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中文摘要：
结合沪宁城际铁路建设项目进行数值计算研究,通过分析不同施工阶段对紧邻运营铁路产生的影响,确定基坑开挖为路基最危险阶段;以最危险阶段为模型,计算得到列车通过速度以及停靠对开挖路基影响不大,路基状态主要受基坑开挖深度影响,而雨水浸泡则会导致路基强度与变形发生较大变化甚至失稳,必须加强雨后对路基的防护;计算得到的极限破坏状态变形、动力响应等参量阈值可作为路基状态评价的标准.
英文摘要：
The research of numerical calculation was conducted, combining with the Shanghai - Nanjing intercity railway construction project. This paper analyzed the influence of different construction stages on adjacent operating railway, and determined that foundation pit excavation was the most dangerous period for roadbed stability; Taking the most dangerous stage as a model, the calculation results show the train speed and stop cause no big impact on the roadbed excavation, while the state of subgrade is mainly influenced by excavation depth, and the rain soak would result in substantial change for the subgrade strength and deformation or even lead to instability, thus strengthening the subgrade protection after the rain is a must. The threshold values, such as the deformation and dynamic response calculated under limit failure state, can be regarded as the standard for evaluation of subgrade state.
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