Research On Electrical Resistivity Characteristics Of Cement Solidified Contaminated Soil By Coal-gas Wastewater

The resistivity method is a method to detect the strength of solidified soil.According to the relationship between the resistivity and the strength,the strength of the solidified soil can be calculated by measure the resistivity.Therefore,this method has the advantages of in situ and nondestructive.The strength of the solidified soil is measured by the resistivity method in engineering construction.In engineering construction,cement is often used as reinforcement material.If soil is polluted,the reinforcement effect will be affected.The Inner Mongolia Autonomous Region is rich in coal resources,the development of related industry full of youthful spirit,which the coal gas industry is a typical application of the coal industry.The development of coal gas produces a large amount of industrial waste water,due to the limited processing capacity and emission problems caused a large area of soil pollution.As a result the solidification of cement to the soil will be affected.In the frozen soil region of North China,the soil is affected by the freeze-thaw cycle.Therefore,this paper will study the strength and resistivity characteristics of cement stabilize coal gas wastewater contaminated soil.Some experiments were carried out under freeze-thaw cycles.Finally,the relational model between unconfined compressive strength and resistivity will be established.The experimental soil used in this project is the silty clay collected from Qian Bu Ta Qi village in Hohhot.Humic acid is used to replace coal gas wastewater to pollute soil.The unconfined compressive strength,resistivity and porosity of cement stabilized coal gas wastewater contaminated soil was studied with the method of laboratory test with the change of pollution degree,cement content,curing age and freeze-thaw cycles,and the relationship between unconfined compressive strength and resistivity will be established.In this paper,based on a series of studies on the cement stabilized coal gas wastewater contaminated soil,the following conclusions are obtained:(1)The unconfined compressive strength decreased with the increase of the degree of contamination and the number of freeze-thaw cycles,and the rate of decline is gradually increasing,with the increase of cement content and curing age,at 60 d,the intensity reaches its peak;(2)The resistivity decreases with the increase of the degree of contamination and the number of freeze-thaw cycles,and the rate of decline is gradually increasing,with the increase of cement content and curing age,when 60 d,the resistivity basically reaches its peak;(3)The porosity increases with the degree of contamination and the number of freeze-thaw cycles,with the increase of cement content and curing age;(4)The unconfined compressive strength was positive correlated with resistivity,and the relationship between unconfined compressive strength and resistivity is established.