Plate Load Test Method and Procedure.
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Plate Load Test Method and Procedure.

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Plate Load Test  Method and Procedure. 

This article covers the test procedure adopted for the Plate Load tests based on the requirements of BS 1377 Part 9.

Equipment / Accessories.

  • 455 mm diameter steel plate  
  • 50T capacity hydraulic jack with digital pressure gauge.  
  • Dial Gauge for settlement recording (25 mm x 0.01mm) 
  • Reference bar  
  • Reaction Load   
Note-1: Reaction Load (Shovel Vehicle or heavy load vehicles)


 Test Personnel.

A well-trained technician experienced in the relevant field assisted by helpers.   

- Test Location.

The location or the area for testing shall be identified by the Client 
Representative and agreed between all interested parties in the project.  

 Level of the test surface shall be same as the foundation level.  

 

- Test Procedure.

Arrange the reaction load at the test location in such a manner that when the base  plate is placed. Here a Wheel loader (approx.30T) can be used and the whole load  of the vehicle can use for the test including the load of wheel.  

Level the area under the reaction load, where the test has to be performed, using the bearing plate.   

Check the level using a spirit level.   

All the equipment’s / accessories relevant to the test such as load cell, dial gauges,  hydraulic jack assembly, reference bar, etc. are assembled and placed firmly on  the test location. And should keep the copy of calibration certificates.  

Seating force shall be applied to provide proper base for testing.


  

Subsequently load increment shall be applied which is generally 1/5 of the total load.   

At each increment dial gauge deflections are observed and recorded for a period of  15 minutes at fixed intervals (30seconds, 1min, 2mins, 4mins, 8mins and 15mins). 


 

At the end of the test pressure shall be released in three equal decrements and  rebound deflection is observed at each interval for 15mins



- Test report.
The test report apart from all the mandatory information’s required as per ISO/IEC 17025:  2005 shall include:   

  •  Continuous listing of load and settlement data   
  •  Load vs. Settlement graph.  
  •  Settlement at maximum applied stress  
  •  Settlement (25mm maximum) at required load (200 kPa) estimated bearing capacity of soil.   






   

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