Influence of analysis method on evaluation of building settlement due to neighboring tunnel construction
Keywords:
Tunnel excavation, Numerical analysis, Interaction, Finite element, Pile supported structureAbstract
In dense urban areas, the tunnel construction close to the existing buildings becomes unavoidable. The excavation affects settlements of the buildings and may cause structural damage. Therefore, proper evaluation of this impact is necessary. In the current engineering practice, there are various methods with different degree of complexity to compute the building settlements due to adjacent tunneling. Each method provides different results in terms of both settlement magnitude and behavior. This study compares and discusses the computed results of pile settlements due to nearby tunneling from four different analysis methods. These includes 1) green field settlement prediction using Gaussian curve; 2) green field settlement by finite element method (FEM); 3) settlement of piles embedded in ground by FEM and 4) settlement of piles under loading by FEM. The results indicated that the most complicated method which considers the piles under loading provides satisfactory behavior and results as the pile settlements in transverse and longitudinal directions become maximum. However, simpler methods may be used, depending on the relative position between the tunnel and pile.
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