Research on Deformation Mechanism and Control Technology of Large Diameter Steel Corrugated Pipe Culvert on High Fill Subgrade
In order to solve the problem of excessive deformation of traditional high fill large diameter steel corrugated pipe culvert construction.Firstly,based on the formula of the pipe compression deformation,proposed a new technology of filling the cement soil material within a certain range on both sides of the pipe culvert.Secondly,the optimum cement mass fraction in the cement soil material was determined by laboratory tests;Finally,based on numerical simulation and field tests,analyzed the force and deformation characteristics of the pipe culvert structure constructed with the new technology and its upper vertical soil pressure distribution law,and determined the optimal pipe side filling range.The results show that the new filling technology can make full use of the stiffness of cement soil to limit the deformation of the pipe culvert.The maximum vertical and horizontal deformations of the pipe culvert are reduced by 35.1％and 55.0％,respectively,when cement soil with a mass fraction of 8％ cement is used for backfilling within 2/3 of the pipe diameter on both sides of the culvert.Also,the maximum stress is transferred from the top of the pipe to the upper 45 ° of the pipe culvert,and the stress of the pipe culvert is more reasonable.The new filling technology makes the pipe culvert better coordinate with the surrounding soil,generating load redistribution to form the soil arch effect.The soil pressure on the top of the pipe is transferred from the center of the pipe to the edge,which effectively reduces the structural deformation and stress concentration of the steel corrugated pipe culvert.
high fill subgradelarge diameter steel corrugated pipe culvertfilling constructiondesign parameters optimizationdeformation control
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