Experimental and Numerical Analysis of Internal Forces and Deformation During Reverse Construction of Deep Foundation Underground Structures
In order to study the internal force and deformation laws during the reverse construction process of underground structures,on-site tests of the underground composite structures of deep foundation pit during the construction period were carried out,and the nonlinear structural responses of different internal and external constraints and the effects of reverse construction were analyzed by combining refined numerical models.Firstly,on-site experiments and tests were conducted on the underground composite structure of a deep foundation pit under construction,and the development processes of stress-strain changes of typical components of the structure were measured and analyzed.Secondly,a refined finite element model was developed,and the internal force and deformation laws of the underground concrete-filled steel tube composite structure under deep excavation during the construction period were studied through parameter analysis.The research results indicate that due to the influence of surrounding soil,the overall horizontal deformation of the underground structure is large at the end and small in the middle;in the depth direction,the horizontal displacement of the middle layer is greater than that of the first and bottom layers;the axial pressure on the end components of the structure is greater than that on the middle components;underground structures are less prone to cracking during reverse construction compared to aboveground structures.
deep foundation pitreverse constructioncomposite structureconstraintsshrinkage creep
NETL
NSTL
万方数据
