Geotechnical Engineering (한국지반공학회지:지반)

Korean Geotechnical Society (한국지반공학회)
권호 표지

Soil Plugging Behavior of Open -ended Pile for Different Installation Methods

말뚝의 설치 방법에 따른 관내토의 폐색 거동

  • 최용규 (정회원, 경성대학교 공과대학 토목공학과)
  • Published : 1995.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

A specially designed model open -ended pile, which was composed of inner tube and outer tube, wry driven in the pressure chamber by two diffenent intallation methods, that is, impact -driving and vibratory driving, and static compression loading test was done for that pile. Through the measurement of bearing capacities in the separated resisting parts of open -ended pile, bearing mechanism of open-ended pile and soil plugging behaviors for different installation methods were studied. It appears that 20% out of soil plugging force of impact -driven pile was developed during driving, while the rest was developed during static compression loading and t.he magnitude of confining pressure applied to the chamber did not affect soil plugging behavior. Also. it appears that, soil plugging force of vibratory pile was not developed during driving, while it was developed weakly as about 0.5~0.7 times as that of impact pile during static compression loading. and the confining pressure of pressure rhamber had an effect on the soil plugging. In the ultimate loading condition unit soil plugging force did not approach to the failure condition.

내관과 외관이 분리된, 특별하게 제작된 모형 개단 말뚝을 상이한 방법으로 압력토조내에 설치하여 정적 압축 재하 실험을 실시하였다. 개단 말뚝 각 지지부에서의 지지력을 분리.측정하여 개단 말뚝의 지지 메카니즘과 관내토의 폐색 거동 특성을 고찰하였다. 상대밀도 49%의 모형 지반에 타격 관입된 말뚝의 관내토폐색력은 관입도중 20%정도 발휘되고 압축재하시에 대부분이 발휘되며, 토조에 작용된 구속 압력은 관내토 폐색에 크게 영향을 미치지 않았다. 그러나, 진동 관입된 말뚝의 관내토 폐색력은 관입도중에는 전혀 발생하지 않으며, 압축재하시에 약하게 형성되고, 타격 관입말뚝의 그것의 0.5~0.7배 정도가 발휘되는데 토조에 작용된 구속 압력은 관내토 폐색에 크게 영향을 미쳤다. 단위 관내토 폐색력은 극한 상태에서 최대값에 도달하지 않았다. 즉, 극한 상태에서 관내토는 파괴상태에 도달되지 않았다.

Keywords

References

  1. 한국지반공학회지 v.9 no.3 지반조건의 변화가 개단 강관 말뚝의 거동에 미치는 영향 백규호;이종섭;이승래
  2. 한국지반공학회지 v.11 no.2 소형압력토조내에 타입된 말뚝의 인발거동과 극한 인발지지력 결정에 관한 연구 최용규
  3. 杭基礎の設計法とこの解說 日本土質工學會
  4. Proc. of 9th ICSMFE v.1 Behavior of Sand Plugs in Open-ended Steel Pipe Piles Kishida,H.;Isemoto,N.
  5. Proc. of 9th ICSMFE v.1 Analysis of Behavior of Tubular Piles in Subsoil Klos,J.;Tejchman,A.
  6. Proc. of 10th ICSMFE v.2 Bearing Capacity Calculation for Pipe Piles Klos,J.;Tejchman,A.
  7. J. of Geotechnical Engineering v.117 no.8 Load Transfer for Pipe Piles in Highly Pressured Dense Sand O'Neill,M.W.;Raines,R.D.
  8. UHCEE 90~09 Response of Tension Piles to Simulated Seismic Motion in Saturated Fine Sand O'Neill,M.W.;Vipulanandan,C.;Ochoa,M.
  9. 24 th Offshore Technology Conferance Laboratory Scale Modelling of Pullout Beahvior of Bias-loaded Tension Piles During Earthquakes O'Neill,M.W.;Vipulanandan,C.;Ochoa,M.
  10. Pile Foundation Analysis and Design Poulos,H.G.;Davis,E.H.
  11. N. CHRP Synthesis of Highway Practice 42 Design of Pile Foundations Vesic,A.S.
  12. thesis presented to the Univ. of Houston, in partial fullfilment of the requirements for degree of master of science Design and Analysis of an Apparatus to Simulate Density and Stresses in Deep Deposits Wong,D.