Numerical Simulation And Centrifuge Model Test On Interaction Between Buried Pipeline And Soil Due To Tunneling

ABSTRACT:The use of urban underground pipeline is an important basis on exerting urban function, ensuring socio-economic and urban development. In recent years, the city’s water and electricity, road zippers and other problems caused by Urban buried pipeline have seriously affected the normal life of residents, while the new tunnel excavation would inevitably have negative impact on buried pipelines. The deformation and failure of existing pipelines caused by new tunnel excavation have become more and more serious, and it is particularly important to find a reasonable methodology to estimate the safety of buried pipelines for reducing the risk of existing pipelines’failure.The finished is followed:(1)The separation between existing pipelines and surrounding soils during the excavation of tunnels has been considered in this paper. On the basis of elastic numerical calculations considering the cohesive force and internal friction angle of soil, the plastic finite element model is founded and numerical analysis is carried out then, and after which the results of elastic calculation and plastic calculation with the theory results will be compared for coincide with theory calculation model.(2)Then, the scheme of centrifugal model test will be carried out on the basis of tunnel excavation’s effect on medium pipelines. The pipeline’s settlement, free-field soil’s settlement and the internal force of pipelines during tunnel excavation are measured in the test. And tunnel excavation’s effect on deformation of existing pipelines in the medium pipelines model will be analyzed according to the test result.The conclusion is followed:(1)There are same criterions in flexible pipelines, medium pipelines and rigid pipelines to elastic calculation.(2) Compared with test result, the numerical and theoretical results can reflect the test data which is true with the theory model.