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Experimental Study on the Influence Zoning on Existing Pile Foundations Induced by Tunnelling
(1. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070; 2. Anhui Transport Consulting and Design Institute Co., Ltd., Hefei 230088)
Abstract To investigate the impact on the mechanical effects and deformation of existing pile foundations due to subway tunnel excavation, a combined approach of theoretical analysis and model test was adopted. The study analyzed tunnel excavation-induced soil disturbances, stress characteristics of existing pile foundations, and the interaction between tunnels and piles. The results reveal that: (1) The disturbance deformation region caused by tunnel excavation is primarily concentrated within four times the tunnel diameter on both sides of the tunnel axis. The disturbance degree of the surrounding soil increases as excavation progresses, and the additional bending moment of the pile foundation exhibits an "S" shape at different excavation stages. (2) The closer the distance between the tunnel and the pile foundation, the greater the disturbance to the pile foundation. As the tunnel depth increases, strain disturbances in the pile foundation decrease while deformation disturbances increase. (3) Based on the single pile disturbance degree theory, the excavation influence range between the tunnel and pile foundation was classified, and corresponding reinforcement measures were proposed for different influence zones.
Abstract：
To investigate the impact on the mechanical effects and deformation of existing pile foundations due to subway tunnel excavation, a combined approach of theoretical analysis and model test was adopted. The study analyzed tunnel excavation-induced soil disturbances, stress characteristics of existing pile foundations, and the interaction between tunnels and piles. The results reveal that: (1) The disturbance deformation region caused by tunnel excavation is primarily concentrated within four times the tunnel diameter on both sides of the tunnel axis. The disturbance degree of the surrounding soil increases as excavation progresses, and the additional bending moment of the pile foundation exhibits an "S" shape at different excavation stages. (2) The closer the distance between the tunnel and the pile foundation, the greater the disturbance to the pile foundation. As the tunnel depth increases, strain disturbances in the pile foundation decrease while deformation disturbances increase. (3) Based on the single pile disturbance degree theory, the excavation influence range between the tunnel and pile foundation was classified, and corresponding reinforcement measures were proposed for different influence zones.
YANG Wendong1 WU Yang1 WANG Zhide1 WU Haigang1,
2 LI Gen1
.Experimental Study on the Influence Zoning on Existing Pile Foundations Induced by Tunnelling[J] MODERN TUNNELLING TECHNOLOGY, 2024,V61(6): 200-208
2024, Vol. 61 