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  

Centrifugal Model Test and Verification of Settlement Control for Tram Integrated Composite Pile-slab Structure Subgrade with Different Spans

作　　者：黄爱军 王长丹 秦晓光 姚青 许浩然 HUANG Aijun;WANG Changdan;QIN Xiaoguang;YAO Qing;XU Haoran(Shanghai Urban Construction Design and Research Institute,200120,Shanghai,China;不详)

机构地区：[1]上海市城市建设设计研究总院(集团)有限公司,上海200120 [2]上海市轨道交通结构耐久与系统安全重点实验室,上海201804 [3]上海城建市政工程(集团)有限公司,上海200065

出　　处：《城市轨道交通研究》2023年第12期43-49,共7页Urban Mass Transit

基　　金：国家自然科学基金项目(51778485,51608384)。

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。Objective:With the rapid development of urban rail transit,an increasing number of cities are adopting tram.Tram pile-slab structure subgrade is a new form of subgrade structural form proposed in recent years.The existing integrated pile-slab structure subgrade does not consider the load-bearing 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 pile-slab subgrade structure.Method:Using a Tram project as background,centrifugal model test and field-measured results are compared for verification,to investigate the settlement deformation law of pile-slab 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 pile-slab structure subgrades.Result&Conclusion:It is indicated that an integrated pile-slab structure subgrade can reasonably consider the load-bearing capacity of the soil beneath the slab.By controlling deformation through increasing pile spacing,an integrated composite pile-slab structure subgrade can be formed.The centrifugal model test data for the integrated pile-slab structure subgrade aligns with the field-monitored data,with numerical differences influenced by soil layer properties,and the test representing the most unfavorable engineering deformation situation.When precise calculations for the load-bearing capacity of the soil beneath the slab are not feasible using existing calculation theories,adjusting pile spacing based on the pile-slab 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.

关 键 词：有轨电车 一体化桩板结构 沉降控制 离心模型试验 现场监测 

分 类 号：TU433[建筑科学—岩土工程] U482.1[建筑科学—土工工程]