Abstract: Abandoned mine pits around the city are gradually constructed for large-scale public service projects. However, new technical problems emerge due to taking the slope as the foundation of buildings. A large-scale shaking table test was carried out to study the dynamic displacement and internal force of pit slope, single-span frame structure and multi-span frame structure. Results show that dynamic response of the model is influenced by seismic wave type, amplitude and direction. Moreover, different seismic waves have different impacts on the dynamic displacement and internal force of the model. It is found that dynamic displacement increases with the increase of excitation amplitude. In addition, dynamic displacement caused by the bi-directional excitation is larger than that of the single one, and the displacement in the same direction as the excitation is greater than that in other directions. Under the high-intensity earthquake excitation, the ability of multi-span structure to control displacement is stronger than that of single-span structure, while column internal force is higher. By considering the interaction between structure and foundation, the structure with good integrity and high stiffness can improve the seismic performance of the foundation. Results show that the peak and permanent displacements of multi-span structure foundation are 2.5%-8.8% and 13.6%-62.1% lower than those at free zone site, respectively. Therefore, this study is helpful to reveal the failure mechanism of pit slope under the earthquake, and provides a useful reference for the seismic design of the slopes and structures.

Key words: existing pit, slope, structure, interaction, shaking table test