Design And Study On Deformation Controlling Of Retaining Structure In Deep Foundation Pit

This paper discusses the basic principle and method of the design of the retaining structure with account into deformation controlling by analyzing the relationship between horizontal displacement, vertical subsidence, and basement uplift, by studying the mechanism of the deformation on retaining structure and the influencing factors. The author also provides a method for predicting the displacement of retaining structures by means of neural network.The emphasis is given on the studying of the horizontal displacement on the retaining structure consist of piles and anchors, which is a frequent type of retaining structure. It is founded that the rigidity of anchors and magnitude of pre-stress are the main factors which influence the deformation of retaining structures.The optimal design method on pile-anchor systems is presented. The method proposed regards the requirement of deformation as the first constraint condition. It has improved the conventional optimal design methods by simplifying the variables and the optimal program. It considers the bending moment as the main objective function, while the conventional methods regard the construction cost as the objective function.A model has been applied to the prediction of the deformation of pile-anchor systems by using MATLAB toolbox. It has been conducted in a deep foundation pit project. The result shows that it compares well with those data from practical measure, though it has still some shortcomings such as instability.The effect of vibration is presented by performing back analysis. Discussions on the environmental effect due to deep excavation are also included in this paper.