摘要
针对土中不同质量分数Zn^(2+)在快剪试验中的抗剪强度和电阻率的变化规律,分别制取了5种不同质量分数的Zn^(2+)污染土的试样进行室内试验,观测试验过程中剪应力和剪切位移、抗剪强度和Zn^(2+)所占土的质量分数、电阻率和剪切位移及抗剪强度和电阻率的变化,并收集数据进行分析;比较了50Hz和50kHz下的电阻率变化,根据电阻率和正压力的关系,提出原始电阻率和敏感度来反映污染土的性质。结果表明:Zn^(2+)污染土在剪切过程中没有明显的屈服点,剪应力随剪切位移的增加而增大;不同质量分数的Zn^(2+)污染土在直剪过程中的电阻率在50kHz下均随位移先减小、后略有增大,而50Hz下的电阻率在高浓度下变化反常,剪切过程电阻率测试频率应采用50kHz;定义了土体的原始电阻率和敏感度来反映污染土的电阻率特性,污染程度越高,原始电阻率值越小,敏感度越低。
To investigate the shear strength and electrical resistivity of Zn^(2+)-contaminated soil,five samples with different quality ratios were conducted by a series of laboratory tests to determine the relationships between shear stress and shear displacement,shear strength and pollution content,electrical resistivity and shear displacement,shear strength and electrical resistivity in test process.By collecting and analyzing the corresponding dates,the changes in the electrical resistivity at 50 Hz and 50 kHz were compared according to the relationship between electrical resistivity and pressure.The original electrical resistivity and the sensitivity were proposed to reflect the nature of contaminated soil.The results showed that the shear strength increased with increasing the displacement.In the shearing process,the electrical resistivity at 50 kHz of Zn^(2+)-contaminated soils with different quality ratios decreased and then increased slightly with increasing the displacement.However,the electrical resistivity at 50 Hz was unusual at high pollution contents.Therefore,it is suggested that the frequency of 50 kHz was used in the electrical resistivity tests.The sensitivity and the original electrical resistivity were used to reflect electrical resistivity properties of contaminated soil.The higher pollution degree,the lower original electrical resistivity and the sensitivity were.
出处
《中国科技论文》
CAS
北大核心
2016年第3期346-350,共5页
China Sciencepaper
基金
太原理工大学研究生科技创新基金资助项目(S2014038)
山西省回国留学人员科研资助项目(2013-043)
关键词
抗剪强度
电阻率
ZN^2+
污染土
shear strength
electrical resistivity
Zn2+
contaminated soil
