路基工程下穿既有桥梁或高架渡槽时，其增加的荷载及施工开挖必然会引起桥墩周围土体受力状态发生变化，可能会给既有上跨结构物带来很大的不安全隐患，因此必须根据不同的工程环境条件，通过对边坡进行稳定性分析及施工安全评价，制定合理的工程方案，以保证既有上跨结构物工程的安全运营。以多处铁路下穿工程为背景，总结并分析了下穿既有上跨建筑物的两种方案的适用条件，并对边坡稳定性分析方法予以阐述，最后提出了下穿工程施工注意事项，可为其他类似工程提供借鉴。%Subgrade engineering passing below the existing bridges or elevated aqueducts will generate additional load,it is bound to cause the soils’stress change surrounding the bridge pier during the construction,and it will possibly bring large uncertainties or safety concerns of the construction.As a result,we must formulate suitable engineering plans according to different engineering conditions and through the study of the stability analysis of slope and the evaluation of the construction safety to ensure the safety operations of the existing overpassing structure.Based on the engineering background of several railway engineerings,the article summarizes two plans of engineering underpassing the existing structure and analyzes their application conditions,it also introduces the analysis method of the slope stability.Construction points for attention are put forward at the end of the article,it could be a reference for other similar engineering.
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