기초분리말뚝 공법의 설계기법 개발
Development of Design Method of Disconnected Piled Raft Foundation System

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최정인; 민기훈; 김성호; 권오성; 김명모
Issue Date
한국지반공학회 = Korean Geotechnical Society
한국지반공학회 가을학술발표회 논문집, pp. 691-699
Disconnected PilePiled-Raft FoundationArea replacement ratioLoad bearing ratio of piles
In the design of a foundation, settlement of the foundation may exceed allowable design
criteria even with a competent bearing stratum. In such a case, a piled-raft foundation system may be adopted
using piles as settlement reducing component. In this paper, Disconnected Piled Raft Foundation (DPRF)
system, which installs disconnected piles underneath the raft and uses the piles as ground reinforcements, is
studied as a cost effective design method against the classical piled-raft foundation system. To this end, large
size loading tests were carried out on weathered ground changing area replacement ratio and length of piles.
The results indicated that the settlement of the reinforced ground was reduced by 34∼87% and the allowable
bearing pressure increased by 70% on average from those of the unreinforced original ground, respectively.
The correlating formula between the area replacement ratio and the load bearing ratio of piles were derived
from the test results and numerical analysis. From the correlation, a design method determining the size and
the quantity of the disconnected piles to enhance the bearing capacity of original ground to the desired value
was proposed based on one inch settlement criteria.
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Civil & Environmental Engineering (건설환경공학부)Others_건설환경공학부
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