滨海细砂路基沉陷机理

发布时间：2018-05-15 06:18

本文选题：细砂路基 + 路基沉陷　；参考：《同济大学学报(自然科学版)》2017年03期

【摘要】：为了揭示滨海细砂路基沉陷机理,在实地调研和文献调研的基础上,通过路基湿度状态分析、重复动三轴试验和固结变形试验,研究基于淤塞效应的滨海细砂路基累积沉降量.研究结果表明:滨海细砂路基沉陷主要由细砂渗流—迁移—淤塞现象引发的细砂路基动力变形、固结变形以及砂土流失三部分组成;施工期间,高雨强条件下降雨入渗水流引发细砂迁移—淤塞现象,使得砂芯长时间处于高含水率状态;运行期间,淤塞且过湿的砂芯在重载交通和土压力长期作用下出现过量的动力变形和少量固结变形,从而引发细砂路基沉陷现象.
[Abstract]:In order to reveal the settlement mechanism of seashore fine sand subgrade, the cumulative settlement of coastal fine sand roadbed based on silt effect was studied through the analysis of moisture state of subgrade, repeated dynamic triaxial test and consolidation deformation test on the basis of field investigation and literature investigation. The results show that the settlement of seashore fine sand subgrade is mainly composed of three parts: dynamic deformation, consolidation deformation and sand loss caused by fine sand seepage, migration and silt. Under the condition of high rainfall and strong rainfall, the fine sand migration and silt are caused by rainfall infiltration flow, which makes the sand core in high water content for a long time. Under the long-term action of heavy load traffic and earth pressure, the silted and overwet sand core causes excessive dynamic deformation and a small amount of consolidation deformation, which leads to the settlement of fine sand subgrade.
【作者单位】：同济大学道路与交通工程教育部重点实验室;中国路桥工程有限责任公司;
【基金】：财政部专项资金(2012MF001) 上海市科学技术委员会科研计划(11231201900)
【分类号】：U416.1

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