Cu^(2+)对温州软粘土电阻率特性影响的试验研究

Tests on electrical resistivity characteristics of Wenzhou soft clay with Cu^(2+)

温州制革、电镀等轻工业发达,废水中Cu^(2+)含量较高,多处地下水和土壤受到污染。选取典型温州软黏土,将土样重塑,加入不同浓度的Cu^(2+)和适量水泥进行固化,通过测试不同土样电阻率来研究Cu^(2+)对土体性能的影响。电阻率测试在改装的一维压缩固结试验中进行,压缩中部分土样电阻率变化不显著,但可量测到压缩过程中电阻率的变化规律。试验结果表明:电阻率可以很好地评估加入水泥之后土体性质的改变,在实际工程中可以用来反映土体的污染程度;土体在Cu^(2+)含量和含水量很高时,不宜采用电阻率法评估土体污染压缩的过程。

The previously developed industry has contaminated part of groundwater and soils in Wenzhou with high concentration of Cu 2+in waste water,such as tannery,electroplating and etc.To study the characteristics of typical Wenzhou soft clay with Cu 2+,the soil samples are remodeled to test the electrical resistivity with different concentrations of Cu 2+and reasonable amount of cement for consolidation.Electrical resistivity tests were carried out via the self-designed one-dimensional consolidation compression apparatus.The resistivity variation can be directly observed during the compression process.The testing results indicate that:while the concentration of Cu 2+and water in soil is high,electrical resistivity measurement should not be applied to assess the compression process of the soil.However,this measurement is a good indication for characteristics changes in soil after adding cement.Therefore the electrical resistivity might be taken as an effective means to estimate the degree of contamination of soil in practical engineering.