연약지반의 굴착공사로 인한 피해 구조물 복구와 가시설 설계 방법에 대한 고찰

Abstract

Excavating works in densely populated urban areas lead to subsidence of the surrounding ground, causing considerable damage to adjacent buildings. The main causes of the subsidence of the surrounding ground include the ground characteristics, wall displacement, depth of excavation, and groundwater level change. Especially, in coastal area of ​​Nakdong River estuary in ​​Busan, particulated sedimentary clay layers are deposited thickly to form soft ground, . And recently, damage cases by excavating works are frequently occurring. Damage caused by proximity drilling may cause the loss of technical credibility and enormous economic loss due to the suspension of construction and legal action. Therefore, it is necessary to examine the design method of temporary facility, especially which is in soft ground. Therefore, in this study, we investigated the properties of the ground structure based on the results of the reinvastigated soil surveying of site regarding to the subsidence of the building which is adjacent to the Ha-dan dong excavating work in Busan, and compare it with the original ground conditions. Also evaluated the behavior of the surrounding ground and the stability of adjacent buildings using original method of design and Finite Element Analysis and compared the two methods. The accuracy of the ground survey and the design method by finite element analysis were found to be closer to reality than the traditional classical method