Mechanical analysis about the influence of tunnel excavation on vertical effect of adjacent bridge pile

2nd International Conference on Materials Science, Energy Technology and Environmental Engineering

材料科学;能源学;生态环境科学

Tian, Xiaoyan^1

School of Architecture and Civil Engineering, Xi'An University of Science and Technology, Xi'an, China^1

关键词: Adjacent bridge piles;    Equilibrium conditions;    Friction resistance;    Mechanical analysis;    Polynomial fittings;    Three-dimensional numerical simulations;    Vertical displacements;    Winkler foundation models;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/81/1/012114/pdf
DOI  :  10.1088/1755-1315/81/1/012114

来源: IOP

【 摘 要 】

Tunnel excavation will bring additional deformation and internal force of adjacent bridge piles, if the deformation is large, it will threat the upper structure safety of the bridge. According to the complexity of the existing three - dimensional numerical simulation modeling and the time - consuming calculation, a two - stage analysis method of tunnel excavation based on Winkler foundation model was proposed. Firstly, Loganathan and Polous solutions were used to obtain the vertical displacement of the soil free field at the pile position when tunnel excavated, and the corresponding polynomial fitting displacement curve was taken. Secondly, the differential equation was established by means of the equilibrium condition of micro - element physical force and considering the pile group effect. Then, through the logical derivation, the calculation expressions of the tunnel excavation on the effect of the adjacent bridge pile (settlement, axial force and friction resistance) were obtained. Finally, based on the background of the tunnel project of Yanxing Door Station ∼ Xianning Road Station in Xi'an Metro Line 3, the feasibility and applicability of the proposed method were proved by comparing the calculated values with the numerical simulation values. It provides theoretical guidance for the effective analysis about the influence of tunnel excavation on the adjacent pile foundation effect.