Load Transfer to the Adjacent Ground Induced by the 3-Dimensional Active Displacement

Byung Suk Park; Sang Duk Lee

doi:10.7843/kgs.2015.31.10.49

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2015 Vol.31, Issue 10 Preview Page Next Page

Load Transfer to the Adjacent Ground Induced by the 3-Dimensional Active Displacement 3차원 주동변위에 따른 인접지반으로의 하중전이

31 October 2015. pp. 49-60

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Abstract

Since previous studies on the 3-dimensional earth pressure have been conducted focusing on the stability of wall, it is very difficult to find a study on the load transfer to the adjacent ground induced by the 3-dimensional active displacement. Therefore, in this study, we tried to find out the load transfer to the adjacent ground induced by the 3-dimensional active displacement depending on the size of rectangular wall which was defined by the aspect ratio, that is, the ratio of the height to the width of the wall. 3-dimensional model tests were performed in order to measure the distribution and the magnitude of load transfer to surrounding grounds. The transferred load was 17.9～30.6% less than the difference between the 3-dimensional active earth pressure and earth pressure at rest. The transferred load of both vertical and horizontal was maximum at the boundary of the active wall. The load transfer range depended on the normalized height of the active wall, and it was 0.67～1.29w in horizontal direction and 1.0～3.0h in vertical direction. The transferred load in horizontal was maximum at the height of the wall. As the aspect ratio increases the location of the maximum transferred load points becomes higher. The ratio of the transferred load area of 56～79% at 0.25w in horizontal direction and 50～58% at 1.0～1.5 in vertical direction. Diagrams showing the distribution and the magnitude of the transferred load depending on the aspect ratio were suggested.

Keywords

Wall model test

Aspect ratio (h/w)

3-Dimensional earth pressure

Distribution and the magnitude of load transfer

diagram

기존 3차원 토압연구는 벽체에 작용하는 주동토압을 단일파괴체로 가정하고 벽체의 안정성에 초점을 맞춰 3차원 토압의 크기를 구하는데 역점을 두었고, 토압의 주변지반 전이에 대한 연구는 미진하였다. 따라서 본 연구에서는 벽체의 폭과 높이의 비 즉, 종횡비를 달리하여 3차원 모형실험을 수행하고, 주변지반으로 전이되는 토압의 크기와 영향범위를 파악하였다. 주변지반으로 전이되는 토압은 종횡비에 따라 3차원 주동토압의 감소량보다 17.9～30.6% 작게 나타났으며, 연직방향 토압의 전이보다 수평방향 토압의 전이가 크게 나타났다. 토압의 전이범위는 수평방향으로 주동벽체 폭 w 기준으로 0.67∼1.29w, 연직방향으로 주동벽체 높이 △h기준으로 약 1.0～3.0h인 것으로 나타났다. 수평방향으로 전이되는 토압은 종횡비가 같을 때 수평방향 모두 동일한 높이에서 최대치를 나타내며, 종횡비가 증가함에 따라 토압의 최대 전이 지점이 벽체 하부에서 상부로 변화하였다. 수평방향 토압의 전이는 주동벽체 폭 w 기준으로 0.25w에서 56%∼79%인 것으로 나타났으며, 연직방향 토압의 전이는 주동벽체 △h기준으로 1.0∼1.5h에서 50%∼58%인 것으로 나타났다. 종횡비에 따라 전이되는 토압의 크기와 영향범위를 분석하고 주동변위 벽체 주변으로 전달되는 3차원 하중전이 분포도를 제시하였다.

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Information

Publisher :The Korean Geotechnical Society
Publisher(Ko) :한국지반공학회
Journal Title :Journal of the Korean Geotechnical Society
Journal Title(Ko) :한국지반공학회 논문집
Volume : 31
No :10
Pages :49-60
Received Date : 2015-09-02
Revised Date : 2015-09-24
Accepted Date : 2015-09-30
DOI :https://doi.org/10.7843/kgs.2015.31.10.49

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

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