DOI: 10.3724/SP.J.1249.2019.01052

Journal of Shenzhen University Science and Engineering (深圳大学学报理工版) 2019/36:1 PP.52-60

Performance of bearing capacity and analysis of design parameters of buried pipelines with geogrid protection

In order to study the effect of parameters related with geogrid and surrounding soil of pipes on the performance of buried pipes reinforced by geogrids, the comprehensive analysis based on finite element method is carried out to investigate the effect of internal frictional angle of soil, embedment depths of geogrids, the buried depth of pipes, and width of loading plate on mechanical and deformation performances of the pipeline. The numerical results show that the ultimate bearing capacity of buried pipes increases remarkably with the increase of internal frictional angle. Optimum reinforcement effect can be obtained when buried depth equals to one fifth of the width of loading plate. Increasing buried depth of pipe can promote the ultimate bearing capacity evidently and alleviate deformation of pipes. Failure mode of buried pipes will change from deformation failure of pipe to foundation failure with the decrease of width of loading plate, and the ultimate bearing capacity will decrease. The effect of grid reinforcement is closely related to the change of the ultimate deformation of buried pipes. The ratio of ultimate bearing capacity of pipeline with grid reinforcement to that of pipeline without reinforcement decreases with the increase of frictional angle and buried depth and increases first and then decreases with increase of loading width.

Key words:geotechnical engineering,buried pipes,geogrid,ultimate bearing capacity,failure mode,static loading,numerical simulation

ReleaseDate:2019-01-28 09:56:34

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