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Calculations

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Calculations
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11/28/2011
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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)


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