Research On Three-dimensional Site Monitoring System Based On Orthogonal Diagonal Wenner Method

Soil contamination is the most complex of many contaminations,and the difficulty of remediation is the greatest at the same time.Therefore,the detection and remediation of soil contamination is a crucial issue,and also a problem to be solved urgently.There are many ways to detect and remedy soil pollution.The traditional way to detect soil pollution is chemical analysis of drilling sampling.The disadvantages of chemical analysis of drilling sampling are obvious.First,it needs huge manpower and material resources,and the cost is relatively high.Secondly,the whole process of sampling and analysis has a long period.Sampling and analysis can not determine the whole contaminated area,and the spatial resolution is not high.During the whole sampling process,it is easy to cause secondary pollution to the sampling area.And the sampling analysis method can not detect the detection area in real time.Resistivity method,as a new method of geophysical exploration,can solve the problems mentioned above.Resistivity method has been applied in pollution detection,but there is still much room for improvement in the research of detection devices.This paper has solved practical problems as a starting point,research and design of resistivity detection device.Based on the electrical mechanism and polarization principle of soil and the measurement principle of complex resistivity of soil,a three-dimensional detection system based on LabVIEW is designed and developed in this paper.This system realizes real-time detection of complex resistance in target area and display of three-dimensional image.The system mainly includes signal output function,signal acquisition function,and spectrum analysis function of the signal,real-time display of the output and collected signal,and save the acquisition complex resistivity value.In order to verify the stability and accuracy of the complex resistivity measuring device,indoor test of contaminated soil was carried out.In the interior,cover-less wooden boxes with length,width and height of 3 m,1.5 m and 1.5 m are built.Plastic film is laid inside the boxes.Fine sand with relatively uniform texture is put into the boxes to simulate the soil,and then the complex resistivity of the soil is measured.By placing different low resistivity bodies in fine sand to simulate pollutants,the variation of complex resistivity is observed and measured to determine the reliability and stability of the whole measuring device.This paper mainly discusses how the experimental device distinguishes the difference between the polluted and non-polluted areas in indoor experiments,which can provide reference for actual pollution monitoring and help for future pollution remediation and detection.