Experimental Study On Improved Electro-osmotic Consolidation Of Soft Clay

During the process of reinforcement of the soft clay with high moisture content and lowpermeability by electro-osmosis, it can achieve efficient, rapid drainage consolidation. Therefore,electro-osmosis is a more promising foundation treatment method. However, it also faces theproblem of the electrode corrosion, resistance increases, energy consumption during the process ofelectro-osmosis. Therefore, it is necessary to do further research on reinforcement mechanism andthe combination with other strengthening methods of electro-osmosis.Under the equipotential premise gradient, anode follow-up technical is proposed in theelectro-osmosis reinforcement of soft clay foundation, eight electro-osmosis contrast test isconducted through the indoor test. Current, shear strength, displacement, moisture content, pH,conductivity of the soil and other indicators is monitored in the electro-osmosis test of differentprogram of the anode follow-up, the different electro-osmotic reinforcement effect was alsoanalyzed. The results show that anode follow-up can promote the electro-osmosis reinforcementeffect effectively and the operation methods about how to do anode follow-up is obtained.Laboratory test research is carried out on the combined application with electro-osmosis andexternal load, the impact of external load and voltage which is to the electro-osmosis was explored,trying to establish corresponding contact with the external load and the voltage. Based on thisconcept,9-group comparison test is designed, including variable voltage, variable loads andconsolidation tests. Current, the soil flow; moisture content, displacement, pH, conductivity of thesoil and other indicators is monitored in the electro-osmosis test of different program. The impact ofexternal load and voltage on electro-osmosis is obtained, the corresponding contact with theexternal load and the voltage is also established.Laboratory test research is carried out on the combined application with electro-osmosis andlow-energy dynamic compaction, Separate electro-osmosis test and combined application test weredesigned. Current, the soil flow; moisture content, pH, conductivity of the soil and other indicatorsis monitored in the electro-osmosis test of different program. The impact of low-energy dynamic onelectro-osmosis was proposed, the general principles on how to select dynamic compactionparameters were also obtained.Study the reinforcement of soft clay foundation of the combined application withelectro-osmosis and closed vacuum preloading by indoor model test, inserted the metal electrodeadjacent to the position of plastic drain board directly, arranged metal electrodes and the plasticdrain board in a row to play the common role of electro-osmosis cathode, to carry out thecomparative study of the effects of vacuum preloading-electro-osmosis and vacuum preloadingalone. Conduct the real-time measurement of the vacuum under the membrane and the plasticdrainage board, the soil flow changes, current intensity, potential changes in the process of the test.After the test, do the measuring test of the soil surface subsidence, vane shear strength, moisturecontent, soil pH, soil conductivity of the different parts of the soil. The test results show that thetreatment effect of the combined application of vacuum preloading and electro-osmosis is betterthan the effect of vacuum preloading alone. Apart from this, the variation about the degree ofvacuum in the process of vacuum preloading is proposed.This work enriches the research on reinforcement mechanism and the combination with otherstrengthening methods of electro-osmosis.