Study On An Underground Retaining Wall To Reduce The Settlement Of A Building Near A Deep Foundation Pit

The development of underground space and construction of more high-rise buildings in urban areas have made deep pits increase in number, in scale, and in depth as well. Dense buildings generally surround the deep foundation pits in urban areas with little space empty. Sometimes, the pit is very close to the foundations of the nearest buildings or structures, which results in inevitable difficulties in supporting deep foundation pit if the traditional design theory (Strength-controlling design) and construction technology are used. Under this complicated condition, the interaction between support structures of the foundation, the ground and the adjacent buildings, and the deformation and inner reaction of adjacent building during excavating a foundation pit should be taken into consideration during the design and construction. In this dissertation, an integrated system consisting of deep foundation pit, supporting structure and adjacent structure is studied, and the excavation process of a deep foundation pit is simulated by means of large-scale software-Flac and software-Ansys. The deformations of adjacent building and supporting structure are analyzed under different conditions, including: (a) different spacings between deep foundation pit and adjacent building, (b) different depths of underground retaining wall. From the analyses, the law is discovered on deformation of supporting structure and asymmetrical settlement of adjacent building, and the conclusions are obtained that are valuable to designing and construction of deep foundation pit. So that the findings in this dissertation can be used as reference when further relevant numerical simulation and research are carried on.