Research On Deformation And Prediction Of Retaining Structure For Deep Excavation In Sea Reclamation Area Of Subway Station

With the rapid development of the coastal city of social and economic, the great demand of land and the traffic jams and congestion are more and more prominent. Adopt the method of sea reclamation to solve tension and build the subways to alleviate the pressure of the ground transportation has become generally effective measures in coastal city development strategy.Reclamation special geological and environmental conditions area, making the deep excavation deformation of retaining structuresand different with other deep excavation in soft soil area. This paper is based on deep excavation deformation research achievements at home and abroad in recent years, relying on Dalian Haizhiyun subway station deep excavation engineering, by theoretical analysis,field monitoring,numerical simulation and other integrated methods in sea-filling region to study the law of deep excavation deformation of retaining structures. Applying the least squares support vector machine (LS-SVM) based on the MATLAB theory to predict the deformation of deep excavation deformation of retaining structures, some valuable conclusions are drawn.The main research results includes:(1) The deep excavation of Dalian Haizhiyun subway station has carried on the field monitoring, the analysis of field monitoring data, get the change law of displacement of retaining pile and steel support axial force change rule. The results show that the deep excavation deformation of retaining structures has obvious time-space effect, Timely installation of the steel support and accelerate the construction speed can effectively control deep excavation. Elasticity deformation cause the pile happen to migrate toward the outside.(2) The three-dimensional finite element model of the Haizhiyun subway station deep excavation is established,retaining structure deformation is simulation, and the simulation results with the measured data are analyzed. The results show that numerical simulation of the horizontal displacement curve and the measured displacement curve are almost the same income level, many factors influence the deformation of retaining structure in the process of site construction, curves exist certain differences. Analyzed the different pile length on the horizontal displacement of the retaining structure, The results show that the embedding rock is smaller, the greater the rock depth. But when the embedding rock depth reaches a certain, effect will decrease.(3) Based on the MATLAB toolbox, adopt least squares support vector mechanism theory to predict the deep excavation retaining structure horizontal displacement analysis. The results show that adopt the least squares vector machine can be carried out on the horizontal displacement of retaining structures higher prediction accuracy, at the same time, the deep excavation horizontal displacement of retaining structure is the future trend, So as to achieve purpose of retaining structure early prediction and control.