铬污染场地电阻率法探测效果研究

为了研究高密度电阻率法对铬污染场地的探测效果,建立了典型铬污染模型,采用有限差分法以及最小二乘法对其进行正反演计算,分析铬污染的电阻率特征,得到了高密度电阻率法不同装置类型下的不同污染程度的探测效果。随后对河北某铬污染场地进行高密度电阻率法探测,得到该厂区地下污染羽的分布范围,探测结果得到了钻孔取芯验证。通过理论分析和实际探测结果表明,地下土体受到铬污染后,其电阻率表现为相对低阻特征,与同层未污染土体存在明显的电阻率差异;随着污染程度减弱,高密度电阻率的识别能力也随之降低,并且不同装置类型的探测效果也存在差异。

Research on the Detection Effect of the Resistivity Method in Chromium Contaminated Site

To study the detection effect of the high-density electrical resistivity method on chromium-contaminated sites, the resistivity model of chromium pollution was established. The finite difference method and the least square method were used to perform forward and inversion to analyze the resistivity characteristics of chromium pollution. Then, the detection effect of different pollution concentrations under different device types is obtained. Subsequently, the high-density electrical resistivity method was carried out on a chromium contaminated site in Hebei, and the distribution of the underground pollution plume was obtained. The detection results were verified by drilling. Theoretical analysis and actual detection results show that the resistivity of underground soil polluted by chromium is relatively low, which is significantly different from that of uncontaminated soil. With the weakening of pollution degree, the identification ability of high-density electrical resistivity also decreases and the detection effects of different device types are also different. The above research results provide an important theoretical and practical basis for the site investigation of the same type of heavy metal pollution in the future.