چكيده به لاتين
Abstract:
Urban development requires deep excavation adjacent buildings and structures. Deep excavations show the the necessity of better use of space due to population increase. In many large cities of the world that have crowded areas with a lack of space for buildings and underground projects, the need for maximum use of land is highly regarded and considered. This has led to the construction of high-rise buildings, commercial and residential buildings with numerous underground floors. Therefore, by increasing the depth of excavation, choosing the method of implementation, cost management, and performance quality requires special attention. There are so many incidents of unauthorized recruitment in urban areas. One of the common methods of excavation in Iran in recent years is the top-down excavation and construction of the structure. In this research, the benefits and challenges of this method in Iran and the world have been studied. In this case the basement floors are constructed as the excavation progresses. The top-down method has been used for deep excavation projects where tieback installation was not feasible and soil movements had to be minimized. The top-down method has recently been introduced to meet the new urban construction requirements. The most important advantage of this method is the construction time due to the concurrence of excavation and construction of the structure and the possibility of excavation in the vicinity of highly sensitive structures.The three-dimensional numerical modeling of the top-down method is the main goal of this study. In this research, using PLAXIS finite element software, the soil and structure were modeled in a three dimensional manner, taking into account the interaction between the soil. By performing different parametric studies, I tried to optimize the method of operation that imposed the least deformation on the structure.
