Influence of soil disturbance on metro tunnel in soft clay due to excavation of deep foundation pit

According to the laboratory unit tests on typical soft clay and disturbed soils, the influence of disturbance on the soft clay is analyzed. The results show that the engineering properties of the soft clay are related to its structure and stress state. Due to the disturbance of construction, the yield stress of the soil structure is destroyed, resulting in an increase of its compressibility and a decrease of its strength. Deep excavation will result in disturbance of soft soil foundation, reduce the strength of foundation soils and increase the deformation and exacerbate the impact of construction on the surrounding environment. According to the finite element simulation, the influence of soft clay disturbance on the force-deformation of surrounding metro tunnel is analyzed, and some suggestions for reinforcement measures are proposed. When the base soils are disturbed, the force-deformation of building envelope and nearby metro tunnel structure will be accelerated until failure occurs.