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Analytical Study on the Appropriateness of Design Formula and Possibility of Improving Bearing Capacity of Bored Pile
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 Title & Authors
Analytical Study on the Appropriateness of Design Formula and Possibility of Improving Bearing Capacity of Bored Pile
Park, Jong-Bae; Lee, Bum-Sik; Park, Yong-Boo;
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 Abstract
To improve the pile design efficiency(design bearing capacity/the strength of materials) from 70 percent(160tonf) to 80 percent(190tonf), this paper analysed the existing pile loading test data and performed the precise dynamic loading test and Bi-directional loading test for the first time in Korea. Analysis result of the existing dynamic loading test data by Davisson method showed that bearing capacity of piles penetrated at weathered rock stratum(N=50/15) exceeded 190tonf. But the analysis result by CAPWAP method showed that piles less than the target bearing capacity were 40% due to the lack of impact energy. To get the target bearing capacity from the dynamic loading test, using the hammer over 6tonf to trigger the enough impact energy is necessary. Allowable bearing capacty of Bi-directional static loading test by Davisson method was 260.0~335tonf(ave. 285.3tonf) and exceeded overwhelmingly the target capacity. And this exceeded the bearing capacity of precise dynamic loading test(ave. 202.3tonf) performed on the same piles over 40%. The difference between the capacity of Bi-directional loading test and dynamic loading test was caused by the insufficient impact energy during dynamic loading test and increase by interlocking effect by near piles during Bi-directional static loading test.
 Keywords
Dynamic Loading Test;Davisson Method;CAPWAP;Bearing Capacity;Striking Energy;Bi-directional Loading Test;
 Language
Korean
 Cited by
 References
1.
박종배, 김정수, 임해식(2004), "개선된 기준으로 시공된 SIP 말뚝의 지지력 평가에 관한 연구", 한국지반환경공학회논문집, 5(3): 5-15.

2.
토지주택연구원(2014), 공사 PHC 말뚝 설계지지력 개선 방안 수립.

3.
한국지반공학회(2009), 국토해양부제정 구조물 기초설계 기준 해설