有轨电车不同跨度一体化复合桩板结构路基沉降控制离心模型试验与验证
黄爱军1王长丹2秦晓光1姚青3许浩然2
Centrifugal Model Test and Verification of Settlement Control for Tram Integrated Composite Pileslab Structure Subgrade with Different Spans
HUANG AijunWANG ChangdanQIN XiaoguangYAO QingXU Haoran
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作者信息:1.上海市城市建设设计研究总院(集团)有限公司， 200120， 上海
2.上海市轨道交通结构耐久与系统安全重点实验室，201804， 上海
3.上海城建市政工程（集团）有限公司， 200065， 上海
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Affiliation:Shanghai Urban Construction Design and Research Institute, 200120, 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.2023.12.008
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中图分类号/CLCN:TU433∶U482.1
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栏目/Col:研究报告
摘要:
目的：随着城市轨道交通的快速发展，越来越多的城市开始建设有轨电车。有轨电车桩板结构路基是近年来提出的一种新型路基结构形式，现有一体化桩板结构路基在设计时没有考虑板下土体承受荷载，这将会导致设计保守，造价较高，工期较长等问题，一定程度上会制约有轨电车一体化桩板结构路基的推广和应用。方法：以某有轨电车工程为背景，采用离心模型试验与现场实测结果对比验证的方法，研究桩板结构在有轨电车荷载作用下随不同跨度条件下发生的沉降变形规律，在此基础上对原有设计方案进行优化，为一体化复合桩板结构路基的设计提供依据。结果及结论：研究表明：一体化桩板结构路基可以适量考虑板下土体承载能力，通过疏化桩体控制变形，形成一体化复合桩板结构路基；一体化桩板结构路基的离心模型试验数据与现场监测数据的规律相吻合，数值差异受土层性质影响，试验为最不利工程变形情况；在现有计算理论无法对板下土体承载精确计算时，可以在桩板结构设计方案的基础上，适当调整桩体跨度并通过试验验证后优化工程设计方案，在满足工程要求的同时，达到在城市区域施工过程中缩短工期及降低造价的目的。
Abstracts:
Objective: With the rapid development of urban rail transit, an increasing number of cities are adopting tram. Tram pileslab structure subgrade is a new form of subgrade structural form proposed in recent years. The existing integrated pileslab structure subgrade does not consider the loadbearing capacity of the soil beneath the slab during design, which may lead to conservative design, higher costs, and longer construction periods. These issues, to some extent, constrain the promotion and application of tram integrated pileslab subgrade structure.Method: Using a Tram project as background, centrifugal model test and fieldmeasured results are compared for verification, to investigate the settlement deformation law of pileslab structure under tram load action with different span conditions. Based on these findings, the original design scheme is optimized, providing a basis for the design of integrated composite pileslab structure subgrades.Result & Conclusion: It is indicated that an integrated pileslab structure subgrade can reasonably consider the loadbearing capacity of the soil beneath the slab. By controlling deformation through increasing pile spacing, an integrated composite pileslab structure subgrade can be formed. The centrifugal model test data for the integrated pileslab structure subgrade aligns with the fieldmonitored data, with numerical differences influenced by soil layer properties, and the test representing the most unfavorable engineering deformation situation. When precise calculations for the loadbearing capacity of the soil beneath the slab are not feasible using existing calculation theories, adjusting pile spacing based on the pileslab structure design scheme and optimizing the engineering design scheme through test verification can meet project requirements while achieving the goal of shortening construction periods and reducing costs during urban construction process.
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