薛润坤,李飒,林澜,等.2020.基于动力触探钙质砂物理性质指标评价研究[J].工程地质学报,28(4):734-739.doi:10.13544/j.cnki.jeg. 2019-301.
    引用本文: 薛润坤,李飒,林澜,等.2020.基于动力触探钙质砂物理性质指标评价研究[J].工程地质学报,28(4):734-739.doi:10.13544/j.cnki.jeg. 2019-301.
    Xue Runkun,Li Sa,Lin Lan,et al.2020.Physical indexes of carbonate sand with dynamic penetration test[J].Journal of Engineering Geology,28(4): 734-739.doi: 10.13544/j.cnki.jeg.2019-301.
    Citation: Xue Runkun,Li Sa,Lin Lan,et al.2020.Physical indexes of carbonate sand with dynamic penetration test[J].Journal of Engineering Geology,28(4): 734-739.doi: 10.13544/j.cnki.jeg.2019-301.

    基于动力触探钙质砂物理性质指标评价研究

    PHYSICAL INDEXES OF CARBONATE SAND WITH DYNAMIC PENETRATION TEST

    • 摘要: 钙质砂通常是指碳酸钙含量大于50%的沉积物,与普通石英砂相比,其具有特殊的物理力学性质。圆锥动力触探试验是一种常用的土工原位测试方法,目前有关动力触探贯入指标与土体物理力学性质之间关系的研究多集中于黏土和普通石英砂,针对钙质砂的相关成果较少。有鉴于钙质砂的特殊性质,现有的评价方法是否适用于钙质砂存在较大的争议。为解决这一问题,本次研究在总结前人研究成果的基础上,通过现场轻型动力触探试验,对其贯入指标与钙质砂平均粒径、各类密度和密实度之间的关系进行了探讨,采用数据拟合的方法建立了动力触探贯入指标与相应物理指标之间的表达式。残差分析显示,这些公式具有一定的精度,相应的研究成果可为相关规范的修订以及实际工程的设计与施工提供参考。

       

      Abstract: Carbonate sand usually refers to the sediment with calcium carbonate content more than 50%. It has special physical and mechanical properties compared with the terrestrial sand. The dynamic cone penetration test is widely used to evaluate the engineering properties of soils. At present, the study of relationship between dynamic cone penetration indexes and soil physical properties are focused on clay and siliceous sand while weather the existing evaluation method is suitable for carbonate sand is controversial. To address the problem, in this study, a serious of field light dynamic penetration test are conducted to investigate the relationships of the dynamic cone penetration index with respect to the physical indexes including mean particle size, various densities, and relative density of the carbonate sand. Based on results of in situ tests, the relationships between the dynamic cone penetration index and physical indexes are established for the carbonate sand. The residual analysis shows that these formulas achieve certain accuracy. It can be found that to establish the relationship between penetration index and various densities as well as relative density need to consider the influence of average particle size, which is related to the easy crushing of carbonate sand. These results can be useful for engineers to evaluate engineering properties of carbonate sand in practice.

       

    /

    返回文章
    返回