ABSTRACT
Currently, most of the underground air-raid shelters are old, which not only present stability problems but also have a serious impact on the deformation of the superstructure. Therefore, it is necessary to analyze the stability of the underground air-raid shelter in the new building area to reduce its influence on the new building. In this paper, for the selection of a new building with an air-raid shelter with different burial depth and direction under the foundation of the main building and the skirt building, the stability of the air-raid shelter was calculated and analyzed by using the unloading arch theory. Then Plaxis 3D finite element software was used to establish the calculation model, and the finite element calculation of the deformation of the air-raid shelter under different working conditions was carried out. The stability of the air-raid shelter was analyzed according to the calculation results. The results exhibited that: the deformation of the air-raid shelter under the main building was far beyond the prescribed critical value after the excavation of the foundation pit and the completion of the superstructure; therefore, it needs to be backfilled. The deformation of the air-raid shelter below the skirt was slightly higher than the critical value, which can meet the stability requirements after taking the corresponding reinforcement measures. The research results can provide some guidance for the treatment of air-raid shelters under new buildings.
