Measurement analysis of the influence of subway station construction to the adjacent building and ground surface deformation

摘要

According to the tracing monitoring results of surface settlement and deformation of method of PBA in large-span tunnel used in the construction of the of Shenyang subway station, the analysis shows the ground surface settlement characteristics and laws influenced by the process of tunnel excavation influence. The result shows that the influence to formation of soil disturbance is large, the step sequences influence the deformation of the surface subsidence obvious are the small pilot drift excavation and the buckle arch of the first lining, accounting for about 70% of the final settlement, while the other is smaller, therefore the key of the project is to control the ground surface settlement of the small pilot drift excavation and the buckle arch of the first lining. Analysis also shows that, the effect of grouting consolidation in the upper strata in the arch crown and surrounding rock foundation of buildings before the construction to reduce the surface subsidence and building deformation is obvious.