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Evaluation of Direct Pile-CPT Methods for Estimating the Ultimate Capacity of Driven Piles
The cone and piezocone penetration tests (CPT and CPTu) have been widely acknowledged as very useful in situ tests for subsurface investigation and soil characterization. The CPT is fast, robust, and economical test that can provide continuous soundings with depth. Due to similarity between pile and cone, the estimation of pile capacity from CPT data was among the earliest applications of the CPT. Accordingly, different direct pile-CPT methods have been developed based on this analogy between the cone and the pile. Analyses and evaluation were conducted on eighty driven friction piles of different sizes and lengths that were failed during pile load testing. The pile-CPT methods were used to estimate the load carrying capacities of the investigated piles (Qp). The Davisson method was used to determine the measured load carrying capacities from pile load tests (Qm). Four criteria were selected for evaluating the different pile-CPT methods: the best fit line for Qp versus Qm, the arithmetic mean and standard deviation for the ratio Qp/Qm, the cumulative probability for Qp/Qm, and the histogram and log normal distribution for Qp/Qm. Results of the analyses have been used to evaluate the ability of different pile-CPT methods for estimating the pile capacity.
Evaluation of Direct Pile-CPT Methods for Estimating the Ultimate Capacity of Driven Piles
The cone and piezocone penetration tests (CPT and CPTu) have been widely acknowledged as very useful in situ tests for subsurface investigation and soil characterization. The CPT is fast, robust, and economical test that can provide continuous soundings with depth. Due to similarity between pile and cone, the estimation of pile capacity from CPT data was among the earliest applications of the CPT. Accordingly, different direct pile-CPT methods have been developed based on this analogy between the cone and the pile. Analyses and evaluation were conducted on eighty driven friction piles of different sizes and lengths that were failed during pile load testing. The pile-CPT methods were used to estimate the load carrying capacities of the investigated piles (Qp). The Davisson method was used to determine the measured load carrying capacities from pile load tests (Qm). Four criteria were selected for evaluating the different pile-CPT methods: the best fit line for Qp versus Qm, the arithmetic mean and standard deviation for the ratio Qp/Qm, the cumulative probability for Qp/Qm, and the histogram and log normal distribution for Qp/Qm. Results of the analyses have been used to evaluate the ability of different pile-CPT methods for estimating the pile capacity.
Evaluation of Direct Pile-CPT Methods for Estimating the Ultimate Capacity of Driven Piles
Amirmojahedi, Mohsen (author) / Abu-Farsakh, Murad (author)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 167-177
2019-03-21
Conference paper
Electronic Resource
English
Evaluation of Direct Pile-CPT Methods for Estimating the Ultimate Capacity of Driven Piles
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