沪宁城际铁路基坑开挖对既有线动态影响分析

罗锟; 雷晓燕

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铁道工程学报 ›› 2010, Vol. 27 ›› Issue (9) : 5-8.

路网研究

沪宁城际铁路基坑开挖对既有线动态影响分析

罗锟，雷晓燕

作者信息 +

The Dynamic Analysis of the Existing Railway’s Subgrade Settlement Caused by Excavation Pit on Hu—Ning Line

LUO Kun，LEI Xiao—yan

Author information +

文章历史 +

摘要

研究目的：随着列车运行速度的提高，轨道结构的动力响应将增加，对轨道结构动态几何形位的良好保持提出了更高的要求。本文以既有沪宁线旁沪宁城际铁路桥墩基坑的开挖为例，分析基坑开挖对既有沪宁线路基沉降的动态影响。

研究结论：通过建立车辆一轨道一路基耦合系统动力分析模型和路基一土体一基坑一支护结构耦合系统动力分析模型，分析基坑对路基沉降的影响。结果表明：基坑的开挖深度、开挖后支护方法、列车通过方式均对邻近既有线路路基沉降造成影响。3种不同工况下的竖向动位移范围在0．8—1．6mm，满足规范要求。

Abstract

Research purposes: With the increase of high—speed train’s speed，the dynamic response of track structure will be increased，which requires more about the track geometry．This paper takes the excavation pit on Hu—Ning intercity passenger rail by the side of existing railway line for example to analyze dynamic response of subgrade settlement caused by the excavation pit．

Research conclusions: In order to analyze the subsidence of roadbed caused by excavation of foundation ditch，the numerical model was set up，which is composed of two parts，including the vehicle—track—roadbed—ground coupling system and the roadbed—ground—ditch—supporting structure coupling system．It is shown that the depth．Support Method. and the load will induce the different sedimentation of the roadbed．The vertical dynamic displacement in the three cases is between 0．8 to 1．6 mm．and which come up to the standard．

导出引用

罗锟, 雷晓燕. 沪宁城际铁路基坑开挖对既有线动态影响分析[J]. 铁道工程学报, 2010, 27(9): 5-8

LUO Kun, LEI Xiao—yan. The Dynamic Analysis of the Existing Railway’s Subgrade Settlement Caused by Excavation Pit on Hu—Ning Line[J]. Journal of Railway Engineering Society, 2010, 27(9): 5-8

中图分类号： U211．2

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