Transmission And Substation Foundations - Technical Design Manual

TECHNICAL DESIGN MANUAL Symbols & Acronyms

Q act /Q calc Capacity Ratio Q calc

ksi

Kips (kilo-pounds) per square inch

Calculated Capacity

K t

Empirical Torque Factor

Q h Q s Q t q u

Individual Helix Capacity Capacity Upper Limit

L L

Pin spacing

Foundation Shaft Length

Total Ultimate Multi-Helix Anchor/Pile Capacity

L.I.

Liquidity Index Liquidity Index

Unconfined Compressive Strength Ultimate Capacity of the Soil

LI

Q ULT

LL LL

Live Load

R

Resistance or Resistivity

Liquid Limit (Section 2 only)

RF

Resisting Force

L p MAX

Maximum Free Span Between Piers

Resistivity Indication from Nillson Resistivity Meter

L u

Unsupported Length

R meter

M Mass n

RQD Rock Quality Desigination RR Round Rod RS Round Shaft S

Porosity

Field Blowcount Value from Standard Penetration Test (SPT)

N

Degree of Saturation (Section 2 only)

(N1) 6o Normalized SPT N-value NBS National Bureau of Standards N c

Average Friction Resistance on Pile Surface Area (Section 4 only) Southern Building Code Congress International

S

Bearing Capacity Factor for Cohesive Component of Soil

SBCCI

S K SL SL SL

Snow Load Factor

N q

Bearing Capacity Factor

Snow Load

Bearing Capacity Factor for Soil Weight and Foundation Width Effective Friction Angle Between Soil & Pile Material

N γ

Shrinkage Limit (Section 2 only) Service Life (Appendix A only)

ø

SPT Standard Penetration Test SS Square Shaft SS Split Spoon (Section 2 only) S t Soil Sensitivity ST Shelby Tube s u Undrained Shear Strength T

OCR Overconsolidation Ratio P Line Load on Footing P a Active Earth Pressure P cr Critical Buckling Load P crit Critical Compression Load P des Design Load per Pier pH Acidity or Alkalinity of a Solution PI Plasticity Index PIF Power Installed Foundation PISA Power Installed Screw Anchor PL Plastic Limit (Section 2 only) PL Proof Load (Section 6 only) P o Average Overburden Pressure P p Passive Earth Pressure ppm Parts per Million psf Pounds per Square Foot PT Test Pressure q Effective Vertical Stress on Element Q Axial Compressive Load q’ Effective Overburden Pressure Q act Actual Capacity

Average Installation Torque (Section 5 only)

T/C Tension/Compression T FN

Critical Helical Anchor Head Load

u Pore Water Pressure UC Unconfined Compression Test U cr Dimensionless Ratio USCS Unified Soil Classification System V Volume (Section 2 only) V Voltage (Appendix A only) VST Vane Shear Test W Soil Load w n Moisture Content Ws Weight of Steel Pile WSF Wenner Spacing Factor y Lateral Deflection of Shaft at Point x

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