Theoretical Analysis on the Effect of Tunnel Excavation on Building strip foundation

2017 2nd International Seminar on Advances in Materials Science and Engineering

Tian, Xiaoyan^1,2 ; Gu, Shuancheng^1 ; Huang, Rongbin^1

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

710054, China^1

Civil Engineering Department, School of Mechanical Engineering, Xi'An Shiyou University, Xi'an

710065, China^2

关键词: Differential characteristic;    Equilibrium conditions;    Homogeneous equations;    Material mechanics;    Relative positions;    Synergistic effect;    Theoretical calculations;    Trigonometric functions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/231/1/012088/pdf
DOI  :  10.1088/1757-899X/231/1/012088

来源: IOP

【 摘 要 】

In this paper, according to the characteristics of the ground settlement troughs curves, the influence of tunnel excavation on the effect of strip foundation was studied by inverse analysis firstly. The differential equation of the synergistic effect of the strip foundation and foundation under the tunnel excavation was established by using the equilibrium condition of the micro-element physical force. Then, the conceptual definite initial parameter method was used to solve the corresponding homogeneous equation. According to the plane section assumption, combined with the basic theory of material mechanics, considering the differential characteristic of hyperbolic trigonometric function, and using matlabmathmatica software, the theoretical calculation expression of displacement and internal force which is about the tunnel passes through the strip foundation was obtained. Finally, combined with engineering case analysis, changes of the relative position between the tunnel and the foundation, the influences of the main parameters on the foundation effect were studied. The results show that: The influence scope of the tunnel on the foundation is [-0.5 ∼ 1.5] times of the foundation length, and when the tunnel center at the end of the foundation, there exists the maximum settlement. The parameters about the soil loss rate, the excavation section and the buried depth of the tunnel have great influence on the foundation effect. The change of foundation height has a great influence on its internal force.