What is dynamic test for piles?
Dynamic load testing (or dynamic loading) is a method to assess a pile’s bearing capacity by applying a dynamic load to the pile head (a falling mass) while recording acceleration and strain on the pile head.
Is code for high strain dynamic pile testing?
High strain dynamic testing is a method of testing deep foundations to obtain information about their capacity and integrity, and in some cases, to monitor their installation. It is codified by ASTM D4945-12 – Standard Test Method for High-Strain Dynamic Testing of Piles.
What is the difference between static and dynamic pile load test?
Dynamic vs Static load tests Compared to a static load test, dynamic load tests are significantly cheaper and quicker to carry out. For example, when driving a steel pile, no additional equipment like beams, anchor piles or heavy ballast weights are required.
What are the limitations of pile load test?
1. Pile Integrity Test does not provide any information on the load bearing capacity of piles and deep foundations. 2. Integrity Testing cannot be conducted over pile caps.
How many types of pile tests are there?
These include three distinct methods: Nuclear radiation, or gamma-gamma method. Short wave (ultrasonic) acoustic method. Long wave (sonic) acoustic method.
What is Sonic test for piles?
Cross-hole sonic logging test is conducted to determine quality of concrete for deep pile and identifies the defect location based on ultrasonic pulse velocity. Generally unit skin friction can be determined CSL and strain captured during O-Cell pile load test.
Is 2911 Part 4 load test piles?
According to IS: 2911 a 1974 (Parta4), the allowable load may be taken as one of the following whichever is less. 50 % of the load at which the total settlement is 10 % of the diameter of the pile. Two—thirds of the final load at which total settlement is 12 mm.
How is pile load capacity calculated?
Pile load testing
- Total test load ( Q ) = 2 × Design load ( D )
- Total test load ( Q ) = 2 × ( Design load + Negative skin friction ) If negative skin friction is known with good accuracy, one can use the following equation:
- Total test load ( Q ) = 2 × ( Design load ) + Negative skin friction.
What percentage of piles should be tested?
Lower safety factors for dynamic testing require at least 15% of the piles to be dynamically tested (and also comprehensive site investigations and careful construction control), while higher factors are used when less than 3% of the piles are dynamically tested.
What is high strain dynamic load test?
The high-strain dynamic load tests, referred to as PDA tests, assess the capacity, integrity, and driving stresses during the installation of driven piles. Further monitoring of hammer energy and efficiency can be made during driving.
What is CSL test?
The CSL method is an ultrasonic test that involves measuring the propagation time of ultrasonic signals between two probes in vertical tube /ducts in a shaft. These tubes were casted into a shaft during construction of cast in-situ pile.
What is koden test?
1.4 Koden Test The method of Koden test is to drop down an instrument along pile hole to the bottom. The instrument will transmit ultrasonic wave to the pile wall and receive refl ected wave during the drop down process. Diameter of testing pile hole should be from 0.5m to 4.0m and the depth should be 100m.
What types of analyses are available for dynamic load testing piles?
Two types of analyses that are complementary to dynamic load testing of piles are also possible – the wave equation analysis with the help of the GLRWEAP software (Wave Equation Analysis Program) and the CAPWAP analysis (Case Pile Wave Analysis Program).
How do you calculate the dynamic component of a pile?
The dynamic component is computed as the product of the pile velocity times a soil parameter called the Damping Factor. The damping factor is related to soil grain size.
What is non-destructive pile testing?
This non-destructive testing method is usually applied to concrete piles, concrete filled pipe piles, drilled shafts, auger cast-in-place (continuous flight auger) piles, and sometimes timber piles.
What are the different types of drive pile testing?
Dynamic testing on all driven pile types STRAIN ACCELERATION GRL 40 ton APPLE Testing an 84” drilled shaft, 30” drop hydraulic release Activated 4000+ tons Measure Strain and Acceleration Convert strain to force Integrate acc to velocity 4
