Study On Evaluation Of Dyeing Contaminated Site Based On Resistivity Piezocone Penetration Test RCPTU

With the rapid development of the national economy,the threat of the serious pollution status to the national economy and people’s health is becoming more and more serious.CPTU testing technology is a new type of in-situ testing technology which is fast,continuous,affordable and reliable.With the development of sensor technology,a series of new CPTU-based sensors have been developed internationally.Resistivity sensor is a new type of sensor used in CPTU applications.Through the detection of multi-resistivity CPTU,the resistivity values of various locations in the soil can be obtained,and the trend of the resistivity in various directions in the soil is obtained through the data of multiple test holes.Based on the CPTU test technology and the existing theory of soil resistivity,this paper combines the site resistivity CPTU test of typical contaminated sites with the laboratory test after sampling to summarize the method of evaluating the pollution distribution of contaminated sites based on the resistivity CPTU.And further based on the resistivity CPTU test,the transport and variation of pollutants in the site were discussed and analyzed.The main research contents are as follows:(1)The typical chemical plant contaminated site is selected to conduct a detailed on-site resistivity CPTU test.At the same time on-site sampling conducted a wide range of indoor tests.The pH,conductivity,concentration of contaminants in the site and the moisture content,particle size distribution,density,organic matter content,particle proportion,liquid and plastic limitation of contaminated soil were analyzed and tested.The large amount of test data obtained from the tests provides the basis for further analysis.(2)Combined with the actual project case,comparative analysis of soil resistivity obtained from CPTU resistivity and pollution data from laboratory analysis is conducted.Through the comparison and analysis of the resistivity of soil and the types and distribution of pollutants in the contaminated site,the relationship between the resistivity of soil and the distribution of pollutants is obtained.The establishment of a more detailed pollutant species and concentration estimation method based on the CPTU resistivity data in this site and the demonstration that this method can be similarly applied to other contaminated sites and reached a preliminary conclusion that the resistivity CPTU In situ test data Derived estimates of the site in situ continuous contaminant distribution goals.(3)Combined with the field test of CPTU in-situ test and resistivity test,the project examples are analyzed.Based on the established model of pollutant distribution,the resistivity CPTU is applied to the analysis of pollutant transport and change.Based on the test data of resistivity CPTU,the paper discusses the possibility of establishing the estimation method of pollution transport in contaminated sites.The application of resistivity CPTU test data in partial migration mode and the potential of new potential CPTU probe in the future are analyzed.