Study Of Remolded Loess Moisture Migratio Under The Action Of Electric Potential

The strength,deformation and stability of the loess are closely related to the water content.Through the field investigation,the upright slope of 10 ~ 20 m on the loess highland is everywhere,and the soil moisture content is between 6 ~ 10 %.According to the geological analogy method,if a method can reduce the loess foundation pit,tunnel and other projects near the surface of the soil moisture conten,it to increase the stability of the project is great advantage,but also it can be near the surface of the soil as a support structure.The discovery of the chargeability of clay particles and the research and application of electroosmosis in geotechnical engineering have been for a long time,but it is feasible to use the electroosmosis method for the moisture migration of loess to solve the problem of engineering geological in loess area,there is still a lack of reference literature.Based on this,this paper chooses Xi'an remolded loess to study the electroosmosis experimental.Through the self-made experimental device,it is studied whether the potential effect can cause the moisture migration in the loess,and the influences of density,saturation,electroosmotic potential and electroosmotic time on the electroosmotic effect are analyzed.The results show that the potential effect can cause the moisture in the loess to migrate from the anode to the cathode.There is no liquid water discharge at the cathode during the unsaturated loess electroosmosis,but there is liquid water discharge at the cathode during saturated loess electroosmosis,and the discharge capacity increases with the prolongation of electroosmotic time.Increasing the electroosmotic potential and extending the electroosmotic time can further reduce the moisture content of the anode area,but increasing the electroosmotic potential can reduce the increase of the moisture content of the cathode area,and extending the electroosmotic time increases the amount of moisture content in the cathode area.The lower the initial moisture content of the soil caused by the difference of saturation or dry density,the more the moisture content of the anode is reduced under the action of electric potential,and the distribution gradient of the moisture content of the anode area is larger.The phenomena,current,potential,soil resistance and interface resistance of the unsaturated loess electroosmosis experimental are analyzed.The results show that the soil of the anode area is consolidated due to water loss,and the strength is greatly improved,which leads to the fact that the potential stylus of the anode area is difficult to be pulled up after the test,Sometimes it will be pulled out.When the test voltage is constant,the current gradually decreases during electroosmosis.During the test,the potential in the soil is approximately linearly distributed,and the potential distribution gradient on the cathode side is slightly larger than that on the anode side.The distribution gradient of the potential increases with the increase of the electroosmotic potential.As the electroosmotic time is prolonged,The potential drop of the anode increases,but the potential drop of the cathode decreases.The potential drop of the anode and cathode increases with the increase of the electroosmotic potential,but it decreases with the increase of the initial moisture content.As the electroosmotic time is prolonged,the interface resistance of the anode and the resistance of the soil increases,but the interface resistance of the cathode decreases.The initial interface resistance of the anode and cathode and the initial resistance of the soil decrease with the increase of the electroosmotic potential.