| 深厚压缩层地基条件下既有高铁路基帮宽变形特性分析 |
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| 引用本文： | 周川滨,李宁,叶丹.深厚压缩层地基条件下既有高铁路基帮宽变形特性分析[J].路基工程,2021,0(6):81-87. |
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| 作者姓名： | 周川滨 李宁 叶丹 |
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| 作者单位： | 中铁二院工程集团有限责任公司，成都 610031 |
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| 基金项目： | 铁总科技研究开发计划项目（2017G008-I） |
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| 摘 要： | 为探究深厚压缩层地基上进行既有高速铁路无砟轨道路基帮宽面技术问题，结合某既有高速铁路路基帮宽实际工程，开展理论与数值计算分析。研究了帮宽荷载传递规律及附加应力分布及发展规律，通过合理选取数值计算参数进行了无砟轨道路基帮宽变形数值计算，并结合现场实测沉降数据分析，得到了帮填荷载作用下既有路基附加沉降分布规律。提出了以帮填宽高比作为帮宽设计控制参数。分析表明:帮填宽高比超过3.0以后，应加强帮宽部分地基处理。
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| 关 键 词： | 高速铁路 深厚压缩层 路基帮宽 荷载传递 变形特性 |
| 收稿时间： | 2021-10-08 |
Analysis on Deformation Characteristics of Existing High-speed Railway Widened Subgrade with Deep Compressible Foundation |
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| Abstract: | In order to explore technical challenges to widen subgrade of existing high-speed railway ballastless track on the foundation of deep compressible layer, theoretical and numerical calculation analysis were carried out based on the practical project of subgrade widening of an existing high-speed railway. The transfer law of side load and the distribution and development law of additional stress have been studied. The numerical calculation of side width deformation of ballastless track subgrade has been carried out by proper selection of numerical calculation parameters, and the distribution law of additional settlement of existing subgrade under the action of side fill has been obtained by combining with the analysis of on-site measured settlement data. The width-height ratio of the widened part has been proposed as the control parameter for the design of subgrade widening. The analysis result shows that the foundation treatment of the widened part should be strengthened when the width-height ratio exceeds 3.0. |
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