Experimental study on the ground movement due to consecutive construction of retaining wall and underground space in cohesionless soil

Jong-Deok Park; Jeong-Seon Yu; Do-Youp Kim; Seok-Won Lee

doi:10.9711/KTAJ.2015.17.3.267

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Experimental study on the ground movement due to consecutive construction of retaining wall and underground space in cohesionless soil 사질토 지반에서 흙막이벽체-지하공간 연속 굴착에 따른 지반거동에 대한 실험적 연구

31 May 2015. pp. 267-281

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Abstract

The ground movement and changes in earth pressure due to the consecutive construction of retaining wall and underground space were studied experimentally. A soil tank having 160 cm in length and 120 cm in height, was manufactured to simulate the vertical excavation like retaining wall by using 10 separated right side walls and underground space excavation like tunnel by using 5 separated bottom walls. The variation of earth pressure and surface settlement were measured according to the excavation stages. The results showed that the decrease of earth pressure due to the wall movement can cause the increase of earth pressure of the neighboring walls proving the arching effect. Experiments simulating continuous construction sequence also identified arching effect, however only 50% of earth pressure was restored on the 10th right side wall due to the movement of 1st bottom side wall unusually.

Keywords

Ground movement

Underground space

Retaining wall

Model tank

본 연구에서는 흙막이벽과 같은 수직굴착과 터널과 같은 지하공간의 연속적인 굴착에 따른 지반 거동과 토압 변화를 실험적으로 연구하였다. 굴착 단계별로 벽체 거동, 토압 변화, 그리고 지표 침하의 측정이 가능한 길이 160cm, 높이 120cm의 모형 토조를 제작하였다. 실험은 균일하게 조성된 사질토 지반에서 벽체에 임의의 변위를 가하고, 토압 변화와 지표 침하를 확인하는 방식으로 수행하였다. 모형실험은 흙막이벽과 지하공간의 연속적인 시공을 모사하기 위하여 흙막이벽 굴착을 모사하는 우측벽체 10개 및 지하공간 굴착을 모사하는 하부벽체 5개를 순서대로 거동시켜 모사하였다. 실험 결과, 벽체의 주동변위로 감소된 토압이 주변 벽체로 분담되는 아칭현상이 모든 벽체에서 발생함을 확인하였다. 연속되는 시공을 모사한 실험에서 phase마다 아칭현상을 확인할 수 있으나, 하부1단 벽체의 거동 시, 우측10단 벽체는 다른 경우와 달리 토압이 50%정도만 회복됨을 보였다.

키워드

지반거동

지하공간

흙막이벽

모형토조

References

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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 : 17
No :3
Pages :267-281
Received Date : 2015-04-10
Revised Date : 2015-04-24
Accepted Date : 2015-04-28
DOI :https://doi.org/10.9711/KTAJ.2015.17.3.267

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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