[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.14481/jkges.2011.12.10.8

A Numerical Analysis Study for Estimation of Ultimate Bearing Capacity and An Analysis of the High Capacity Bi-directional Pile Load Tests of the Large-diameter Drilled Shafts

Nam, Moonsuk (한국도로공사 도로교통연구원)
Kim, Sangil (한국양방향말뚝재하시험협회)
Hong, Seokwoo (동의대학교 공과대학 토목고악과)
Hwang, Seongchun (경주대학교 철도건설환경공학과)
Choi, Yongkyu (경성대학교 공과대학 토목공학과)

Publication Information

Journal of the Korean GEO-environmental Society / v.12, no.10, 2011 , pp. 63-72 More about this Journal

Abstract

The high capacity bi-directional pile load test is an optimum pile load test method for high-rised buildings. Especially, a high pressure and double-acting bi-directional pile load testing, a special type of the high capacity bi-directional pile load test, is the most practical way to overcome limitations of loading capacities and constraints of field conditions, which was judged to be a very useful test method for requiring high loading capacities. Total of 2 high capacity bi-directional pile load tests(P-1 and P-2) were conducted in high-rised building sites in Korea. Based on the field load test results, the sufficiency ratio of loading capacities to design loads for P-1 and P-2 were 3.3 and 2.1, respectively. For P-2, the load test could not verify the design load if 1-directional loads applied slightly smaller than the actual applied load. Also, high capacity bi-directional pile load tests were difficult to determine an ultimate state of ground or piles, although the loads were applied until their maximum loads. Hence, finite element analyses were conducted to determine their ultimate states by calibrating and extrapolate with test results.

Keywords

Extremely high loading capacity; Bi-directional high pressure pile load test(BDH PLT); High rise building; Ultimate bearing capacity; Numerical analysis;

Citations & Related Records

Reference

1	(주)동아지질(2008), 해운대 두산 위브 더 제니스 신축공사 양방향재하시험 보고서, pp. 4-6.
2	(주)새길이엔씨(2007), 부산 해운대 우동 프로젝트 지반분석 및 기초검토(현장타설말뚝) 부록 3, pp. 34-39.
3	(주)지텍크(2008), 해운대 우동 PROJECT 현장타설말뚝( $\Phi$ 2,000, $\Phi$ 2,500) 및 소구경 현장타설말뚝( $\Phi$ 500)의 재하시험보고서, pp. 7-9.
4	최용규(1989), 개단강관말뚝의 폐색효과에 관한 실험적인 연구, 박사학위논문, 서울대학교, pp. 13-20.
5	최용규(2009), 양방향말뚝재하시험의 재하용량 기준에 관한 연구, 대한토목학회논문집, Vol. 28, No, 6C, pp. 1-10.
6	ASTM D1143-81(Reapproved by 1994)(1994), Standard Testmethod for Piles Under Static Axial Compressive Load, American Society of Testing and Materials, West Conshohocken, Pennsylvania, USA, pp. 104-114.
7	Davisson, M. T.(1972), High Capacity Piles, Proceedings of Lecture Series on Innovations in Foundation Construction, ASCE, Illinois Section, Chicago, IL, March 22, pp. 81-112.
8	Hassan, K. M.(1994), Analysis and Design of Drilled Shafts Socketed into Soft Rock, Ph. D. Thesis, Department of Civil & Environmental Engineering, University of Houston, Houston, Texas, pp. 27-29.
9	Loadtest Inc.(2010), Project Highlights; 15,000+ Ton Tests Performed by Loadtest, http://www.loadtest.co.uk.
10	Osterberg, J. O.(1986), Device for Testing The Load Bearing Capacity of Concrete-filled Earthen Shafts, United States Patent 4614110, pp. 1.28.1-1.28.11.
11	Peng, Koon, Page & Lee(1999), Osterberg Cell Testing of Piles, Proceedings of the International Conference on Rail Transit, Singapore, March, pp. 94-97.
12	PLAXIS.(1998), PLAXIS Version 8 Tutorial Manual, pp. 1-1-2-8.