深基坑对周边建筑结构的影响及应对措施
[Abstract]:With the rapid development of urbanization and construction industry in our country, the land resources of the city are becoming more and more tense, and the density of urban buildings is increasing. In order to make effective use of land, a large number of high-rise and underground buildings appear in urban buildings. Subsequently, the application of deep foundation pit is more and more extensive and the scale is also larger and larger. However, in the construction process of deep foundation pit, if the protective effect is not appropriate, it will have a certain impact on the adjacent buildings and surrounding facilities. For example, in the process of foundation pit construction, the surrounding building structure may appear local damage, underground pipeline fracture, surrounding pavement collapse, serious will threaten the safety of the building itself, because it is very difficult to recover after foundation pit deformation, so the countermeasures in this paper are mainly aimed at the reinforcement of building structure. In this paper, the influence of deep foundation pit construction on the foundation displacement and internal force of frame structure buildings in different areas and distances is studied, and the local damage caused by foundation deformation is also studied. In this paper, the influence of foundation pit on building is analyzed by numerical simulation, in which the finite difference software FLAC.3D, is used to simulate the foundation pit. The finite element software ETABS. is used to simulate the foundation pit. The specific research contents are as follows: (1) in this paper, the buildings in different areas around the foundation pit are divided into two categories. When the buildings are perpendicular to the long side of the foundation pit and change from the near and far positions, the relative displacement of the foundation increases at first and then decreases, and turns about 20 meters from the long side of the foundation pit. The change of internal force follows the same law. When the building is in the parallel direction of the long edge of the foundation pit, when the position changes from the midpoint of the long edge of the foundation pit to the two sides, the relative displacement increases at first, but then decreases, but the internal change of the building structure is the same in the process of moving, so it is not difficult to find that there is a strong correlation between the two. (2) the absolute value of the displacement of the building foundation in the process of layered excavation is not always increasing. For example, when the excavation reaches a certain depth, the vertical displacement begins to rebound, and its absolute value decreases with the excavation, that is, the change appears a turning point. In the process of foundation pit construction, special attention should be paid to the turning point of the displacement, because the movement direction of the soil may change at this time, the monitoring of foundation pit deformation should be strengthened, because the vertical relative displacement is increasing, so the internal force of the building is still increasing. Through reading the literature, it is found that there are two kinds of foundation pit excavation simulation methods, that is, primary excavation and layered excavation. In this paper, the results of the two excavation methods are compared. The settlement of the foundation and the internal force of the structure obtained by the layered excavation are larger, and the layered excavation is more in line with the real process of the foundation pit excavation. (3) in this paper, structural reinforcement is taken as the specific response measure, and the building around the foundation pit is selected. Because the building here already exists and is already in use, the reinforcement should not be carried out in a large area, and the reinforcement speed should be fast, can not take too long, and can not affect the normal life of the residents. Therefore, this paper chooses the outer section steel method to reinforce the beam and column members. In this paper, the foundation displacement and internal force of structures with different positions and distances around the foundation pit are analyzed, and some conclusions are obtained, which hope to provide some references for practical engineering.
【学位授予单位】:西安工业大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TU473;TU318
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