摘要
在深厚软土地区进行公路建设,常由于交通荷载和路堤荷载等作用,造成工后沉降量过大、不均匀沉降等现象。以浙江省台州湾大桥及接线工程采用泡沫混凝土置换高速公路宕渣路堤为例,通过有限元方法对典型断面的工后沉降进行模拟,提出了该工程不同路段的合理换填厚度,对其他类似工程具有一定的参考意义。依据现场试验沉降观测数据,分析泡沫混凝土换填前后路基沉降控制效果。泡沫混凝土换填路基技术可以大幅度降低填土荷载,减少软基的附加应力,从而达到抑制沉降和侧移、提高路堤稳定性的效果。现场沉降观测结果表明,换填前大部分路段预压期末沉降速率不满足规范要求,换填后沉降观测结果显示沉降速率为2 mm/月~4 mm/月,依据换填后沉降变化采用sep程序所预测的工后沉降大幅减少,路基沉降控制效果明显。
When highway construction is carried out in deep and soft soil areas,excessive settlement and uneven settlement after construction often occur due to the action of traffic load and embankment load.In the paper,taking the Taizhou Bay Bridge and access roads project in Zhejiang Province as an example,foam concrete is used to replace the slag embankment of expressway.The post-construction settlement of typical sections is simulated by finite element method,and the reasonable replacement thickness of different sections of this project is put forward,which has certain reference significance for other similar projects.The settlement control effect of subgrade before and after foam concrete replacement are analyzed based on the settlement observation data of field test.Foam concrete replacement subgrade technology can significantly reduce the filling load and reduce the additional stress of soft foundation,so as to inhibit settlement and lateral displacement,and improve the stability of embankment.The field settlement observation results show that the settlement rate at the end of pre-compression period of most sections before replacement does not meet the specification requirements.The settlement observation results after replacement show that the monthly settlement rate is 2 mm~4 mm.According to the settlement change after replacement,the post-construction settlement predicted by sep program is significantly reduced,and the subgrade settlement control effect is obvious.
作者
林立宏
秦小华
阮映辉
张嘉乐
陈龙
LIN Li-hong;QIN Xiao-hua;RUAN Ying-hui;ZHANG Jia-le;CHEN Long(Zhejiang Taizhou Coastal Expressway Co.Ltd.,Taizhou 318000,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China;Institute of Ocean and Offshore Engineering,Nantong Hohai University,Nantong 226334,China)
出处
《公路》
北大核心
2023年第9期88-95,共8页
Highway
基金
浙江省交通运输厅科技计划项目,项目编号2020029
国家自然科学基金项目,项目编号52178327
中央高校基本科研业务费项目,项目编号B210202032。
关键词
泡沫混凝土
换填路基
沉降变化
现场试验
foam concrete
subgrade replacement
settlement changes
field test
