Theory Research On Low-Fill Prefabricated Reinforced Concrete Tubular Channel

Research of Mechanical characteristics and stress mechanism on Low-FillPrefabricated Reinforced Concrete Tubular Channel involved in undergroundengineering, structural engineering, geotechnical engineering and structuralmechanics, elastic-plastic mechanics, soil mechanics, and other disciplines.It isa multidisciplinary cross research subject. Due to the project involved contentis quite widespread, the influence factors are complex, only with the theoreticalanalysis method is very difficult.This paper combined with traffic investment group in anhui provinceresearch project 《fabricated reinforced concrete culverts/channel seriestechnology research and engineering application》 issue, and with thetheoretical analysis and numerical simulation analysis and calculation methodof combining, To fabricated reinforced concrete pipe type channel and themechanical properties of the stress mechanism of the system and thoroughstudy,The main research contents are as follows:(1) The three dimensional calculation model on fabricated reinforced concretepipe type channel tubes of the interaction：Previously, soil and structure of between about extrusion and friction isthrough the soil spring unit to consider. And now, with the development ofcomputer numerical simulation technology, Ansys3D surface-surface contactunit can reflect the soil and between the structure extrusion and friction. Thispaper using3D aspects contact method was established in different wallthickness, different load conditions fabricated reinforced concrete pipe typechannel tubes of interaction between soil calculation model, analyzes somefabricated tube type channels of the construction process deformation andstress distribution.(2)Fabricated reinforced concrete pipe stress performance of internal force ofthe structure：In fabricated reinforced concrete pipe structure design, the usual theory isto assume that the top soil pressure pipe diameter vertical in a uniform distribution scope, use structural mechanics method force calculation. Butbecause the pipeline buried belongs to buy structures, want to consider the soiland the structure of the interaction, difficult to indoor laboratory simulationpipeline actual complex stress. Often use at home and abroad "three points"loading of the evaluation of the circular pipe indirect bearing performance.This paper studies the soil around the pipeline and pipeline structure of theinteraction law, of the pipes to the structure of internal force analysis,optimization design for structure provides the technical support.(3)Fabricated reinforced concrete pipe type channel construction processsimulation analysis：The existing highway construction of the tunnels used for cover platestructure of han, box culverts. This kind of structure of the faults are: thesidewalls of the culvert, bend, pressure is cut composite force component, wallmost wider, cause culverts basis and wall body want to consume a lot ofconcrete and steel, no economy; Vulnerable to geographical environment, rawmaterials and other conditions, the beautiful and affected the project quality;Construction time long, restrict the progress of the projects. This articlethrough to the fabricated reinforced concrete pipe type channel widely anddeeply2d finite element analysis model, this paper analyzes the fabricatedreinforced concrete pipe type channel mechanical characteristics, used for usein a practical project was accepted.(4)Fabricated reinforced concrete pipe type channels and soil interaction effectanalysis：Contact problem exist widely in civil engineering structure, fabricatedreinforced concrete pipe type channel and surrounding soils are also toucheach other between each other. Both of the contact analysis, and calculating thestress and strain, and help more accurate knowledge of tube type in thedynamic characteristics of the soil channel and the load stress response.