土工基础

›› 2018, Vol. 32 ›› Issue (4): 433-436.

• 工程实录 • 上一篇    下一篇

石英砂的掺量对钙质砂电导率的影响

蒋航海  1,2,3，陈伟俊1,3，姚锐丹  1，张晨阳1,3，崔 翔3   

  1. （1.广西大学土木建筑工程学院，南宁 530004;2.中机三勘岩土工程有限公司，武汉 430030；
    3.中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，武汉 430071）
  • 收稿日期:2017-06-15 修回日期:2017-07-29 出版日期:2018-08-20 发布日期:2018-08-23
  • 作者简介:蒋航海(1989-)，男，硕士研究生，研究方向为工程地质和地下水动力学。
  • 基金资助:

    国家自然科学基金面上项目（41572304，41372313）

Influence of Quartz Sand Content on the Electric Conductivity in Calcareous Sand

JIANG Hanghai1,2,3, CHEN Weijun1,3, YAO Ruidan1, ZHANG Chenyang 1,3, CUI Xiang3   

  1. (1.College of Civil Engineering, Guangxi University, Nanning 530004；
    2.China Machinery TIDI Geotechnical Engineering Co,Ltd..Wuhan 430030；
    3.State Key Laboratory of Geomechanics and Geotechnical Engineering,
    Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071)
  • Received:2017-06-15 Revised:2017-07-29 Online:2018-08-20 Published:2018-08-23

摘要： 灰沙岛土体的盐度较高，稀缺的地下淡水资源无法给动植物的生长提供一个长期稳定的栖息场所。入渗的雨水是灰沙岛的极其重要的淡水资源，电导率是反映盐度的一个参量，但由于各种原因，灰沙岛上的钙质砂常掺和石英砂，这对钙质砂电导率的影响程度是值得关心的。配制不同粒径和不同级配的钙质砂和石英砂的混合土样，通过CS655的土壤三参数传感器的测试和CR1000数据采集器的数据读取，混合土样的电导率随着石英砂掺量的增加，变化趋势是先减小后增大再减小，多数情况下，第一次出现波谷在石英砂掺量为20%左右，故石英砂掺量为20%时可有效减少钙质砂土层的电导率，可作为在实际运用中的参考数据。

关键词: 电导率, 钙质砂, 石英砂掺量

Abstract: The salinity rich in soil in the sandy coral island and lack of the underground fresh water resources cannot provide a longterm and stable habitat for animals and vegetations. The rain infiltration is the most important conservation of the freshwater resources in these sandy coral islands. Soil conductivity is a parameter that reflecting the salinity,but for various reasons,the grey calcareous sand often mixed with quartz sand,this effects on the conductivity of calcareous sand is of concern to us.The mixed calcareous and quartz sand samples with different particle sizes and different gradations are prepared for the laboratory tests. The threeparameter sensor used in the soil testing was CS655 type and the data were recorded by CR1000 data acquisition system. The results indicate that, the mixed soil conductivityincreased with the increase of quartz sand content and the change trend was first decreased, then increased and then decreased again with the quartz content, in most cases. In the first time the low conductivity appeared at a quartz sand content of approximately 20%. Therefore, this quartz sand content of 20% can effectively reduce the conductivity of calcareous sandy soil.

Key words: Conductivity； Calcareous soil, Quartz sand content