深厚软土区新建市域铁路路基对邻近既有高速铁路路基的变形影响分析
李振华1王长丹2
Analysis of Deformation Impact of Newly Constructed City Railway Subgrade on Adjacent Existing High-speed Railway Subgrade in Deep Soft Soil Areas
LI Zhenhua1WANG Changdan2
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作者信息:1.中铁华铁工程设计集团有限公司, 100071, 北京
2.同济大学交通学院， 201804， 上海
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Affiliation:1.China Railway Huatie Engineering Design Group Co., Ltd., 100071, Beijing, China
2.College of Transportation, Tongji University, 201804, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20250233
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中图分类号/CLCN:U213.1
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栏目/Col:土建工程
摘要:
［目的］为有效评估深厚软土区新建市域铁路路基对既有铁路路基服役性能的影响，需对新建市域铁路路基施工过程中的竖向变形，以及邻近既有高速铁路路基的水平位移规律进行研究。［方法］通过现场监测与数值计算方法相结合，分析了新建市域铁路路基不同填筑阶段的竖向变形，以及其对邻近既有高速铁路路基水平位移的影响规律。［结果及结论］新建市域铁路路基填筑过程中，其竖向变形经历了平缓阶段、逐渐累积阶段、显著变形阶段及趋于稳定阶段。填筑初期阶段地基沉降较小，随着堆载的逐步增加，地基土沉降量呈现加速发展趋势，最终趋于稳定。邻近地层的水平位移随着填筑高度的增加而逐步增大，随着填筑高度的增加，堆载效应更加显著。新建市域铁路路基的填筑对邻近地层的沉降与水平位移有一定影响，但相较于新建路基本身的沉降量影响较小。数值模拟结果与现场监测结果的吻合度较高，验证了数值模型的准确性。
Abstracts:
［Objective］ To effectively evaluate the impact of newly constructed city railway subgrade on the service performance of existing railway subgrade in deep soft soil areas, it is essential to study the vertical deformation of the new subgrade during construction and the horizontal displacement pattern of the adjacent existing high-speed railway subgrade. ［Method］ By combining field monitoring with numerical calculation methods, the vertical deformation of the newly constructed city railway subgrade at different filling stages and its influence on the horizontal displacement of the adjacent existing high-speed railway subgrade are analyzed. ［Result & Conclusion］ During the filling process of the newly constructed city railway subgrade, the vertical deformation undergoes four distinct phases: the gentle stage, the gradual accumulation stage, the significant deformation stage, and the stabilization stage. In the initial filling phase, the subgrade settlement is relatively small; as the load gradually increases, the settlement of foundation soil accelerates, eventually tending to stabilize. The horizontal displacement of the adjacent strata increases progressively with the increase in filling height, and the load effect becomes more pronounced as the filling height rises. The filling of the newly constructed suburban railway subgrade has certain impact on the settlement and horizontal displacement of the adjacent strata, but the impact is relatively minor compared to the settlement of the new constructed subgrade itself. The numerical simulation results are highly consistent with the field monitoring results, confirming the accuracy of the numerical model.
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