03we Bond Worked Example T Shaped Gravity Wall
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Transcript of 03we Bond Worked Example T Shaped Gravity Wall
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Background & Applications
GEOTECHNICAL DESIGN wi th worked examples 13-14 June 2013, Dubli n
T-shaped gravity wall
Dr Andrew Bond
Director, Geocentrix Ltd
Chairman TC250/SC7
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Background & Applications
GEOTECHNICAL DESIGN wi th worked examples 13-14 June 2013, Dubli n
Worked example T-sha ed ravit wall
DESIGN SITUATION
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Background & Applications
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Design situation for gravity wall example
2005-13 Geocentrix Ltd. All rights reserved3
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Earth pressure theory
Use Rankines equation for Ka:
= +
2 2
,2 2
a
cos cos cosK cos
cos cos cos
Horizontal and vertical component of Ka are:
= , ,a h aK K cos
= = , , ,sin tana v a a hK K K
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Some numbers to save you time...
Self-weight of wall stem
= , ,stem k c k s
W t H
Self-weight of wall base
= =25 0.7 6 105 N m
= , ,base k c k b
W t B
= =25 0.8 3.9 78 kN m
Self-weight of backfill +
=
,2
f
fill k k heel W b
+= =
6 6.8219 2.25 274
2kN m
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Bearing capacity coefficients
Nq
Nq
. .
21 7.1 31 20.6
22 7.8 32 23.2
23 8.7 33 26.1
24 9.6 34 29.4
25 10.7 35 33.3
26 11.9 36 37.8
. .
28 14.7 38 48.9
29 16.4 39 56.0
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Worksheet T-shaped gravity wall
Calculate:
2. Moments about wall toe, thedetermine eccentricity of
3. Bearing resistance undereccentric, inclined loads
.
5. Toppling resistance
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Background & Applications
GEOTECHNICAL DESIGN wi th worked examples 13-14 June 2013, Dubli n
Worked example T-sha ed ravit wall
SOLUTION
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Solutions DA1/DA2* T-shaped gravity wall
Verification DA1 DA2* Traditional
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Sliding 66% 85% 99% Fs = 1.52
Bearing 125% 230% 93% Fb = 2.03
Eccentricity 0.92 m 0.64 m 0.42 m Same asDA2*Effective width 2.05 m 2.63 m 3.06 m
Toppling 31% 31% 31% FO = 4.35
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Summary of key points
DA2* requires a wall base of width B 3.9 m
= =
DA1 requires a wall base of width B 5.1 m
qu va en o ra onas
= . anb
= .
Main difference between DAs 1 and 2* is bearing resistance
Calculated load eccentricity is very different
Effective width is much smaller in DA1
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blo .eurocode7.com
www.decodingeurocode2.com
www.decodin eurocode7.com
DECODING THE EUROCODES
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