場鑄樁受側向載重之行為評估

吳許行

doi:10.6840/cycu201500110

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場鑄樁受側向載重之行為評估

Evaluation of Lateral Behavior for Drilled Shaft Foundations

吳許行 , Masters　　Advisor：陳逸駿　　

繁體中文 DOI： 10.6840/cycu201500110

p-y curve ；側向載重試驗；場鑄樁；張氏簡易分析法； p-y curve ； Y-L Chang method ； drilled shaft ； lateral loading test

Abstract │ Reference (22) │ Altmetrics

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ABSTRACT

The lateral behavior of drilled shaft foundations under lateral loading is evaluated in this study. The measured results of drilled shaft lateral loading are compared with analysis results by Y-L Chang method and p-y curve method. The data employed are subdivided into drained soils, undrained soils, and gravelly soils. The tendency of lateral behavior for the drilled shaft using statistical analysis is presented. Meanwhile, the analysis results of drilled shafts in this study are also compared with previous analysis results for driven piles.

Based on the comparison of measured and analysis results for drained soils, the predicted capacity is close to the measured capacity either using Y-L Chang method or p-y curve method while the displacement of pile head is smaller than 25 mm. While the pile head is longer than 25 mm, the predicted capacity by Y-L Chang's method is overestimated. For undrained soils, the predicted capacity by p-y curve method presents inconsistent. The predicted capacity is close to the measured capacity by using Y-L Chang method while the displacement of pile head is 30 mm. While the displacement of pile head is larger than 30 mm, the predicted capacity is overestimated.
 
	For gravelly soils, the SPT-N value with 50 and 100 is used to calculate the capacity by Y-L Chang method. It was found that the capacity is underestimated with SPT-N of 50 if the displacement for pile head smaller than 30 mm. When using the SPT-N value with 100, the predicted capacity is close to the measured capacity for the displacement of pile head is 20 mm. However, the predicted capacity is overestimated if the displacement of pile head is larger than 30 mm. In p-y curve method, the predicted capacity is close to the measured capacity while the displacement of pile head is 10 mm for either the effective stress friction angle is 41° or 45°. The predicted capacity by p-y curve method is overestimated if the displacement of pile head is longer than 10 mm.

To evaluate the impact of construction method on the lateral capacity, the analysis results of drilled shafts and driven piles are compared. The differences are also concluded between drilled shafts and various types of driven pile.

Reference ( 22 ) 〈TOP〉

2.Honjo, Y, Zaika, Y and Pokharel, G (2005). “Estimation of Subgrade Reaction Coefficient for Horizontally Loaded Piles by Statistical Analyses”, Soils and Foundations, 45(3), 51-70.
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6.Matlock, H and Reese, LC (1960). “Generalized Solution for Laterally Loaded Piles,” Proc. Journal of Soil Mechanics and Foundations Division, ASCE, Vol. 86, No. SM 5, Part 1.
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10.Mitchell, JK (1976). “Interpretation of In-situ Soil Tests”, Geotechnique, 34(4), 449-489.
連結：
12.Reese, LC and Wang, ST (1989). “LPILE PLUS Computer Program Documentation”, Ensoft,Inc., Austin, Texas.
連結：
14.Reese, LC, Cox, WR, and Koop, FD (1974). “Analysis of Laterally Loaded Piles in Sand,” Proc., 6th Offshore Technology Conference, Houston, TX
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