郅彬, 王番, 王永鑫, 武李和乐, 焦航. 2018: 高填方下覆结构性黄土次固结特性研究. 工程地质学报, 26(6): 1447-1453. DOI: 10.13544/j.cnki.jeg.2017-415
    引用本文: 郅彬, 王番, 王永鑫, 武李和乐, 焦航. 2018: 高填方下覆结构性黄土次固结特性研究. 工程地质学报, 26(6): 1447-1453. DOI: 10.13544/j.cnki.jeg.2017-415
    ZHI Bin, WANG Pan, WANG Yongxin, WU Lihele, JIAO Hang. 2018: STUDY ON PROPERTIES OF SECONDARY CONSOLIDATION OF STRUCTURED LOESS UNDER HIGH FILL. JOURNAL OF ENGINEERING GEOLOGY, 26(6): 1447-1453. DOI: 10.13544/j.cnki.jeg.2017-415
    Citation: ZHI Bin, WANG Pan, WANG Yongxin, WU Lihele, JIAO Hang. 2018: STUDY ON PROPERTIES OF SECONDARY CONSOLIDATION OF STRUCTURED LOESS UNDER HIGH FILL. JOURNAL OF ENGINEERING GEOLOGY, 26(6): 1447-1453. DOI: 10.13544/j.cnki.jeg.2017-415

    高填方下覆结构性黄土次固结特性研究

    STUDY ON PROPERTIES OF SECONDARY CONSOLIDATION OF STRUCTURED LOESS UNDER HIGH FILL

    • 摘要: 研究结构性黄土的次固结特性及机制,已成为黄土高填方地基工后沉降计算和控制的有效手段。本文通过对结构性黄土的压缩试验,研究了其次固结特性及变形机制,建立了描述次固结系数时间效应的关系式。试验结果表明,结构性黄土存在明显的次固结效应;荷载-次固结系数曲线(P-Cα)表现出先增加后减小,最终趋于稳定;Cα峰值对应荷载大于Pc,且高荷载将不是次固结系数的主要控制因素;在岩土破损力学框架内,分析了荷载、含水率对次固结系数影响的机制;水对土颗粒胶结作用的弱化使得高含水率结构性黄土的P-Cα曲线只呈现下降段和稳定段;建立了一种描述次固结系数时间效应的关系式,可对计算高填方下覆原有黄土地基的工后沉降提供帮助。

       

      Abstract: Study on secondary consolidation characteristics and mechanism of structured loess has become an effective means of calculating and controlling post-construction settlement in loess high fill foundation. In this paper, the secondary consolidation characteristics and deformation mechanism are studied by means of compression test of structured loess. Then the formula describing the time effect of secondary settlement coefficient is established. The test results show that an obvious secondary-consolidation effect exists in structured loess. The load coefficient of secondary consolidation curve(P-Cα)increases first and then decreases, and it finally tends to be stable. The peak of Cα corresponding to the loading value is greater than Pc. High stress loads are not major controlling factor of the secondary consolidation coefficient. The influence mechanism of load and water content on secondary settlement coefficient is analyzed based on geotechnical mechanics. The P-Cα curve of structured loess in high water content only decreases and tends to be a stable period by weakening effect of water on soil particles. Establishing the formula describing the time effect of secondary settlement coefficient can provide help for post-construction calculation of the covered original loess foundation in high fill engineering.

       

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