Study on the Disturbance and Influence Zoning of Shield Tunneling on Shallow Foundation Buildings
The disturbance effect of shield tunneling on the upper buildings in soft soil is obvious.Based on the typical soft soil layer,simulate the disturbance effect of shield tunneling passing through shallow foundation buildings at different spatial positions.The variation law of surface settlement is analyzed.The internal force and deformation characteristics of shield tunneling under independent foundation,raft foundation and box foundation buildings are explored.Based on the composite criterion and strength reduction method,the influence zoning of shield tunneling under buildings in soft soil layer is studied.The results show that the building settlement increases first and then decreases with the increase of tunnel depth,and reaches the maximum when the tunnel depth(H)=12 m.The increase of tunnel depth will lead to the decrease of horizontal inclination of buildings,and the maximum inclination value appears at H=6 m.The sudden change point of the safety factor ratio curve of tunnel lining and surrounding rock can be used as the boundary of strong and weak influence zones.The research results can provide reference for the disturbance analysis of shield tunneling on shallow foundation buildings and the division of influence areas in soft soil area.
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