Chance Technical Design Manual

Adhesion factor a for piles with penetration lengths less than 50 m in clay (data from Dennis and Olson, 1983 a & b; Stas and Kulhawy, 1984)

Values of a versus undrained shear strength

VARIATION IN ADHESION FACTOR WITH UNDRAINED SHEAR STRENGTH OF CLAYS [MURTHY (2003)] FIGURE 5-10

VARIATION IN ADHESION FACTOR FROM AMERICAN PETROLEUM INSTITUTE [ASCE (1993B)] FIGURE 5-11

COMPRESSION

TENSION

COMPRESSION

Q C

Q T

Q C

GROUND SURFACE

GROUND SURFACE

GROUND SURFACE

5 ft (1.5 m) OR 5B (WHICHEVER IS

DEPTH D

Q f

Q f

SIDE RESISTANCE

GREATER) MIN DEPTH

5B MIN DEPTH

PRESENT ONLY ON LEAD SECTION

B

Q f

Q BT

AREA OF PLATE REDUCED TO ACCOUNT FOR SHAFT

Q BC

B

DESIGN METHODOLOGY

B

Q C = Q BC + Q f

Q T = Q BT + Q f

Q C = Q BC + Q f

Q BC

5-12a BEHAVIOR OF SHALLOW ROUND SHAFT HELICAL PILES

5-12b BEHAVIOR OF SHALLOW ROUND SHAFT HELICAL ANCHORS

5-12c BEHAVIOR OF DEEP ROUND SHAFT HELICAL PILES WITH COUPLINGS

INDIVIDUAL BEARING AND SIDE RESISTANCE MODELS FOR HELICAL PILES AND ANCHORS WITH ROUND (PIPE) SHAFTS FIGURE 5-12

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