Types of pile load test Notes | EduRev

: Types of pile load test Notes | EduRev

 Page 1


Module 5 : Design of Deep Foundations
Lecture 21 : Types of pile load test [ Section 21.1 : Different types of pile load test ]
   Objectives
   In this section you will learn the following
Terminologies
Maintained Load Test
Constant Rate Of Penetration Test
 
 
Page 2


Module 5 : Design of Deep Foundations
Lecture 21 : Types of pile load test [ Section 21.1 : Different types of pile load test ]
   Objectives
   In this section you will learn the following
Terminologies
Maintained Load Test
Constant Rate Of Penetration Test
 
 
Module 5 : Design of Deep Foundations
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.
 Cyclic load test
 
 Fig. 5.8 Load vs settlement
 
Page 3


Module 5 : Design of Deep Foundations
Lecture 21 : Types of pile load test [ Section 21.1 : Different types of pile load test ]
   Objectives
   In this section you will learn the following
Terminologies
Maintained Load Test
Constant Rate Of Penetration Test
 
 
Module 5 : Design of Deep Foundations
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.
 Cyclic load test
 
 Fig. 5.8 Load vs settlement
 
Module 5 : Design of Deep Foundations
Lecture 21 : Types of pile load test [ Section 21.1 : Different types of pile load test ]
 
 
 
Elastic compression of the soil, 
Where, length of the pile
P=pile load 
L=length of pile 
A=area of cross section of the pile 
E=modulus of elasticity of the pile 
Compute the pile tip capacity and shaft end
capacity.
 Fig. 5.9. Elastic settlement vs load 
 
 Fig-5.10 Q Calculate the Value of Tip Resistance and Shaft Resistance in Cyclic Pile Load Test.
 
Page 4


Module 5 : Design of Deep Foundations
Lecture 21 : Types of pile load test [ Section 21.1 : Different types of pile load test ]
   Objectives
   In this section you will learn the following
Terminologies
Maintained Load Test
Constant Rate Of Penetration Test
 
 
Module 5 : Design of Deep Foundations
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.
 Cyclic load test
 
 Fig. 5.8 Load vs settlement
 
Module 5 : Design of Deep Foundations
Lecture 21 : Types of pile load test [ Section 21.1 : Different types of pile load test ]
 
 
 
Elastic compression of the soil, 
Where, length of the pile
P=pile load 
L=length of pile 
A=area of cross section of the pile 
E=modulus of elasticity of the pile 
Compute the pile tip capacity and shaft end
capacity.
 Fig. 5.9. Elastic settlement vs load 
 
 Fig-5.10 Q Calculate the Value of Tip Resistance and Shaft Resistance in Cyclic Pile Load Test.
 
Module 5 : Design of Deep Foundations
Lecture 21 : Types of pile load test [ Section 21.1 : Different types of pile load test ]
  Recap
   In this section you have learnt the following.
Terminologies
Maintained Load Test
Constant Rate Of Penetration Test
Page 5


Module 5 : Design of Deep Foundations
Lecture 21 : Types of pile load test [ Section 21.1 : Different types of pile load test ]
   Objectives
   In this section you will learn the following
Terminologies
Maintained Load Test
Constant Rate Of Penetration Test
 
 
Module 5 : Design of Deep Foundations
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.
 Cyclic load test
 
 Fig. 5.8 Load vs settlement
 
Module 5 : Design of Deep Foundations
Lecture 21 : Types of pile load test [ Section 21.1 : Different types of pile load test ]
 
 
 
Elastic compression of the soil, 
Where, length of the pile
P=pile load 
L=length of pile 
A=area of cross section of the pile 
E=modulus of elasticity of the pile 
Compute the pile tip capacity and shaft end
capacity.
 Fig. 5.9. Elastic settlement vs load 
 
 Fig-5.10 Q Calculate the Value of Tip Resistance and Shaft Resistance in Cyclic Pile Load Test.
 
Module 5 : Design of Deep Foundations
Lecture 21 : Types of pile load test [ Section 21.1 : Different types of pile load test ]
  Recap
   In this section you have learnt the following.
Terminologies
Maintained Load Test
Constant Rate Of Penetration Test
Module 5 : Design of Deep Foundations
Lecture 21 : Types of pile load test [ Section 21.2 : Problem ]
   Objectives
   In this section you will learn the following
Problem
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