新开河道并行沪宁城际高铁安全影响分析  

Analysis of Safety Impact on Newly- built Channel Paralleled with Shanghai-Nanjing Intercity High- speed Railway

作　　者：冯印[1] 

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道工程学报》2014年第8期37-43,共7页Journal of Railway Engineering Society

摘　　要：研究目的:随着高铁投入运营范围逐步扩大,城市升级扩容对正在运营的高铁的影响正在逐渐凸现,尤其是我国较发达的东、南部地区,新建道路、河道疏浚、城市轨道交通等工程的建设已无法避免与高铁交叉或近距离并行,研究此类工程对高铁的安全影响已成为工程技术人员需要解决的问题。本文针对新沟河新开河道对沪宁城际高铁桥梁的安全影响通过有限元定量数值分析,主要研究河槽开挖、河堤堆载以及安全防护隔离桩施工作业对高铁桥梁的附加影响,提出安全施工的要求及主动防护隔离措施。研究结论:(1)控制开挖及堆砌土体相关物理参数,必要时采取隔离主动保护措施,可在高铁正常运营速度情况下进行河道开槽及堆砌施工;(2)新开河道并行沪宁城际高铁,数值分析表明主要影响在桥墩附加横向变形,对桥墩附加沉降的影响极小;(3)隔离桩钻孔施工引起的应力释放与河道开挖引起的不利影响形成同向叠加,使得高铁桥墩附加变形结果更趋不利;(4)减小高铁桥墩附加水平向变形,通过增加隔离桩刚度不如增加隔离桩桩长效果明显,尤其是隔离桩持力层较好时;(5)该研究成果对于在高铁桥梁附近进行大体量土体扰动的安全评估方面具有参考价值。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 adverseadditional 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.

关 键 词：高铁 沪宁城际 附加变形 新开河道 隔离桩 安全影响 

分 类 号：U24[交通运输工程—道路与铁道工程]