Method Statement for Compression Pile Load Test

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Method statement for Compression Pile Load Test.

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METHOD STATEMENT FOR COMPRESSION PILE LOAD TEST

PROJECT INFORMATION
Project:
Location:
The Owner:
The Contractor:

1. GENERAL
This paragraph shall be briefly information of the project, foundation specification

2. TEST PILE INFORMATION
Parameters
Pile type

Specifications
D500 Precast prestressed concrete
pile, pressed.

Pile tip
Pile top
Pile length
Design load
Maximum Test Load (200%
of design load)
Test type
Testing Standard

Axial Compression Test
ASTM D1143-81 (reapproved
1994)

3. TESTING APPARATUS
3.1 Load
Load shall be parallelepiped precast concrete. Total load shall be at least 120% test load.

3.2 Test Beam (Main Beam)
The steel girders will be laid across the test pile with system set up similar to that shown in
Figure 1.

Figure 1: Arrange main beam, cross beams and reference beams

3.3 Cross Beam
The steel girders will be laid across the test pile with system set up similar to that shown in
Figure 1.

3.4 Hydraulic Jacks
One hydraulic jack 600 ton capacity will be provided on top of the pile head as loading apparatus.
The hydraulic jack shall be verified and certificated by the authorized party.

3.5 Steel Bearing Plate
To provide non-eccentric load to the pile head, a steel bearing plate shall be inserted in between
the reaction beam and the hydraulic jack.

3.6 Dial gauges
Four dial gauges will be provided to monitor the pile movements by mounting between the pile
head and reference beams. The micrometer has a range of 0 – 50 mm and an accuracy of 0.01
mm. These gauges shall be verified and certificated by an authorized party.

3.7 Pressure gauge
A pressure gauge will be provided to monitor the applied load on pile head. The micrometer has a
range of 0 – 600 kg/cm2 and an accuracy of 5 kg/cm2. This gauge shall be verified and
certificated by an authorized party.

3.8 Reference Beam
Two reference beams will be cross-connected and laid on support firmly embedded in ground
with the end fixed and the other end freed.

3.9 Pressure Pump
A pressure pump with capacity of 3 liters per minutes and maximum pressure of 600 kg/m 3 shall
be provided and connected to hydraulic jack via hydraulic conduit to surcharge to or discharge oil
from the hydraulic jack.

4. MANPOWER
Experienced manpower shall be provided to execute the test and analyze results.

5. TEST PROCEDURE
The test shall conform to the standard ……… with sequence in percentage of design load. Two
cycles of test shall be performed.
Prior to performing test, 5% of the design load shall be applied on pile head and maintained
within 10 minutes before unload to the free condition. Dial gauges shall be adjusted to 0.

Cycle 1 (maximum to 100% of the design load)
 The load shall be added gradually by increasing from initial 0 to 25%, 50%, 75% and
100% of the design load.
 When each load increment will be achieved, the next load increment will be added only
when the settlement rate will be less than 0.25 mm per hour or after 2 hours, whichever
shall occur first.
 At each load increment, load, settlement and time will be recorded at 1, 2, 4, 8, 15, 30, 60,
90, 120, 240 minutes and every 2 hours with an accuracy of at least 0.01 mm.
 The maximum load will be kept constant for at least 24 hours and then reduced to 75%,
50%, 25% and 0% of the design load, respectively. Each load will be maintained until the
rate of settlement would not be greater than 0.25 mm per hour or after two hours,
whichever shall occur first.
 At “0” load, rebound movement will be recorded at 1, 2, 4, 8, 15, 30, 45, 60 minutes and
every hour thereafter until constant settlement will be reached.

Cycle 2 (maximum to 200% of the design load)
 The load will be added gradually by increasing form initial 0 to 25%, 50%, 75%, 100%,
125%, 150%, 175% and 200% of the design load.
 When each load increment will be achieved, the next load increment will be added every
after 5 minutes.
 At each load increment, load, settlement and time will be recorded at 1 and 5 minutes
with an accuracy of at least 0.01 mm.

 The load will then be reduced to 175%, 150%, 100%, 75%, 50%, 25% and 0% of the
design load, respectively.
 At “0” load, rebound movement will be recorded at 1, 2, 4, 8, 15, 30, 45, 60 minutes and
every hour thereafter until a no further settlement will be experienced.
 The tested pile will be considered failure when a rapid progressive movement of the pile
in the direction of loading under a constant load or physical failure of the test pile is
observed or a settlement of more than 15% of the diagonal dimension of the pile, which is
equivalent to 90 mm.

6. RESULTS OF TEST
The test results shall be reported in the form of:






Time, load, pile head movements, settlements and reference.
Load – settlement curve.
Time – settlement curve.
Time – load curve.
Report and recommendations on the ultimate pile capacity.

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