摘要:
With the rapid development of utility tunnel in the world, the types and capacity of it in urban underground utility tunnel are becoming very large, and the traditional approach can not meet the needs of development. In order to m...
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With the rapid development of utility tunnel in the world, the types and capacity of it in urban underground utility tunnel are becoming very large, and the traditional approach can not meet the needs of development. In order to make rational use of underground space and solve the problem of laying underground structure in cities, the state has vigorously promoted the construction of utility tunnel. The utility tunnel refers to the public facilities which are built underground and used for centralized laying of municipal utility tunnel in accordance with unified planning, design, construction and maintenance. So far, China has more than 69 city in the construction of utility tunnel, many scholars have conducted research on seismic of utility tunnel, but most of the studies are based on the homogeneous soil without considering the non-uniformity of soil, in fact the place where the condition of geological change greatly is damaged badly of the underground structure, such as the boundary of hard soil and soft soil. Because of the difference of soil mass will produce large relative displacement at the boundary under the action of earthquake, which will cause the structure to be destroyed easily. In this thesis, the ABAQUS finite element software is used to simulate the response characteristics of the utility tunnel under the action of transverse and longitudinal earthquakes. The main research contents of this thesis are as follows: Introduces the utility tunnel advantages; summarizes the development and seismic research status of utility tunnel at home and abord; summarizes the main content and significance of this study. Discussion several key theories of utility tunnel ABAQUS software modeling, including: the constitutive model of soil, concrete damage plasticity model, the establishment of artificial boundary conditions, the interaction between soil and utility tunnel and the method of ground motion input, in the end, the artificial boundary conditions have been tested and verified. By using the numerical simulation, analyzed the response of utility tunnel in the inhomogeneous field under transverse seismic excitation. The acceleration response law of soil mass, the interaction of soil and utility tunnel, the acceleration response rule of utility tunnel and the law of displacement and stress change in utility tunnel are studied systematically. By using the numerical model, analyzed the response of utility tunnel in the inhomogeneous field under longitudinal seismic excitation. The acceleration response law of soil mass, the interaction of soil and utility tunnel, the acceleration response rule of utility tunnel and the law of displacement and stress change in utility tunnel are studied systematically. Finally, the seismic response of the utility tunnel is summarized, which provides a basis for seismic design of the utility tunnel in the inhomogeneous field.
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