본 연구에서는 사질토 지반에서의 굴착단계별 연성 벽체의 거동분석을 수행하기 위해 흙막이벽의 모형실험을 실시하였다. 모형 흙막이벽 실험에서는 재료의 역학적 특성이 비교적 널리 알려진 주문진 표준사를 이용하여 상대밀도가 79%, 41%, 24%인 모형지반을 조성한 후 모형벽체의 연성지수를 변화시켜 각 굴착단계별로 배면지반과 연성 벽체의 거동특성을 규명하였다. 본 연구에서는 벽체의 수평변위, 벽체의 배면에 작용하는 수평토압, 굴착으로 인한 배면지반의 침하량 및 침하영향거리, 벽체에 작용하는 앵커의 하중, 그리고 벽체에 작용하는 휨모멘트와 축력에 대해 굴착단계에 따라 살펴보고 이를 토대로 지반과 벽체의 거동특성을 분석하였다.
In this study, a total of 12 types of sequential model tests were conducted at the laboratory for small scale anchored walls. The sequential behavior for flexible wall embedded in sand was investigated by varying degrees of relative density of Joomoonjin sand and flexibility number of model wall. The model tests were carried out in a 1000mm width, 1500mm length, and 1000mm high steel box. Load cells, pressure cells, displacement transducer and dial gauges were used to measure the anchor forces, lateral wall deflections, lateral earth pressures and vertical displacements of ground surface, respectively. Limited model tests were performed to examine the parameters for soil-wall interaction model and the formulation of analytical method was revised in order to predict the behavior of anchored wall in sand. Based on the model tests and proposed analytical method, model simulations were performed and the predictions by the present approach were compared with measurements by the model tests and predictions by other commercial programs. It is shown that the prediction by the present approach simulates qualitatively well the general trend observed for model test.
