适于黄土高填方路堤综合压实技术的应用研究

发布时间：2019-04-16 11:40

【摘要】：以太原市太行路阎家峰路段为工程应用对象,提出并应用一种适于黄土填料高填方路堤的分层碾压与重锤补夯相结合的综合压实技术。通过结合施工进程的土性试验、现场深层沉降监测等试验手段,研究高填方路堤黄土填料的压实特性、重锤补夯的强化机制及路基的综合压实效果。相关土性试验研究结果表明:分层碾压后的土体再经重锤补夯作用后,压实度、压缩模量等参数得到大幅提高,并随填方深度均呈周期性的锯齿形曲线变化形态。沉降监测及分析结果表明:该综合压实技术处理后的路堤工后沉降显著减小,趋于稳定的最大工后路面沉降仅为路堤高度的0.1%,且填方体的自身压缩变形为总沉降的主要组成部分;填方体工后沉降与时间呈对数关系,依此提出填方体工后沉降的预测公式,与实测值吻合较好。
[Abstract]:Taking the Yanjiafeng section of Taiyuan Taihang Road as the engineering application object, a comprehensive compaction technology is put forward and applied, which is suitable for the combination of layered compaction and heavy hammer tamping of high fill embankment with loess packing. The compaction characteristics of loess fillers of high fill embankment, the strengthening mechanism of heavy hammer tamping and the comprehensive compaction effect of roadbed are studied by means of soil test in construction process and on-site deep settlement monitoring. The experimental results of soil properties show that the compaction degree and compression modulus of the layered compacted soil are greatly improved after being compacted by heavy hammer, and the zigzag curve changes periodically with the filling depth. The results of settlement monitoring and analysis show that the post-construction settlement of the embankment treated by the integrated compaction technology is significantly reduced, and the maximum post-construction settlement tends to be only 0.1% of the embankment height. The self-compression deformation of the fill body is the main part of the total settlement. There is a logarithmic relationship between post-construction settlement and time of fill, so the prediction formula of post-construction settlement of fill body is put forward, which is in good agreement with the measured value.
【作者单位】：太原理工大学建筑与土木工程学院;北京市政建设集团有限责任公司第三工程处;
【基金】：国家自然科学基金项目(51178287) 北京市政建设集团有限责任公司研发项目(2014-08)
【分类号】：U416.1

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