杭州淤泥质土的电渗电导率特性研究

doi:10.13722/j.cnki.jrme.2018.1434

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摘要采用改进的Miller Soil Box试验装置，基于杭州淤泥质土，在3种不同含水量和含盐量下开展电渗试验，从总电导率和区域电导率2个方面分析土体电导率变化规律和分布特征，以揭示杭州淤泥质土的电渗电导率特性。结果表明：不同初始含水量下，土体总电导率相近，均随通电时间逐渐减小，同时土体总电导率与实时含水量呈近似线性变化，线性变化率随初始含水量的增加而降低；不同初始含盐量下，土体总电导率呈现先上升后下降并最终趋于平缓的变化，电渗前期，总电导率峰值随初始含盐量的增大而增大，峰值出现时间随初始含盐量提高而推迟，电渗后期，不同初始含盐量下土体总电导率趋于相近；随着电渗的开展，土体电导率分布不均匀性先逐渐增大后有所缓解，最终阴极附近区域土体电导率与其他区域差异较大；不同含水量或含盐量下，土体电导率分布在电渗前期差异较大，后期趋于相近。研究成果可进一步揭示电渗机制，为电渗法设计计算方法的提出提供理论依据。

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关键词 ：土力学, 杭州淤泥质土, 电渗, 电导率, 含水量, 含盐量

Abstract：Using the modified Miller Soil Box，a series of experiments for Hangzhou silty soil were conducted under three different levels of initial water content and salt content. In order to obtain the variation discipline and distribution feature of soil electro-osmotic conductivity，experiment results were interpreted from the perspectives of the overall soil conductivity as well as the regional soil conductivity. Under different initial water content，it is demonstrated that the overall soil conductivities are adjacent and decrease during electro-osmosis，meanwhile the overall soil conductivities change linearly with spot water content and the change rate decreases with increasing initial water content. Under different initial salt content，a variation of first increasing to the peak and then decreasing to the balance is observed for the overall soil conductivity. The peak value is higher and appears later with higher initial salt content while the overall soil conductivities are similar at later stages of electro-osmosis. It is also found that the inhomogeneity of the soil conductivity distribution firstly increases and then decreases during electro-osmosis and huge difference exists between the soil conductivity near the cathodic region and other regions. Under varied initial water content or salt content，the soil conductivity distributions vary at earlier stages of electro-osmosis and are similar at later stages of electro-osmosis. The obtained results can further reveal the electro-osmotic mechanism and provide references for the design and calculation methods of electro-osmotis technique.

Key words： soil mechanics Hangzhou silty soil electro-osmosis conductivity water content salt content

引用本文:

罗战友1，2，陶燕丽1，2，周建2，邹宝平1，祝行1. 杭州淤泥质土的电渗电导率特性研究[J]. 岩石力学与工程学报, 2019, 38(S1): 3222-3228.
LUO Zhanyou1，2，TAO Yanli1，2，ZHOU Jian2，ZOU Baoping1，ZHU Hang1. Study on electro-osmotic conductivity of Hangzhou silty soil. , 2019, 38(S1): 3222-3228.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2018.1434 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS1/3222

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