Research purposes: With the spread of high-speed railway (HSR) operation，the impact of urban upgrading and expansion to operating high-speed railway gradually appears. Especially in southern and eastern China， which is more developed area, newly-built roads，channels，urban railway transit and some other projects face to cross HSR or parallel with it at very close spacing. Study on safety impacts of these projects to HSR has become a significant issue to engineers and technicians. This paper mainly studies on safety analysis of the effect of a newly-built channel of Xingou River on bridges of Shanghai-Nanjing Intercity by finite element quantitative analysis，specializes on riverbed evacuation，embankment loading and additional effect of isolated piles construction on HSR bridge. Besides，methods of safety construction and active protection are given.
Research conclusions:(1)At the condition of control relevant physical parameters of excavation and piling, measures of isolation to protection if necessary，channel excavation and piling can be done with HSR at normal operating speed. (2)Numerical analysis of newly-built channel paralleled with Shanghai-Nanjing Intercity shows that the main impact of the additional lateral deformation of the piers on additional settlement of pier is very small.(3)Stress releasing caused by isolated pile drilling, together with unfavorable effects caused by channel excavation，leads to adverse additional deformation of HSR bridge pier.(4)To reduce the additional lateral deformation of HSR bridge pier, increasing the length，instead of stiffness of the isolation pile is effective，especially at good bearing layer.(5)The research results have the reference value in safety evaluation of HSR bridge disturbed by large volumes soil engineering nearby.
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