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http://dx.doi.org/10.7843/kgs.2019.35.8.17

Study(I) on Development of Charts and Formulae Predicting Allowable Axial Bearing Capacity for Prebored PHC Pile Socketed into Weathered Rock through Sandy Soil Layer - An Analysis of Sharing Ratio of Skin Friction to Total Bearing Capacity (SRF) by Analyzing Pile Load Test Data -  

Choi, Yongkyu (Dept. of Civil, Environmental and Urban Engrg., Kyungsung Univ.)
Lee, Wonje (Unicorn Technical Institute)
Lee, Chang Uk (Dept of Cvil Environmental Engrg, Kyungsung Univ.)
Kwon, Oh-Kyun (Dept. of Civil Engrg., Keimyung Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.35, no.8, 2019 , pp. 17-30 More about this Journal
Abstract
Based on pile load test results for various pile types that were constructed in-situ and pile design data of prebored PHC piles, the ratio of skin friction to total capacity (SRF) was analyzed. A SRF distribution range from the pile load test results for pilot test prebored PHC piles was 42~99% regardless of relative penetration lengths, soil types, and pile load test types. However, a SRF distribution range from the pile design data for prebored PHC piles was 20~53% regardless of relative penetration lengths and pile diameters. Also, a SRF distribution range from the restrike dynamic pile load test results for pretest working prebored PHC piles was a scattered range of 4~83% regardless of pile diameters, relative penetration lengths and soil types. The scattered SRF of pretest working piles was caused to the quality control issue on the filling of cement milk around piles and this quality control issue should be improved. The average SRF calculated by the current design method was estimated to be 2.2 times lower than the average SRF of the pilot test piles. It is because skin friction resistance is calculated at a very low level. Therefore, a new design method for skin friction will be proposed based on this study.
Keywords
Pile load test data analysis; Current design data anlaysis of prebored PHC pile; Sharing ratio of skin friction to total capacity (SRF); SRF of prebored PHC pile; Necessity of a new design method for skin friction;
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