Stability Of The Foundation Pit Structure Close To The Subway Station Railway

The Minzhi station of Shenzhen subway is close to the railway and there has bias load, the effects of the foundation stability induced by the bias load and the train dynamic load can not be ignored. The current relevant regulations did not provide details of bias foundation design and construction under the effects of train dynamic load. So, it has important practical significance to carry out a study towards the internal force and deformation when the bias foundation being excavated and can provide an experience to similar projects.In this paper, by using the comprehensive survey, field testing, theory and numerical analysis in a comprehensive way, the stability of retaining structure of the bias foundation under the train loads was studied, the main research contents:(1) By analyzing the internal force, deformation and stability of the retaining structure of the bias Foundation, the characteristics of internal force and deformation in retaining structure were obtained.(2) The force of retaining structure, surface and ground movement situation were studied by using numerical analysis method, the stability of the retaining structure under the train loads were analyzed by using the models of the static load from equivalent soil column.(3) Based on the field measurement of internal force and deformati-on on the foundation retaining structure, numerical simulation method was used to analyze at situations of different bias high of soil column and support measures, to evaluate the design parameters of the foundation retaining structure.(4) The size and regularity of train loads was obtained by field test, the effects of train dynamic load acting on the retaining structure was analyzed by using numerical simulation method.(5) Based on the comprehensive method above, the movement and load models for the bias foundation near the railway was proposed, and the design and construction methods were discussed.