Study On Influence Of The Settlement Of Buildings With Different Positions By Shield Tunneling In Soft Soil Layer

The settlement of building is influenced by the positional relation of the tunnel and the building while the shield tunneling in soft soil layer. It plays an important guiding role in the subway construction to reduce the impact on the building settlement when the shield tunneling under buildings of different position through optimization and control during the design and construction process. In this thesis, the law of the settlement of different buildings with different positions caused by the shield tunneling was studied through on-site monitoring, theoretical study and numerical simulation based on the examples of Suzhou Metro Line2projection.The contents in this paper includes the following several aspects:(1)The geometric and mechanical effects of shield tunneling was analyzed. The development of the ground settlement and the reasons that caused the settlement were discussed. The mechanism of the influence on the neighbor building settlement of the shield tunneling and the reasons that caused the building settlement were studied.(2)The impact on the ground surface and the building settlement of the shield tunneling was discussed from the perspectives of crossing angle, deviation ratio, and the ratio of tunnel depth and radius, based on the numerical simulation in FLAC3D.(3)The impact on the building settlement of crossing angle, deviation ratio, and the ratio of tunnel depth and radius was analyzed. According to the analytical conclusion and the measured data, some advices adapting to the soft soil layer in SuZhou were proposed to control the building settlement development caused by the shield tunneling.