Experimental Study On The Influence Of Nanomaterials On Consolidation Of Soft Soil Under Electric Filed

Soft soil is widely distributed in coastal areas and has the characteristics of high water content,large pore ratio,high compressibility,poor permeability and low shear strength.It is difficult to be used as a natural foundation without proper foundation treatment.In this paper,axisymmetric electroosmosis consolidation test was carried out for soft soil to analyze the variation law of current,potential,moisture content,displacement,p H value,shear strength and bearing capacity with the electroosmosis process.The electroosmotic consolidation effect was improved by mixing Ghana rice Si O₂ particles and nanometer Fe₃O₄ solution,and the drainage consolidation effect was promoted by combining the preloading method and the electroosmotic consolidation method.Combined with the macroscopic properties and microstructure of soil,the mechanism of electroosmosis consolidation is revealed.The main conclusions are as follows:(1)By conducting the electroosmotic consolidation test of nano-Si O₂ particles affecting the soft soil,it is found that when the nano-Si O₂ content is 3‰,the current,potential,displacement,fracture area,shear strength and bearing capacity of the soil reach the maximum value,indicating that the optimal nano-Si O₂ content is 3‰.(2)By carrying out the electroosmotic consolidation test of nano-Fe₃O₄ solution affecting soft soil,the comparison analysis of current,potential,moisture content,displacement,shear strength and bearing capacity shows that the order of influence on electroosmotic consolidation effect is 2‰,3‰and 1‰,indicating that the optimal dosage of nano-Fe₃O₄ is 2‰.(3)by conducting joint electroosmosis stack preloading consolidation test,compare the electroosmosis consolidation test,stack preloading combined electroosmosis consolidation test,stack preloading joint electroosmosis consolidation test(adding 3‰nano Si O₂ nano Fe₃O₄ or 2‰)as a result,it is concluded that when adding 3‰of nano-Si O₂ stack preloading joint electroosmosis method for soil consolidation effect is best.(4)After electroosmosis,the anode soil sample is imaged by SEM.From the microscopic perspective,it can be seen that nanoparticles can form aggregates during electroosmosis and fill the small gaps between the soil,which is conducive to improving the compactness of the soil after electroosmosis.(5)Based on the microstructure and macroscopic characteristics of soil samples in different electroosmosis test groups,it was concluded that the addition of 3‰nano-Si O₂combined with preloading could promote the electroosmosis best,and the soil strength and compactness after electroosmosis were the best,and the soil had smaller cracks and flat surface.The optimum mixing amount of nanomaterials was obtained through the test results,and the promoting effect of nanomaterials and combined nanomaterials on electroosmosis was studied,so as to improve the efficiency of electroosmosis strengthening of soft soil,and provide reference for the promotion and application of electroosmosis method in practical engineering.