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 ProblemRead More

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