Deformation Mechanism Analysis of the Pile Wall Supporting of Deep Excavation Based on the Model Test

The model test of the deep excavation under the two-dimensional surface strain condition is conducted,then the pile wall supporting deep pit in the cantilever supporting,single and double supporting forms are simulated.The displacement of the pile wall,the vertical displacement of the superficial soil,and the strain of soils are measured.Finally the insertion ratio λ of the pile wall,the influencing law with or without the support of cross direction and the support position are discussed,which provides some extremely useful reference for the future research.