Utility Holding Capacities>>>

 

Soil Description
Blow
Count (N)
MR-4
Ultimate:
16 kips
MR-3
Ultimate:
20 kips
MR-2
Ultimate:
40 kips
MR-1
Ultimate:
40 kips
MR-SR
Ultimate:
40 kips
MK-B
Ultimate:
40 kips
Dense fine compacted sands
very hard silts or clays
45-60 9-16 (2,3,4) 17-20 (2,3,4) 21-28 (2,4) 36-40 (1,2,3) N/A N/A
Dense clays, sands and gravels
hard silts and clays
35-50 6-9 (4) 12-18 (4) 15-22 (2,4) 24-36 (2,4) 32-40 (2,3,4) N/A
Medium dense sandy gravel
stiff to hard silts and clays
24-40 4.5-6 (4) 9-14 (4) 12-18 (4) 18-24 (4) 24-34 (2,4) N/A
Medium dense coarse sand and sandy gravel
stiff to very stiff silts and clays
14-25 3.5-4.5 (4) 7-9 (4) 9-12 (4) 15-20 (4) 18-24 (4) N/A
Loose to medium dense fine to coarse sand
firm to stiff clays and silts
7-14 2.5-4 (4) 5-8 (4) 7-10 (4) 10-15 (4) 14-18 (4) 20-24 (4)
Loose find sand, alluvium, soft clays
fine saturated silty sand
4-8 1.5-2.5 (4) 3-5 (4,6) 5-8 (4,6) 8-12 (4,6) 9-14 (4-6) 13-20 (4,6)
  1. Drilled pilot hole required for efficient installation
  2. Ease of installation may be improved by drilling a pilot hole
  3. Holding capacity limited by ultimate strength of anchors
  4. Holding capacity limited by soil structure
  5. Not recommended in these soils
  6. Wide variation in soil properties reduces prediction accuracy. Pre construction field test is recommended

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