箱式路基端承式复合地基静动力性能室内模型试验研究  

Laboratory Model Test on Static and Dynamic Characteristics of Box⁃type Subgrade Structure End⁃bearing Composite Foundation

作　　者：王亚威 WANG Yawei(China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道建筑》2023年第10期107-111,共5页Railway Engineering

基　　金：中国铁路总公司科技研究开发计划(2017G008-C);中铁第四勘察设计院集团有限公司科研课题(2020K035)。

摘　　要：为了研究箱式路基端承式复合地基的动静态与抗变形性能,设计了箱式路基结构及下部端承复合地基相似试验模型,进行了静力分级加载与低周频循环加载试验,分析了复合地基在分级静力和长期疲劳加载过程中的变形演化趋势及地基压力分布。结果表明:在铁路静载下,箱式路基及下部结构处于弹性工作范围,并通过分析地基的桩土压力规律,复合地基内桩土传力机制正常。在铁路疲劳加载下,箱式路基复合路基累积沉降差异较小,没有出现明显不均匀沉降,且传力路径稳定,整体性良好。In order to study the dynamic,static,and deformation resistance performance of the end bearing composite foundation under the box-type subgrade,a similar test model of the box-type subgrade structure and the lower end bearing composite foundation was designed.Static graded loading and low frequency cyclic loading tests were conducted,and the deformation evolution trend and foundation pressure distribution of the composite foundation during graded static and long-term fatigue loading were analyzed.The results indicate that under the static load of the railway,the box-type subgrade and its substructure are in the elastic working range.By analyzing the pile soil pressure law of the foundation,the pile soil force transmission mechanism in the composite foundation is normal.Under railway fatigue loading,the cumulative settlement difference of the box-type composite subgrade is relatively small,without significant uneven settlement.The force transmission path is stable,demonstrating good overall integrity.

关 键 词：箱式路基 端承式复合地基 相似试验 静动力特性 长期变形 

分 类 号：U213.1[交通运输工程—道路与铁道工程]