Abstract
The impact of shallow tunnel construction on the surrounding environment is often considered as a symmetric half-plane problem with circular holes. In this research, the analytical solutions of the ground stresses and displacements of a shallow circular tunnel in an elastic half-plane under arbitrary distributed loads on ground surface were derived, based on the complex variable method. Then, an application was implemented to analyze the potential plastic zone induced by shallow tunneling adjacent to the ground surface structures. The verification of the results obtained from the proposed analytical prediction model was carried out using the numerical simulations. Additionally, the influences of different boundary condition (different magnitudes and ranges of arbitrary distributed loads and different symmetric boundary conditions of the tunnel perimeter) on the distribution characteristics of the potential plastic zones were analyzed. In general, the results showed that the larger the pile loads and the closer the relative position between the tunnel and distributed loads, the more distinct the coalesced trends of the potential plastic zones around the tunnel and the potential plastic zones around the distributed loads.
Highlights
As people pay increasingly more attention to environmental protection and ground transportation becomes busier, the underground excavation method is replacing the cut and cover method to become the most popular construction method [1]
The results show that the potential plastic zones around the tunnel and around the ground surface structure coalesced when the magnitude of distributed load q was big enough, while if the magnitude of the distributed load q was relatively small, the potential plastic zones separated into two parts
The results indicated that different tunnel boundary conditions greatly affected the distribution characteristics of the potential plastic zones
Summary
As people pay increasingly more attention to environmental protection and ground transportation becomes busier, the underground excavation method is replacing the cut and cover method to become the most popular construction method [1]. The solutions of the ground stresses and displacements of a shallow circular tunnel considering the influence of arbitrary distributed loads on ground surface were derived using the complex variable method. An application was implemented to analyze the potential plastic zone induced by shallow tunneling and loads of the ground surface structures. Results obtained from the boundary condition magnitudes and rangesformula. Of the arbitrary distributed loads; boundary different simulations to verify(different the correctness of the theoretical. The influences of different symmetric boundary conditions of the tunnel perimeter) on the distribution characteristics of the condition Boundaryplastic conditions the tunnel perimeter) on the distribution characteristics of the potential plastic zones were analyzed
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