design suction envelope for drilled shafts in expansive soil...
TRANSCRIPT
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Design Suction Envelope for Drilled Shafts in Expansive Soil
Robert L. Lytton
Professor, Fred J. Benson Endowed ChairZachry Department of Civil Engineering
Texas A&M UniversityTexas A&M University
Foundation Performance Association Houston, Texas
December 11, 2013
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UPLIFT
OREINFORCING MOVEMENT ACTIVE ZONE
ANCHORZONE
2
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Load
SHRINKAGESHRINKAGE
MOVEMENTMOVEMENT ACTIVE ZONE
ANCHORZONEZONE
BEARING
3
BEARING CAPACITY
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Thornthwaite Moisture Index (TMI, 1948)Thornthwaite Moisture Index (TMI, 1948)
100 60R DEFTMIE
pE
R = runoff moisture depthDEF =deficit moisture depthpEp = evapotranspiration
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Suction Distribution with DepthSuction Distribution with Depth(-) Suction Ground Surface
Wet Season
E ilib i
Dry Season
Equilibrium
Dep
th
Dry Season
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0.00 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Soil Suction, pF
5.0
10.0
15.0
20.0
epth
, ft.
25.0
30.0
De
35.0
40.0
66
45.0Copyright John T. Bryant (2008)
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Figure 1 - Total Soil Suction Histogram for 2006
1000
700
800
900
500
600
Freq
uenc
y
200
300
400
F
0
100
200
2 6 2 7 2 8 2 9 3 3 1 3 2 3 3 3 4 3 5 3 6 3 7 3 8 3 9 4 4 1 4 2 4 3 4 4 4 5 4 6 More
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2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4 4.1 4.2 4.3 4.4 4.5 4.6 More
Total Soil Suction, pF
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Field ConditionsField Conditions
pF Wilting point 4.5 pFField capacity Equilibrium
e 3.5633exp( 0.0051TMI)U
0
2
2.0 3.0 4.0 5.0
Root zone2
4
6ft 6
8
10
Dept
h (f
Moisture active zone
12
14
8
0( ) exp -e
nU Z U U Z
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Suction Distribution with DepthSuction Distribution with Depth(-) Suction Ground SurfaceSoil Sample
Wet Season
E ilib i
Dry Season
Equilibrium
Dep
th
Dry Season
How do you find the envelope?envelope?
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Thornthwaite Moisture Index (TMI, 1948)Thornthwaite Moisture Index (TMI, 1948)
100 60R DEFTMIE
pE
R = runoff moisture depthDEF =deficit moisture depthpEp = evapotranspiration
15
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Mean Surface Suction, pF
4
5
, p
4.5
2
3
43.0 3.3
3.0
0
1
2
J F M A M J J A S O N D
0
Month
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Surface suction variation with timeSuction variation with depth and timeare predicted with Fourier Series
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Suction envelopes are also predicted with Fourier Series
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Demonstration of suction envelope spreadsheet
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Suction Distribution with DepthSuction Distribution with Depth(-) Suction Ground SurfaceSoil Sample
Wet Season
E ilib i
Dry Season
Equilibrium
Dep
th
Dry Season
How do you find the envelope?envelope?
23
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Design Suction Envelope for Drilled Shafts in Expansive Soil
Robert L. Lytton
Professor, Fred J. Benson Endowed ChairZachry Department of Civil Engineering
Texas A&M UniversityTexas A&M University
Foundation Performance Association Houston, Texas
December 11, 2013