Contact Model Study On Prefabricated Large Diameter Reinforced Concrete Culvert

Combined with the subject that approved by Anhui Provincial Communications department and Anhui Traffic Investment Group's research project , this paper uses theoretic analysis and numerical stimulation to do a deep systematic research on the mechanical properties, the measures and materials for reducing vertical soil pressures acting on Concrete Culvert, structural optimization, The main research work containing some aspects are as following:(1)Considering interaction of filled soil,the prefabricated reinforced concrete culvert and foundation, with an eye to non-linear soil model,in view of the initial geo-stress field and the effects of interface between soil and the prefabricated reinforced concrete culvert, and by finite element method the calculation model and method are built for transverse stress in the prefabricated reinforced concrete culvert.(2)A three dimensional solid contact calculation model of the culvert is established to calculate the size and the distribution of its stress. Comparing with the results calculated by the two-dimensional finite element and the result of three dimensional, it shows that the two results are nearly the same.(3) Based on the research of a prefabricated reinforced concrete culvert of Anhui Ming(guang) Xu (zhou) expressway and considered the principle of soil-struction interaction and the friction and extrusion between segment joints, this paper discusses and studies the key issues relating to the location of splitting point of segment joint and the bad position for the location of loaded vehicles by using finite element numerical simulation technology to establish a two-dimensional finite element model for the culvet.(4) A space finite element model of skew prefabricated reinforced concrete culvert is established. Skew prefabricated reinforced concrete culvert loaded under the vehicles, the deformation size of different skew culvert and the stress size and the distribution of stress have been analyzed in this paper.(5) On the basis of above mechanical analyses, the measures and materials for reducing vertical soil pressures acting on the prefabricated reinforced concrete culvert are discussed, and then the calculation model set up in this paper being applied in Liu(an)Wu(han) expressway of the prefabricated reinforced concrete culvert flexible filled materials, Using the model to analyze the deformation and stress distribution of a prefabricated culvert of Liu(an)Wu(han) expressway and comparing the calculation results and field measurement record, this paper verifies the accurate and feasibility of the model and result.