김낙경
(Dept. of Civil and Environmental Engrg., Sungkyunkwan Univ.)
,
박종식
(Dept. of Geotechnical Engrg., Research, Korea Institute of Construction Tech.)
,
오희진
(Dept. of Civil and Environmental Engrg., Sungkyunkwan Univ.)
,
한만엽
(Dept. of Civil Engrg., Ajou Univ.)
,
김문영
(Dept. of Civil and Environmental Engrg., Sungkyunkwan Univ.)
,
김성보
(Dept. of Civil Engrg., Chungbuk Univ.)
본 연구에서는 도심지 연약 지반에 적용된 IPS(Innovative Prestressed Support) 흙막이 시스템의 거동을 파악하고 안정성을 확인하였다. 새로운 IPS 흙막이 시스템은 강선의 인장 저항을 이용하여 띠장의 강성을 획기적으로 증가시켜 버팀보의 설치 간격을 대폭 증가시키는 공법이다. IPS 흙막이 시스템이 적용된 현장은 부산 북부 지역 내에 위치한 폭 28.8m, 길이 52.0m 그리고 굴착 깊이 16.1m 규모의 굴착 현장으로서 느슨한 매립토와 연약 점토로 이루어져 있으며 두께 650mm의 지중 연속벽, 5단의 IPS 시스템과 중앙 스트럿으로 지지되어 있다. 시공이 진행되는 동안에 경사계 6 곳, 지하 수위계 4 곳, IPS 띠장에 설치된 변위계 30 곳, 스트럿에 설치된 변형율계 20 곳에서 현장 데이터를 계측 수집하였다. 연약 지반에 적용된 IPS 흙막이 공법은 성공적으로 수행되었다. IPS 흙막이 공법의 시공을 통하여 공법의 적용성을 확인하였으며 현장 계측 결과를 분석하고 예비 설계 내용과 비교하여 연약 지반에서의 IPS 흙막이 공법의 거동을 확인하고 안정성을 평가하였다.
본 연구에서는 도심지 연약 지반에 적용된 IPS(Innovative Prestressed Support) 흙막이 시스템의 거동을 파악하고 안정성을 확인하였다. 새로운 IPS 흙막이 시스템은 강선의 인장 저항을 이용하여 띠장의 강성을 획기적으로 증가시켜 버팀보의 설치 간격을 대폭 증가시키는 공법이다. IPS 흙막이 시스템이 적용된 현장은 부산 북부 지역 내에 위치한 폭 28.8m, 길이 52.0m 그리고 굴착 깊이 16.1m 규모의 굴착 현장으로서 느슨한 매립토와 연약 점토로 이루어져 있으며 두께 650mm의 지중 연속벽, 5단의 IPS 시스템과 중앙 스트럿으로 지지되어 있다. 시공이 진행되는 동안에 경사계 6 곳, 지하 수위계 4 곳, IPS 띠장에 설치된 변위계 30 곳, 스트럿에 설치된 변형율계 20 곳에서 현장 데이터를 계측 수집하였다. 연약 지반에 적용된 IPS 흙막이 공법은 성공적으로 수행되었다. IPS 흙막이 공법의 시공을 통하여 공법의 적용성을 확인하였으며 현장 계측 결과를 분석하고 예비 설계 내용과 비교하여 연약 지반에서의 IPS 흙막이 공법의 거동을 확인하고 안정성을 평가하였다.
The performance of innovative prestressed support (IPS) earth retention system applied in soft clay was investigated and presented. The IPS wale system provides a high flexural stiffness to resist the bending by lateral earth pressure, and transfers lateral earth pressure to strut supports. The IPS ...
The performance of innovative prestressed support (IPS) earth retention system applied in soft clay was investigated and presented. The IPS wale system provides a high flexural stiffness to resist the bending by lateral earth pressure, and transfers lateral earth pressure to strut supports. The IPS wale system provides a larger spacing of support than conventional braced and anchored systems. The IPS earth retention system was selected for temporary earth support in a building construction in North Busan area. The excavation was made 28.8 m wide, 52.0 m long, and 16.1 m deep through loose fill to soft clay. The IPS system consists of 650 mm thick slurry walls, and five levels of IPS wales and struts. Field monitoring data were collected including wall deflections at six locations, ground water levels at four locations, IPS wale deflections at thirty locations, and axial loads on struts at twenty locations, during construction. The IPS earth retention system applied in soft clay performed successfully within a designed criterion. Field measurements were compared with design assumptions of the IPS earth retention system. The applicability and stability of the IPS earth retention system in soft clay were investigated and evaluated.
The performance of innovative prestressed support (IPS) earth retention system applied in soft clay was investigated and presented. The IPS wale system provides a high flexural stiffness to resist the bending by lateral earth pressure, and transfers lateral earth pressure to strut supports. The IPS wale system provides a larger spacing of support than conventional braced and anchored systems. The IPS earth retention system was selected for temporary earth support in a building construction in North Busan area. The excavation was made 28.8 m wide, 52.0 m long, and 16.1 m deep through loose fill to soft clay. The IPS system consists of 650 mm thick slurry walls, and five levels of IPS wales and struts. Field monitoring data were collected including wall deflections at six locations, ground water levels at four locations, IPS wale deflections at thirty locations, and axial loads on struts at twenty locations, during construction. The IPS earth retention system applied in soft clay performed successfully within a designed criterion. Field measurements were compared with design assumptions of the IPS earth retention system. The applicability and stability of the IPS earth retention system in soft clay were investigated and evaluated.
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가설 설정
(1) The IPS earth retention system in soft clay performed s나ccessfhlly. The IPS earth retention system proved to provide a large workspace.
제안 방법
retention system applied in soft clay. A field monitoring was conducted during excavation. The field performance data were collected and analyzed in order to evaluate the stability of the IPS earth retention system, and were compared with the design predictions.
1 m in depth. The IPS system consisted of slurry wall, thirty IPS wales, forty comer struts, and six center struts. As can be seen in Photo 1, the IPS earth retention system in soft clay performed successfully, providing larger workspace than conventional support systems.
The field monitoring began with the start of the slurry wall installation and was conducted in sequence up to the completion of the final ground excavation. The trends of the IPS wall deflection profiles obtained from the inclinometers were analyzed.
A field monitoring was conducted during excavation. The field performance data were collected and analyzed in order to evaluate the stability of the IPS earth retention system, and were compared with the design predictions.
0 m. The wall was internally braced with five levels of IPS wales, comer struts, and center struts.
대상 데이터
The site was surro니nded by the roads, 15 m wide to the north, 15 m wide to the east, and 30 m wide to the south. The eight storied building is located in the vicinity of the west side of the excavation. The Nak-Dong River is located 650 m west away from the site and flows to the south.
North Busan. The excavation was 28.8 m in width, 52.0 m in length, and 16.1 m in depth. The IPS system consisted of slurry wall, thirty IPS wales, forty comer struts, and six center struts.
4 and 5, respectively. The excavation was 28.8 m wide, 52.0 m long and 16.1 m deep. A 650 mm-thick slurry wall was used to support the retained ground and the depth of the wall was 29.
The instruments for field monitoring included six inclinometers, four piezometers, twenty vibrating wire strain gauges, and thirty extensometers. The wall deflections were observed using wall inclinometers during excavation.
1. The site was surro니nded by the roads, 15 m wide to the north, 15 m wide to the east, and 30 m wide to the south. The eight storied building is located in the vicinity of the west side of the excavation.
This project is the construction of an official building, which consists of 10 stories of super-structure and four levels of basement on pile groups. A plan view of site locations is shown in Fig.
데이터처리
The behavior of members of the IPS earth retention system was investigated from analyzing the results of field measurements. The deflection behavior of the IPS wall showed a bulged shape which is quite common in soft clay.
이론/모형
18% of the excavation depth. It was less than the deflection predicted using the Clough and O'Rourke (1990) chart for excavation cases in soft to medium clay. The maximum lateral deflection was less than the 0.
The apparent earth pressures converted from loads on struts in the IPS wall matched with the Terzaghi and Peck's apparent earth pressure diagram. It was recognized that the earth pressure behavior on the IPS wall was similar to those of the braced and anchored walls.
참고문헌 (11)
Clough, G. W., and O'Rourke, T. D. (1990), 'Construction Induced Movements of In Situ Walls', Proc., ASCE Corf. on Des. and Perf of Earth Retaining Struct., Geotech. Spec. Publ. No.25, ASCE, New York, pp. 439-470
Finno, R. J., Bryson, S., and Calvello, M. (2002), 'Performance of a Stiff Support System in Soft Clay', Jour. Geotech. and Geoenvir.. ASCE, Vol.128, No.8, pp. 660-671
Han, M. Y., Kim, M. Y., Kim, S. B., and Park, D. H. (2003), 'Theoretical Study on Flexural Stiffness of Innovative Prestressed Wale', Proceedings of the KSCE Annual Conference 2003, KSCE, pp. 3754-3759
Hashash, Y. M. A., and Whittle, A. J. (1996), 'Ground Movement Prediction for Deep Excavations in Soft Clay', Jour. Geotech., ASCE, Vol.122, No.6, pp. 474-486
Kim, N. K., Park, J. S., Han, M. Y., Kim, M. Y, and Kim, S. B. (2004), 'Development of Innovative Prestressed Support Earth Retention System', Jour. of the KGS, Vol.20, No.2, March 2004, pp. 107-113
Kim, N. K., Park, I. S., Jang, H. J., Han, M. Y, Kim, M. Y, and Kim, S. B. (2005), 'Performance of Innovative Prestressed Support Earth Retention System in Urban Excavation', Jour. of the KGS, Vol.21, No.2, March 2005, pp.1-10
Kim, S. B., Han, M. Y, Kim, M. Y., Kim, N. K, and Ji, T. S. (2005), 'Analysis and Design of Wale in Innovative Prestressed Support (IPS) System', Jour. of the Computational Structural Engineering Institute of Korea, Vol.18, No.1, pp. 79-91
Lee, F. H., Yong, K Y, Quan, K C. N., and Chee, K. T. (1998), 'Effect of Corners in Strutted Excavations: Field Monitoring and Case Histories', Jour. Geotech. and Geoenvir., ASCE, Vol.124, No.4, pp. 339-349
Ou, C. Y, Hsien, P. G., and Chiou, D. C. (1993), 'Characteristics of Ground Surface Settlement During Excavation', Can. Geotech. J., Ottawa, Vol.30, pp. 758-767
Terzaghi, K., and Peck, R. B. (1967), Soil mechanics in engineering practice, 2nd Ed., John Wiley & Sons, Inc., New York, N. Y
Wong, I. H., Poh, T. Y, and Chuah, H. I. (1997), 'Performance of Excavations for Depressed Expressway in Singapore', Jour. Geotech. and Geoenvir. Engrg., ASCE, Vol.123, No.7, pp. 617-625
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