| With the advancement of urbanization and modernization in China, the traffic congestion and parking problems become increasingly prominent, how to tense and expand the parking space under the background of land resources is particularly important. A new type of cylindrical underground garage is using cylindrical underground continuous wall- floor support form of combined supporting, this type of garage is relatively rare, and the theoretical of the combination mechanism and the characters are far behind in the engineering practice. Therefore, for the analysis of stress and distortion of supporting structure and the various factors on the structure of the influence of stress and displacement, it is necessary to research on this type of garage, the conclusion helps to guide the design and construction of underground garage. Based on lots of relevant documents and design data, combined with a cylindrical underground garage project, the study mainly includes the following work:In this paper, the engineering characteristics of cylindrical underground garage were summarized, from the perspectives of design and construction, this paper introduces two types of cylindrical underground garage structure, different types of supporting for different parking conditions. On the basis of previous research, design and calculation theory of soil pressure is discussed in the underground garage.Because of the complexity and timeliness of soil, this article based on the constitutive relation of soil, underground diaphragm wall and round slabs models and their contact with the soil surface model, taking into account the soil, supporting wall and round slabs as dimensional whole, using ABAQUS to finish the numerical simulations. Calculating the foundation pit bottom soil resilience under different conditions of soil uplift, the distortion and stress of the supporting structure. This article study the construction process, the elasticity modulus of supporting wall, soil modulus and round slabs stiffness on the impact of supporting walls and round slabs of internal forces and distortion. According to the results of the simulation, this article propose the corresponding response in the design and construction process.Through the cylindrical supporting structure and the round slabs for equivalent simplified by considering the round effect equivalent supporting arch method of cylindrical underground garage with design software, from the inner supporting structure of axial force, horizontal displacement of top supporting pile and bottom displacement, pile bending moments of the Foundation Pile Bracing analysis, find out the trends of the internal force and distortion, to carry on the discussion on the mechanism of its action. Finally, the results of numerical simulation are compared.The dynamic response of cylindrical underground garage under horizontal seismic load have been briefly analyzed. The conclusion can provide the theoretical basis for the design of underground garage for the earthquake resistance.Combined with the engineering practice, from two aspects of numerical simulation and design calculation to study the cylindrical supporting wall. Due to the interaction between supporting wall and round slabs, which can effectively control the distortion of supporting structure and improve the stability of excavation, the results can play the role for the design and construction of the cylindrical underground garage. |
