Excavation Construction’s Influence On Existing Bridge Based On ABAQUS

With the increasing construction of high-speed railway, more and more high-speed railway was put into operation. High-speed rail has become the primary choice of transport because of comfortably and high speed of high-speed rail. Because of this, its security of high-speed rail is very important. Currently, the bridge accounted for a considerable share of the line in the high-speed railway which has been opened. So construction engineering near the high-speed railway bridge is the problem that must be considered. The excavation will inevitably have an impact on the existing high-speed railway bridges. Excavation will cause soil displacement and will produce a lot of adverse effects on high-speed railway girder bridge’ group pile. First, the vertical displacement of the soil will cause vertical displacement of the pile thereby causing a vertical displacement of the deck; Secondly, the horizontal displacement of soil leads to pile deformation, thereby causing the bridge deck horizontal displacement. Finally, piers and piles connect through caps and the upper structure. Then complex effect will produce in bridge and deformation is more difficult to estimate.Combined with engineering practice, excavation near the high-speed railway bridge was simulated by finite element software ABAQUS, and he depth direction of the horizontal displacement, pier top horizontal displacement and vertical displacement will be analyzed. Secondly, due to the complex three-dimensional analyze the modeling process, higher hardware configuration requirements and longer computing time, this paper presents a simplified two-dimensional finite element method, and were elastoplastic analysis. The results of three-dimensional model and two-dimensional model analysis will be analyzed and compared. Then the different cases will be analyzed and compared. For comparison, the two-dimensional method can be used to simplify the numerical analysis of the actual project. Then the excavation of each condition factors were analyzed by two-dimensional finite element model, separately analyze different excavation depth, width and pile distance excavation pit with the existing bridge on Bridge generated pier in the depth direction of the horizontal displacement, affecting pier top horizontal displacement and vertical displacement. Finally, the impact of excavation on the existing bridge about reinforcement measures will be analyzed two-dimensional finite element simulation. Each reinforcement measures generated operating conditions existing bridge piles, piers along the depth direction of the horizontal displacement, pier top horizontal displacement and vertical displacement will be analyzed.Through the three-dimensional finite element modeling and two-dimensional finite element modeling simulation comparison, calculation methods guidance can be provided for similar projects; Through the analysis of various factors, and comparison of the various conditions of reinforcement measures, meaningful guidance for determining the actual construction scheme can be provided.