To ensure that failure does not occur before the design load (Working Pile) .
To determine the ultimate bearing capacity of the soil for the design of other pile (Pilot Pile) .
TO indicate structural soundness of the pile.
To determine Load-Settlement behaviour of pile to predict group settlement or defferential settlement of other pile.
LOAD TRANSFER FROM PILE TO SOIL
COMMON TYPE OF LOAD TEST
COMPRESSION TEST
Building
Bridge
Other heavy structure
TENSION TEST
Light structure i.e., Frame structure
Transmittion line station under wind load
HORIZONTAL LOAD TEST
For structure with wind load
Structure with earth quake
For structure with dynamic load
COMPRESSION TEST PROCEDERE
MAINTAINED LOADING TEST
PROCEDURE : Increase the load in stage until the proposed working load is reached and then unload.
Increament of load at each stages will be permitted when rate of settlement is less than 0.25 mm./hr.
APPLICATION : Forworking pile test to determine pile load behaviour in the region of working load with factor of safety.
Test need not require to damage the pile.
CONSTANT RATE OF PENETRATION TEST (CRP TEST)
PROCEDURE : Load will be increase by maintaining rate of settlement(Constant Speed) about the same as undrained test in labotory.(0.25-1.25 mm/min.) for cohesionless soil)
APPLICATION: TOdetermintultimate load of the pile can be damage pilot pile is recommended.
COMPRESSION TEST SYSEM
USING KENTLEDGE SYSTEM (DEAD LOAD)
Load less than 500 tons
No anchorage available or possible for arrangement
Use concrete box, steel or sand as dead load
USING ANCHORAGE SYSTEM
Up to 4,000 tons test applicable
Use anchore pile or rock anchore
>>SIDE VIEW SET UP
>>FRONT VIEW SETUP
TEST RESULT PRESENTATION
Load V.S. SETTLEMENT PLOT
TIME V.S. SETTLEMANT PLOT
TIME V.S. LOAD PLOT
LOAD- STATLEMNT - TIME RELATIONSHIPS OF 1.2 m. DIA. x49 m BORED PILE
Faculty of Engineering Chulalongkorn University
INTERPRETATION OF TEST RESULT
ULIMATE LOAD OF PILE
Load at which settlement reach 10 % of pile daimeter(Bearing Pile)
Load at which pile can not take any more load (Friction)
In general, structural building are not permitted for settlement greater than 25 mm. for simple beam design
WORKING LOAD OF PILE
Devided ultimate load of pile by factory of safety of 2.5 for bearing or by 2.0 for fraction pile
Intersection point between 2 parts of curve from load V.S. settlement devided by 1.5
In practical settlement at working load is ot allowed more than 6 mm. for bored pile or 4 mm. for driven pile
ESTIMATED UKTIMATE CAPACITY OF 0.6 m. DIA. x25 BORED PILE
SWEET SUIT HOTEL(Test#2)
