Lecture 21 :
Types of pile load test [ Section 21.1 : Different types of pile load test ]
Terminologies
Test pile -pile chosen for pile load test only. It may or may not be a working pile. It can work as a working pile if routine load test is carried out on it is up to half of the safe load.
Initial test -it is done on test piles to determine the safe load or allowable load or ultimate load bearing capacity.
Trial pile -minimum two initial test should be conducted and half percentage of the total number of piles used in a project must be subjected to routine test. For largely varying strata and for important structure, it is up to 2%.
Different types of pile load test
1.
Maintained Load Test
Load is maintained in 10 or 8 steps and maintained for sometime to exact settlement.(step load test).To test a single pile at least 3 dial gauges should be used and 4 dial gauges for group piles.loading rate is 0.1mm/hr. For clay it is 0.02mm/hr.loadf is maintained for atleast 2hrs. safe load is maintained for 24 hrs.
2.
Constant Rate Of Penetration Test
Generally used for soft clays and penetration is done for constant rate of 0.75mm/min.
