Abstract
The essential factor that must get the interest by the engineers during the primary design stage of underground pipes is understanding mechanism of damage during earthquakes. The attention during design period increased due to the increment of seismic catastrophes throughout the few past decades. Therefore, finite element procedure was used for studying the seismic performance of buried pipes. PLAXIS-2D program was using for simulating the seismic performance of buried pipes using earthquake motion of single frequency. The response of both seismic vertical displacement, and acceleration of the buried pipe were simulated. The experiments of shaking table for two models of buried pipe in dry case that surrounded with sand and gravel were compared with numerical simulation results. According to the obtained results, the amplification of seismic wave raised considerably from the buried pipe base to the pipe crown, the biggest amplification occurred in the highest point of the pipe model. It can be noticed that Plaxis-2D software provides an accurate method for the prediction of seismic behaviour of buried pipe due to the obvious compatibility between the results of experiments and numerical simulation.
Highlights
Buried pipeline systems, which considered an important part of infrastructure lifeline networks, can be used to transport petroleum, gas, or water
Transient ground movement is induced by influence of wave propagation, whereas landslide, fault movement, and liquefication are the possible failures that are categorised as permanent ground deformation
The results of displacement and acceleration obtained by 1-g shaking table tests are compared with those obtained by PLAXID-2D V8.5 software
Summary
Buried pipeline systems, which considered an important part of infrastructure lifeline networks, can be used to transport petroleum, gas, or water. Forces of compaction [9], supporting of pipe haunch [10,11], height of backfill [11,12,13,14,15], loads of traffic [10,16,17,18,19,20,21], erosion voids [22, 23], nearby excavation [24], and soil saturation [25] all had an impact on the behaviour of underground flexible pipes as a result of these intensive efforts. Previous experiments dealt with the influence of fault displacement only, which means permanent deformation, that induced by earthquake [26,27,28,29], there has not any study reported the response of flexible pipe against transient deformation. Worthy evidences are presented to suggest that occurrence of crashes in a traffic stream is greatly correlated and increased with a higher variation of vehicle speeds
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