Research On Optimal Design Of Complex Deep Foundation Pit Support Based On BIM Technology

With BIM technology is widely used in construction industry,foundation pit engineering as an important area of the construction industry,because of the traditional two-dimensional foundation pit supporting design cannot articulate supporting structure space to the whole cross section calculation of foundation pit can't consider dangerous surface to carry on the design of foundation pit,plus the concealment of the underground space and the complexity of the foundation pit supporting structure,the introduction of BIM technology makes up for the traditional two-dimensional foundation pit supporting design can meet the key technologies in the foundation pit supporting the overall design.This paper presents an example of a deep foundation pit engineering in changchun area,the introduction of BIM technology,the problems existing in the traditional design of foundation pit supporting of deep foundation pit Yang Angle of anchor cable for the optimal design of Angle position,and through external Angle before and after optimization design scheme of the finite element analysis optimization of pile anchor system under different working condition of the excavation of the rule of variation of axial force and displacement,for changchun and similar areas in the design and construction of deep foundation pit engineering related problems to provide the reference in this paper,the main research contents and conclusions are as follows:(1)The advantages and disadvantages of the current foundation pit design software are analyzed deeply.The introduction of the 3D foundation pit design model can avoid or reduce the collision defects of the 2d design junction and the local anchor cable at the Yang Angle.The technical key of BIM technology and foundation pit modeling is analyzed through Revit software combined with practical engineering examples.Navisworks software was used to check and analyze the collision of the Yang Angle anchor cable in Revit 3D foundation pit model.A total of 114 collisions were found through quantitative analysis.The collision of the Yang Angle anchor cable was avoided by adjusting the elevation Angle of the anchor cable;(2)Using finite element software Midas GTS NX to support the foundation pit design before and after optimization design scheme of the numerical simulation analysis,discusses the mesh constitutive model and constraint boundary conditions,numerical simulation results on foundation pit Yang Angle of anchor pile anchor support after optimized the maximum horizontal displacement of pile is about 85% of the maximumhorizontal displacement of pile before optimization.The maximum settlement value of surrounding surface settlement is about 86.15% of the maximum settlement value before optimization.The maximum axial force of anchor cable is about 82.82% of the maximum axial force of anchor cable before optimization.(3)Aiming at the coupling analysis of the group anchors at the positive corner of three-dimensional foundation pit,Navisworks software was used to analyze the collision inspection of the positive corner anchors.Quantitative optimization could avoid the safety problems caused by the failure of the support structure in the construction process.