基于电阻率法的固化重金属污染土碳化深度评价方法

Evaluation method of carbonization depth of solidified heavy metal contaminated soil based on resistivity method

通过水泥固化重金属污染土室内加速碳化试验,结合电阻率的测试方法,测试水泥固化重金属污染土电阻率随碳化时间和碳化深度的变化规律,提出基于电阻率法的固化重金属污染土的碳化深度评价方法。研究结果表明:随着碳化过程的进行,水泥固化重金属污染土的电阻率不断增加,且增加速率不断减小;随着试样初始含水率增加和试样干密度减小,水泥固化重金属污染土的电阻率不断减小;随着水泥掺入量增加和铅质量分数减小,水泥固化重金属污染土电阻率增大;水泥固化重金属污染土碳化深度和电阻率之间满足线性相关性,研究成果可为水泥固化重金属污染土碳化深度的快速、无损测试提供理论依据。

Based on the indoor accelerated carbonation test of cement solidified heavy metal contaminated soil and combined with the resistivity method, the law of the resistivity of solidified heavy metal contaminated soil varying with carbonation time and carbonation depth was tested. The evaluation method of carbonation depth of solidified heavy metal contaminated soil based on the resistivity method was proposed. The results show that the resistivity of cement stabilized soil increases and the increasing rate decreases during the carbonization test. The resistivity of cement solidified heavy metal contaminated soil decreases as the initial water content increases and the dry density decreases. The resistivity of cement solidified heavy metal contaminated soils increases with the increase of cement content and the decrease of lead mass fraction. There is a linear correlation between carbonization depth and resistivity of cement solidified heavy metal contaminated soil. The results of the study can be used as a theoretical basis for rapid and non-destructive testing of the carbonation depth of cement solidified heavy metal contaminated soils.