Transmission And Substation Foundations - Technical Design Manual

SECTION 3: PRODUCT FEASIBILITY Product Selection Guide

ROCK

POOR FAIR GOOD EXCELLENT

0 6 10 17 25 30 40 50 65 80 0.25 0.50 0.75 0.90

SANDS IGNEOUS ROCK 1 LOOSE MEDIUM DENSE VERY DENSE DOLERITE BASALT DIORITE GRANITE

ROCK QUALITY DESIGNATION (RQD) 2 length of core advance

QUARTZITE

DOLOMITE

LIMESTONE

GNEISS

COMPETENT ROCK

SANDSTONE

SCHIST

SHALE

Hubbell Power Systems, Inc. Chance® Helical Pile/Anchor Product Selection Guide

METAMORPHIC ROCK 1

SEDIMENTARY ROCK 1

NOTES: 1. Range of RQD of Slightly Weathered to Competent Rock. 2. Rock Quality Designation (RQD) = Σ length of intact pieces of core > 100 mm

S/C

VERY WEATHERED TO WEATHERED ROCK; CEMENTED SANDS; HARD CLAY SOILS

S/C

C

HARD

S

C

S

C

“N” (BLOWS PER FOOT)

SOIL

S C

S C

S

CHANCE® Helical Piles / Anchors

VERY STIFF

STIFF

STANDARD PENETRATION BLOW COUNT (per ASTM D1586)

MEDIUM

SS125

SSS5

SS150

SS175

SS200, SS225

RS2875., RS3500 RS4500

S = SAND

C = CLAY

SOFT TO

SOFT

VERY

VERY

LOOSE

CLAYS

PRODUCT SERIES

SOIL

Product Selection Guide, Figure 3-1

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