A Study on the Behavior of PHC-W Retaining Wall Method Based on the Numerical Analysis Results

Jeong Pyo Choi; Hong Min Jin; Chea Min Kim; Sung Su Kim; Yongkyu Choi

doi:10.7843/kgs.2017.33.2.5

All Issue

2017 Vol.33, Issue 2 Next Page

A Study on the Behavior of PHC-W Retaining Wall Method Based on the Numerical Analysis Results 수치해석 결과를 이용한 PHC-W흙막이공법의 거동에 관한 연구

28 February 2017. pp. 5-15

PDF XML

Abstract

PHC-W retaining wall method is one of the economical retaining wall methods. PHC-W pile used in PHC-W retaining wall method has special shape with flat surfaces so that the PHW-C retaining wall, with overlapped piles, shows outstanding vertical control and impermeability. In order to evaluate two types of retaining walls, numerical analysis were performed. The selection of cases depended on N values of the ground and ground properties, and two types of PHC-W retaining walls (defined as type A and B) were constructed. For a case that consists of inorganic clay and sand with less than 30 of N value, the maximum excavation depths for type A and B were respectively 10.5 m and 11.0 m. At the other case of which N value is above 30, the depths were 17.0 m and 19.5 m. From the results, it was found that maximum excavation depth, horizontal displacement, and safety factor for flexural strength of the wall were influenced by ground properties.

Keywords

PHC-W retaing wall method

PHC-W pile

Maximum excavation depth

Horizontal displacement

Flexural strength

PHC-W 흙막이공법은 말뚝의 원형단면을 개량하여 전면부의 평면화로 지보재의 설치가 용이하며 중첩(over-lap)시공이 가능하여 차수와 수직도가 우수하고 H형강을 사용하지 않아 경제적인 흙막이공법이다. 지층조건이 다른 3가지 사례를 이용하여 수치해석을 실시하였다. N치가 30미만의 지층에서는 PHC-W흙막이 A 형, B 형 각각에서 10.5m, 11.0m정도 굴착 가능한 것으로 나타났다. N치가 30이상의 비교적 양호한 지반에서는 PHC-W흙막이 A 형, B 형 각각에서 17.0m, 19.5m정도 굴착 가능한 것으로 나타났다. 지층조건이 양호할수록 굴착 가능 깊이가 커지는 것으로 나타났고 수평변위는 작아지는 것으로 나타났으며, 휨강도 안전율은 낮아지는 것으로 나타났고 전단력 안전율도 낮아지는 것으로 나타났다.

References

Barun Soil Institute (2016), Design Report of Earth Retaining Walls and Foundations for Main Shopping Center in Kyeungnam, Barun Soil Institute, pp.6-9.

Choi, J. P. (2014), Study on the Economic Analysis of Retaining PHC-W Method Improved High Strength Pile, Master’s Thesis, Busan National University, pp.25-33.

Choi, Y. K. (2015), Industrialization and quality upgradibility of PHC-W earth retainig wall method, The final report of Industry- university-Institute Collaborated technical development project of Small and Medium Business Administration, pp.20-22.

Korea Expressway Corporation (2009), Road Design Manual, Korea Expressway Corporation, Korea, p.68.

Korean Geotechnical Society (2008), Excavation and earth retaining wall method, Geotechnical Engineering Series, No.3, Goomibook, p.453.

Korean Geotechnical Society (2016), Design Specification of Foundation of Structure, Vol.3, Goomibook, p.153, 345.

MS Entech Co. Ltd. (2015), Design Report of Earth Retaining Wall for Complex in Busan, MS Entehch, pp.5-6.

Oh, J. H. and Cho, C. H. (2004), The Earth Retaining Wall Engineering, Goomibook, Korea, p.148.

Youhan Industrial Co. Ltd. (2012), Site Investigation Report for JACE Apartment in Busan, Youhan Industrial, pp.30-32.

Information

Publisher :The Korean Geotechnical Society
Publisher(Ko) :한국지반공학회
Journal Title :Journal of the Korean Geotechnical Society
Journal Title(Ko) :한국지반공학회 논문집
Volume : 33
No :2
Pages :5-15
Received Date : 2016-11-11
Revised Date : 2016-12-29
Accepted Date : 2017-02-02
DOI :https://doi.org/10.7843/kgs.2017.33.2.5

Journal of the Korean Geotechnical Society ISSN:1229-2427(Print) 2288-646X(Online) 한국지반공학회 논문집

All Issue