Analysis of Influence of Curtain-box Culvert Jacking on Surface Deformation
Under the condition of the rapid development of urban traffic,the large section shallow buried underpass has been increasing day by day,the use of tube curtain box culvert construction has a unique advantage.In this paper,a curtain box culvert project is taken as the background,key monitoring sections are selected based on the jacking thrust calculation results,and a finite element model is established for key construction nodes to simulate the existing jacking scheme and analyze the surface settlement deformation caused by the jacking of curtain box culverts.Based on the sensitivity analysis of the parameters with large dispersion in the modified Cambridge model,the parameters with large influence on soil deformation are obtained as the parameters to be inverted.25 groups of orthogonal test soil parameters were designed and substituted into a two-dimensional model to construct the training data.According to the surface settlement monitoring data,soil parameters under five working conditions were obtained by using ISA-ELM network model inversion,and then recalculated into the finite element model to achieve deformation prediction under subsequent working conditions.The results show that the calculation method proposed in this paper is in line with the actual law of the project,and has a good reference value for similar projects;the locations of the maximum settlement and maximum value obtained by the proposed parameter inversion and deformation prediction method based on intelligent algorithm are closer to the monitoring value than the initial parameter value,which indicates that the parameter inversion has practical significance and value of use.
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