有轨电车路基板-疏桩基础长期沉降现场实测与数值分析  

Monitoring and Numerical Study of Long-Term Settlement of Track Bed with Sparse Pile Foundation for Tram

作　　者：徐正良 刘磊[2,3] 王浩然 俞剑 黄茂松[2,3] XU Zhengliang;LIU Lei;WANG Haoran;YU Jian;HUANG Maosong(Shanghai Urban Construction Design and Research Institute(Group)Co.,Ltd.,Shanghai 200125,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education,Tongji University,Shanghai 200092,China)

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200125 [2]同济大学地下建筑与工程系,上海200092 [3]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《同济大学学报（自然科学版）》2021年第3期421-430,共10页Journal of Tongji University:Natural Science

基　　金：有轨电车轨道与路基结构全装配式技术研究及应用(2018-k9-034)。

摘　　要：有轨电车路基板‒疏桩基础的目的在于避免长期轮压循环荷载造成软土路基显著沉降。为掌握其长期沉降特性,基于南方某实际有轨电车工程开展长达两年的工后沉降监测。结果表明:在运行初期路基沉降发展迅速,运营约一年后沉降速率变缓并于两年后趋于稳定,且绝对沉降量远小于容许值。该研究又基于土体累积应变显式模型提出了黏土中路基板‒疏桩基础的长期循环累积沉降等效有限元分析方法,经与监测值对比验证其合理性,并采用等效有限元探讨路基板‒疏桩基础的承载力机理。The track bed with sparse pile foundation was developed to avoid the excessive settlement of track beds due to long-term cyclic wheel-pressure.To understand the settlement development,a two-year monitoring of an actual tram project in a southern city in China was reported.The results reveal that the settlement of the track bed increased rapidly in the initial stage.The settlement gradually reduced after around one year and tends to be stable after two years.Moreover,based on the explicit cumulative strain model,an equivalent finite element method is proposed for predicting the long-term cumulative settlement of the track bed with sparse pile foundation.A good agreement between the monitored and calculated results demonstrates the rationality.Furthermore,discussions on the bearing mechanism of the track bed with sparse pile foundation are presented.

关 键 词：有轨电车 路基板‒疏桩 长期沉降 等效有限元 

分 类 号：TU433[建筑科学—岩土工程]