Design Suction Envelope for Drilled Shafts in Expansive Soil Robert L. Lytton Professor, Fred J. Benson Endowed Chair Zachry Department of Civil Engineering Texas A&M University Texas A&M University Foundation Performance Association Houston, Texas December 11, 2013
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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
UPLIFT
OREINFORCING MOVEMENT ACTIVE ZONE
ANCHORZONE
2
Load
SHRINKAGESHRINKAGE
MOVEMENTMOVEMENT ACTIVE ZONE
ANCHORZONEZONE
BEARING
3
BEARING CAPACITY
Thornthwaite Moisture Index (TMI, 1948)Thornthwaite Moisture Index (TMI, 1948)
100 60R DEFTMIE
pE
R = runoff moisture depthDEF =deficit moisture depthpEp = evapotranspiration
4
Suction Distribution with DepthSuction Distribution with Depth(-) Suction Ground Surface