Transmission And Substation Foundations - Technical Design Manual (TD06088E)

ROCK

0.25 0.90 0.75 0.50 POOR FAIR GOOD EXCELLENT

DOLERITE

BASALT

DIORITE

ROCK QUALITY DESIGNATION (RQD) 2

QUARTZITE

GRANITE

DOLOMITE

SOIL VERYWEATHERED TOWEATHERED ROCK; CEMENTED SANDS; HARD CLAY SOILS COMPETENT ROCK IGNEOUS ROCK 1 SCHIST GNEISS DENSE VERY DENSE

LIMESTONE

Σ length of intact pieces of core > 100 mm length of core advance

SANDSTONE

HUBBELL POWER SYSTEMS, INC. CHANCE ® HELICAL PILE / ANCHOR

METAMORPHIC ROCK 1

SEDIMENTARY ROCK 1 SHALE

PRODUCT SELECTION GUIDE

PRODUCT FEASABILITY

ATLAS RESISTANCE ® Piers

NOTES: 1. Range of RQD of SlightlyWeathered to Competent Rock. 2. Rock Quality Designation (RQD) =

0 6 10 17 25 30 40 50 65 80

S/C

S/C

S C

HARD

S C

S C

CHANCE ® Helical Piles / Anchors

“N” (BLOWS PER FOOT)

S C

VERY STIFF

S C

S C

STANDARD PENETRATION BLOW COUNT (per ASTM D1586)

MEDIUM

STIFF

C = CLAY

S = SAND

LOOSE

MEDIUM

SS125

SSS5

SS150

SS175

SS200, SS225

RS2875., RS3500 RS4500

SOFT TO

VERY

SOFT

VERY

LOOSE

CLAYS

SANDS

PRODUCT SERIES

SOIL

Product Selection Guide, Figure 3-1

Page 3-7 | Hubbell Power Systems, Inc. | All Rights Reserved | Copyright © 2017