Abstract：Three-dimensional finite element analysis model is established to simulate the effects of tunnel excavation on adjacent underground pipeline. The influences of pavement，pipeline material，buried depth，spacing distance between pipeline and tunnel，and elastic modulus ratio of soil and pipeline on the displacement of underground pipeline is discussed. Then the calculation values are compared with the test values. It shows that the results of finite element numerical simulation are well in accordance with but slightly larger than measured data. Displacement of shallow-buried pipeline decreases and settlement trough width becomes narrow due to the existence of pavement. Horizontal displacement of underground pipeline induced by tunnel excavation is far less than vertical displacement. The maximum horizontal displacement and vertical displacement of pipeline perpendicularly crossing with tunnel change linearly with buried depth of pipelines，and decrease with the increase of elastic modulus ratio of soil and pipeline. Defining L as ratio of distance between axial lines of pipeline and tunnel，and h as buried depth of pipelines，The maximum horizontal displacement and vertical displacement of pipeline parallel with tunnel decrease with the increase of L/h. The maximum horizontal displacement changes linearly with L/h，and the maximum vertical displacement increases quickly when L/h＜10. The maximum stress of pipeline decreases with the increase of L/h，and increases quickly when L/h＜5. The maximum stress of pipeline changes slowly with small value when L/h≥5.
