Dynamic Response Of Buried Steel Pipe Subjected To Blast Loads

With the continuous development of urbanization in China,underground pipelines such as oil transmission,gas transmission,cable,communication,and water transportation have been closely linked with people’s lives,and at the same time,the large underground pipe network has brought more and more intersection with the construction areas such as urbanization and blasting project.The harmful effects of blasting have become one of the important safety hazards in the surrounding underground pipe network,especially the blasting vibration effect is more likely to directly affect the normal work of underground pipe network.Therefore,the dynamic response of buried pipeline subjected to blast loads is one of the urgent problems in urban blasting construction,which has important theoretical and practical significance.In this paper,the three-dimensional finite element model of explosives,buried steel pipes,and clay media was established by LS-DYNA to simulate and calculate the dynamic response laws of buried steel pipes under different explosive quantity,different distance to explosive’ s center.Studies have shown that,the peak value of strain and the peak value of vibration velocity of the central unit of the buried steel pipeline are increased with the increase of the explosive dose,and decreases with the increase of the blasting center distance.Therefore,the distance and the amount of medicine should be controlled reasonably in the vicinity of the pipeline,The explosive quantity can be controlled by the method of differential blasting.This paper is supported by the research on dynamic response and its failure mechanism of buried pipeline subjected to blast loads.On the basis of theoretical analysis and numerical simulation,aiming at the three influencing factors of explosive quantity,distance to explosive’ s center,and explosive source depth,we designed the experimental plan with control variable method,and carried out field experiments on three kinds of seamless steel tubes.According to the analysis of field experiment data:(1)The pipe strain and vibration velocity peaks increase with the increase of the explosive quantity and decrease with the increase of the distance to explosive’ s center;(2)The vibration velocity in each direction of the pipe particle is influenced by the propagation direction of the seismic wave;(3)The calculation formulas of strain peak value,distance to explosive’ s center and explosive quantity under experimentalconditions are obtained,which can provide reference for similar research.