All Issue

2016 Vol.18, Issue 2 Preview Page
Experimental study on the behavior of retaining wall according to underground excavation distance

지하굴착 이격거리에 따른 흙막이벽체 거동에 대한 실험적 연구

Jong-Deok Park1
,
Chang-Kyun Ahn1
,
Do-Youp Kim2
,
Seok-Won Lee3*
박 종덕1
,
안 창균1
,
김 도엽2
,
이 석원3*
1Konkuk University, Dept. of Civil and Environmental System Engineering, Master
2Konkuk University, Dept. of Civil and Environmental System Engineering, Bachelor
3Konkuk University, Dept. of Civil and Environmental System Engineering, Professor
1건국대학교, 사회환경시스템공학과 석사
2건국대학교, 사회환경시스템공학과 학사
3건국대학교, 사회환경시스템공학과 교수
*교신저자. *Corresponding Author. 
31 March 2016. pp. 155-164
PDF XML Citation
Abstract

The changes in earth pressure and ground settlement due to the underground excavation nearby the existing retaining wall according to the separation distance between underground excavation and retaining wall, were studied experimentally. A soil tank having 160 cm in length and 120 cm in height, was manufactured to simulate the underground excavation like tunnel by using 5 separated bottom walls. The variation of earth pressure was measured according to the excavation stages by using 10 separated right walls simulating the retaining wall. The results showed that the earth pressure was changed by the lowering of first bottom wall(B1), however the earth pressure was not changed significantly by the lowering of third bottom wall(B3) since B3 had sufficient separation distance from retaining wall. Lowering of first bottom wall(B1) induced the decrease of earth pressure in lower part of retaining wall, on the contrary, lowering of first bottom wall(B1) induced the increase of earth pressure in middle part of retaining wall proving the arching effect.

Keywords
Earth pressure
Ground settlement
Retaining wall
Model tank

본 연구에서는 지상구조물 건설을 위하여 흙막이 벽체를 이용하여 지하굴착이 이루어진 지역에 근접하여 새로운 지하공간이 신설될 때, 지하굴착과 흙막이 벽체간의 이격거리에 따른 흙막이 벽체에 작용하고 있던 토압의 변화 및 지표 침하 변화를 실험적으로 연구하였다. 지하공간 굴착 단계별로 흙막이 벽체의 토압 변화 및 지표 침하를 측정할 수 있는 길이 160 cm, 높이 120 cm의 모형 토조를 제작했다. 실험은 균일하게 조성된 사질토 지반에서 하부 지반에 변위를 가하고, 수직한 흙막이 벽체의 토압 변화 및 지표면 침하를 확인하는 방식으로 수행하였다. 모형실험은 인접한 지하공간 굴착에 따른 흙막이 벽체의 높이별 토압을 측정하기 위하여 흙막이 벽체를 모사하는 우측 벽체 10개 및 지하공간 굴착을 모사하는 하부 벽체 5개로 구성하고 하부벽체를 거동시킴으로서 지하굴착을 모사하였다. 실험 결과, 하부 1단 벽체의 거동 시에는 흙막이 벽체의 토압에 변화가 발생하였으나, 하부 3단의 경우는 지하 굴착이 흙막이 벽체와 충분히 이격되어 토압변화가 크게 발생하지 않았다. 하부 1단 벽체를 굴착한 결과, 우측 하단부 벽체 주변의 응력이 감소되고, 우측 중간부 벽체 주변으로 응력이 재분배되는 아칭현상을 증명할 수 있었다.

키워드
토압
지표면 침하
흙막이 벽체
모형 토조
References
1
1.Jeon, J.-H., Park, J.-D., Lim, Y.-D., Lee, S.-W. (2013), “Damage assessment of structures according to the excavation methods”, J. of Korean Tunnelling and Underground Space Association, Vol. 15, No. 2, pp. 161-173.
2
2.Kim, I., Lee, S.-D. (2007), “Behavior of tunnel due to adjacent ground excavation with pre-loading on braced wall”, Journal of the Korean Geotechnical Society, Vol. 23, Issue 10, pp. 163-174.
3
3.Lee, J.-M., Lee, S.-D. (2010), “Behavior of building lower part passage tunnel due to adjacent ground excavation”, Tunnel and Underground Space, Vol. 20, No. 5, pp. 369-377.
4
4.Park, J.-D., Yu, J.-S., Kim, D.-Y., Lee, S.-W. (2015), “Experimental study on the ground movement due to consecutive construction of retaining wall and underground space in cohesionless soil”, J. of Korean Tunnelling and Underground Space Assoc-iation, Vol. 17, No. 3, pp. 267-281.
5
5.Seo, H.-J., Lee, K.-H., Han, S.-I., Lee, I.-M. (2012), “A numerical study of pillar reinforcing effect in underground cavern underneath existing structures”, J. of Korean Tunnelling and Underground Space Association, Vol. 14, No. 5, pp. 453-467.
6
6.Son, M. (2003), “The response of buildings to excavation-induced ground movement”, Ph.D disser-tation, University of Illinois at Urbana-Champaign.
7
7.Son M.-R., Yun, J.-C. (2010), “Comparison of ground movements in a single ground layer and multiple ground layers due to nearby tunnel excavation”, J. of KSCE, Vol. 30, No. 3C, pp. 167-174.
8
8.Tang, Y.G., Kung, G.T.C. (2010), “Investigating the effect of soil models on deformations caused by braced excavations through an inverse-analysis technique”, Computers and Geotechnics, Vol. 37, pp. 769-780.
Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 18
  • No :2
  • Pages :155-164
  • Received Date : 2016-01-28
  • Revised Date : 2016-02-04
  • Accepted Date : 2016-03-21
  • DOI :https://doi.org/10.9711/KTAJ.2016.18.2.155
Journal Informaiton Journal of Korean Tunnelling and Underground Space Association Journal of Korean Tunnelling and Underground Space Association
Online Submission & Review System
  • NRF
  • KOFST
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close