江苏海相黏土电阻率与岩土特性参数间相关性研究

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摘要土的电阻率是表征土体导电性的基本参数，也是土体固有物性的综合指标之一。电阻率静力触探技术是一种可原位测试土体电阻率的新型测试技术。首先介绍了江苏海相黏土和电阻率静力触探技术，采用电阻率静力触探在江苏海相黏土场地进行了原位测试，得到土的原位电阻率测试值，结合室内基本土工试验，分析了该海相黏土电阻率与基本土性指标和力学特性指标间的相关关系。研究结果表明：孔隙液含盐量、黏粒含量和塑性指数是电阻率的主控因素。电阻率随孔隙液含盐量、黏粒含量增加而减小，两者与电阻率均呈现较好的指数相关性，孔隙液含盐量大于6 g/L或黏粒含量大于60 %时，电阻率趋于定值；江苏海相黏土电阻率随塑性指数的增加而减小；其他岩土特性指标对电阻率存在一定的影响，但与电阻率之间相关性不显著。

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	蔡国军
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关键词 ：海相黏土, 电阻率, 孔压静力触探, 岩土特性

Abstract：The resistivity of soil is a basic parameter to describe its electrical conductivity and one of the inherent physical properties of soil. The resistivity piezocone penetration test is a new kind of in-situ testing technique, which can measure the resistivity of the soil. The marine clay in Jiangsu province of China and the measuring equipments and the operation principles of the resistivity piezocone penetration test are introduced. Based on the measurements of soil resistivity and the laboratory test results, the relationship among the resistivity of marine clay, basic soil index and mechanical properties is analyzed. It is concluded that the salt content of pore fluid, clay content and plasticity index are the main controlling factors of the soil resistivity. The resistivity decreases with the increase of the salt content of pore fluid and the clay content, and there is a good exponential decay relationship between the resistivity and the two indexes. When the salt content of pore fluid is greater than 6 g/L or the clay content greater than 60%, the value of resistivity tends to be a constant. The resistivity decreases with the increase of the plasticity index of soil with different plastic degrees. Although other characteristic indexes have a certain influence on the resistivity, the correlations between the resistivity and those indexes are not significant.

Key words： marine clay resistivity piezocone penetration test geotechnical characteristic

收稿日期: 2013-01-14

TU413

基金资助:国家自然科学基金项目（41202203）

通讯作者: *通讯作者

作者简介: 蔡国军(1977- )，男，山东兖州人，博士，副教授，主要从事多功能孔压静力触探等现代原位测试技术方面的研究工作。E-mail: focuscai@163.com。

引用本文:

蔡国军, 张涛, 刘松玉, 邓永锋, 邹海峰. 江苏海相黏土电阻率与岩土特性参数间相关性研究[J]. 岩土工程学报, 2013, 35(8): 1470-1477. CAI Guo-jun, ZHANG Tao, LIU Song-yu, DENG Yong-feng, ZOU Hai-feng. Relationship between electrical resistivity and geotechnical characteristic parameters for Jiangsu marine clay. Chinese J. Geot. Eng., 2013, 35(8): 1470-1477.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2013/V35/I8/1470

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