
1.6758
1.6846
1.6945
1.7048
1.7148
1.7231
1.7282
1.7274
1.7178
1.6956
1.6558
1.5928
1.4995
1.3677
1.1877
0.9484
53284 + 54.62809737 * X - 1442.460145 * pow(X,2) + 18409.84526 * pow(X,3) - 123931.1155 * pow(X,4) + 421511.9716 * pow(X,5) - 57065
.9716 * pow(X,5) - 570656.944 * pow(X,6)