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APPENDIX 2F
MODEL SPECIFICATIONS
Chapter 2
Helical Foundation Systems
13.4.7 Verification test nails shall be incrementally loaded to a maximum test load of 200% of
the DTL in accordance with the following loading schedule. The helical soil nail head
movements shall be recorded at each load increment.
VERIFICATION TEST LOADING SCHEDULE
Load
Hold Time
AL (0.05 DTL max.)
1 minute
0.25DL
10 minutes
0.50DL
10 minutes
0.75DL
10 minutes
1.00DL
10 minutes
1.25DL
10 minutes
1.50DL (Creep Test)
60 minutes
1.75DL
10 minutes
2.00DL
10 minutes
The alignment load (AL) should be the minimum load required to align the testing
apparatus and should not exceed 5% of the DTL. Dial gages should be set to “zero”
after the alignment load has been applied. Each load increment shall be held for at
least 10 minutes. The verification test helical soil nail shall be monitored for creep at
1.50 DTL. Nail movements during the creep portion of the test shall be measured and
recorded at 1 minute, 2, 3, 5, 6, 10, 20, 30, 50, and 60 minutes.
13.5 Proof testing of production helical soil nails shall be performed on three percent (1 in 33) or more
of the production helical soil nails in each horizontal row or a minimum of 1 nail per row. The
quantity and size of helix plates along the soil nail shaft shall be determined such that the torque
strength rating and allowable helical nail structural capacity is not exceeded during installation
and testing. The minimum length of the proof tested production helical soil nail is 7 feet. The
following requirements for proof testing shall be followed:
13.5.1 The DTL shall be determined as shown in Section 14.4.6
13.5.2 Proof tests shall be performed by incrementally loading the helical soil nail to a maximum
test load of 150% of the DTL in accordance with the following loading schedule. At
load increments other than the maximum test load, the load shall be held long enough
to obtain a stable reading. A stable reading is defined as less than 0.010 inches of
movement between readings taken two minutes apart. The helical soil nail head
movements shall be recorded at each load increment.
PROOF TEST LOADING SCHEDULE
Load
Hold Time
AL (0.05 DTL max.)
Until Stable
0.25DL
Until Stable
0.50DL
Until Stable
0.75DL
Until Stable
1.00DL
Until Stable
1.25DL
Until Stable
1.50DL (Max. Test Load)
See Below