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http://dx.doi.org/10.7843/kgs.2019.35.10.47

Study(V) on Development of Charts and Equations Predicting Allowable Compressive Bearing Capacity for Prebored PHC Piles Socketed into Weathered Rock through Sandy Soil Layers - Analysis of Results and Data by Parametric Numerical Analysis -  

Park, Mincheol (Seoul Institute of Technology)
Kwon, Oh-Kyun (Dept. of Civil Engrg., Keimyung Univ.)
Kim, Chae Min (Dept. of Civil, Environmental and Urban Engrg., Kyungsung Univ.)
Yun, Do Kyun (Dept. of Civil Engrg. in Graduate School, Kyungsung Univ.)
Choi, Yongkyu (Dept. of Civil, Environmental and Urban Engrg., Kyungsung Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.35, no.10, 2019 , pp. 47-66 More about this Journal
Abstract
A parametric numerical analysis according to diameter, length, and N values of soil was conducted for the PHC pile socketed into weathered rock through sandy soil layers. In the numerical analysis, the Mohr-Coulomb model was applied to PHC pile and soils, and the contacted phases among the pile-soil-cement paste were modeled as interfaces with a virtual thickness. The parametric numerical analyses for 10 kinds of pile diameters were executed to obtain the load-settlement relationship and the axial load distribution according to N-values. The load-settlement curves were obtained for each load such as total load, total skin friction, skin friction of the sandy soil layer, skin friction of the weathered rock layer and end bearing resistance of the weathered rock. As a result of analysis of various load levels from the load-settlement curves, the settlements corresponding to the inflection point of each curve were appeared as about 5~7% of each pile diameter and were estimated conservatively as 5% of each pile diameter. The load at the inflection point was defined as the mobilized bearing capacity ($Q_m$) and it was used in analyses of pile bearing capacity. And SRF was appeared above average 70%, irrespective of diameter, embedment length of pile and N value of sandy soil layer. Also, skin frictional resistance of sandy soil layers was evaluated above average 80% of total skin frictional resistance. These results can be used in calculating the bearing capacity of prebored PHC pile, and also be utilized in developing the bearing capacity prediction method and chart for the prebored PHC pile socketed into weathered rock through sandy soil layers.
Keywords
Prebored PHC pile; Parametric numerical analysis; Load-settlement curve; Axial load distribution; Settlement of 5% diameter; Mobilized load;
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Times Cited By KSCI : 3  (Citation Analysis)
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