3.2
FIELD TESTS AND INSPECTIONS
3.2.1
Test Piles
Test piles shall be driven in the manner specified elsewhere in this
section. The Government will use test pile and load test data, as well as
test reports on soil samples, to determine "calculated" pile tip elevations
and the necessary driving resistance. Test piles that are located within
the tolerances indicated and that provide a safe design capacity, as
determined by the results of a satisfactory load test, may be used in the
finished work. The Contractor shall drive [_____] test piles [at the
locations indicated] [in the vicinity of the soil boring test holes Nos.
[_____]]. [If jetting is permitted, it will be permitted by the
Contracting Officer only when test piles validate its use.] Test piles
shall be driven to the tip elevation specified or indicated for bidding
lengths. [_____] test piles shall be withdrawn as indicated after reaching
the "calculated" tip elevation in order to provide for visual inspection of
the pile.
3.2.2
Load Tests
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NOTE: When it is desirable to show analysis for
determination of pile capacities from load tests and
for relating load test capacities to job capacities,
the following shall be included in this paragraph:
Pile Capacity: The capacity, as driven, of single
piles not in clusters in the structure shall be not
less than [_____] kN tons. The capacity shall be
determined by the following formulas, modified
according to the data obtained by the load tests:
For single-acting hammers: R= (166.67WH)/ (S +
2.54P/W) R= (2WH)/ (S + 0.1 P/W).
And double-acting hammers: R= (166.67E)/ (S + 2.54
P/W) R= (2E)/ (S + 0.1 P/W).
Where:
R is the allowable static pile load in kN pounds.
W is the weight of the striking part of the hammer
in kN pounds.
H is the effective height of fall in meters feet.
E is the actual energy delivered by the hammer per
blow in kN-m foot-pounds.
S is the average net penetration in mm inches per
blow for the last five blows after the pile has been
driven to a depth where successive blows produce
approximately equal net penetration (a minimum
distance of 910 mm 3 feet for friction piles).
P is the weight of the pile in kN pounds. (If P is
less than W, P/W shall be taken as unity.)
SECTION 02456A
Page 12
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