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Synthesis of Load-Deflection Characteristics of Laterally Loaded Large Diameter Drilled Shafts: Technical Report.
| 题名： | Synthesis of Load-Deflection Characteristics of Laterally Loaded Large Diameter Drilled Shafts: Technical Report. |
| 作者： | Briaud, J.; Wang, Y. |
| 关键词： | Horizontal load, Sand, Clay, Displacements, Drilled shafts, Lateral load, Large diameter, Pile load tests, Database, P-y curves, Predicted, Measured, Load, Displacement, Synthesis, Texas Department of Transportation (TxDOT) |
| 摘要： | This project evaluated how well current P-y curves predict the behavior of large diameter piles subjected to monotonic lateral loading. Current P-y curves were developed about 60 years ago based on lateral load tests on piles, which were about 2 ft in diameter, while today’s pile diameters can reach 12 ft. This significant difference in scale brings into question the application of these early P-y curves to today’s large diameter piles (?5 ft). A database of 35 piles with diameters larger than 5 ft (up to 9.8 ft) and 54 piles with diameters less than 5 ft both in sand and in clay was assembled. Predictions of load and displacement are carried out using P-y curves and LPILE. These predictions are compared to the measured loads and displacements. In sand, the ratio of predicted load over measured load L(sub pred)/L(sub meas) averages 0.9 for all piles and increases with diameter from 0.7 for smaller diameter piles to 1.1 for larger diameter piles. Overall, L(sub pred)/L(sub meas) is between 0.4 and 1.4 most of the time. In clay, L(sub pred)/L(sub meas) averages 0.9 for all piles and decreases with diameter from 1.3 for smaller diameter piles to 0.7 for larger diameter piles. Overall, L(sub pred)/L(sub meas) is between 0.4 and 1.6 most of the time. In sand, the ratio of predicted deflection over measured deflection y(sub pred)/y(sub meas) averages 1.9 for all piles and decreases with diameter from 2.25 for smaller diameter piles to about 1 for larger diameter piles. Overall, the ratio y(sub pred)/y(sub meas) is between 0.5 and 5 most of the time. In clay, y(sub pred)/y(sub meas) averages about 1.4 for all piles and increases with diameter from 0.9 for smaller diameter piles to 3 for larger diameter piles. Overall, y(sub pred)/y(sub meas) is between 0.2 and 5 most of the time with some values reaching 8 for larger diameter piles. |
| 报告类型： | 科技报告 |
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