Abstract: A coupled numerical model is established by adopting the u-p model. The dynamic response of pipe jacking in saturated soil under surface explosion is investigated in detail. A comprehensive parametric study is carried out to study effect of explosive charge, explosion offset, embedment depth and radius of the pipe jacking. The results show that the vertical displacement of pipe jacking increases with explosive charge. The stability capacity of the pipe jacking under surface explosion decreases as the pipe radius increases. Increasing the buried depth of pipe jacking can significantly enhance the anti-explosion ability of pipe jacking under surface explosion. In additioin, the vertical displacment of the pipe jacking decreases as the off-set distance increases. The pipe jacking rises slightly under surface explosion eventually. And the horizontal displacement increases firstly and then decreases as off-set distance increases.

Key words: pipe jacking; surface explosion; saturated soil; displacement response