Experimental And Theoretic Study On Electroosmosis Chemical Grouting Of Marine Soft Clay

Electroosmosis chemical grouting method is inserted in the soft clay metal electrodes and applying direct current, at the same time at a certain pressure to the electrode into the salt solution, soil produce a series of complicated physical and chemical reaction in the body, including the electroosmosis, electrophoresis, electrolysis, hydrolysis and hydration, redox reaction, ion diffusion, ion exchange and ion precipitation, ion migration, mineral decomposition, electroosmosis and electrolysis, ion exchange and salt precipitation strengthening effect was most pronounced in soft clay.Marine soft clay is widely distributed on the coastal areas in our country, to relieve the strain on coastal city basic construction land, the need of Marine soft clay foundation treatment, make it meet the needs of engineering construction. Marine soft clay is characterized by high water content, high compressibility, low permeability, low shear strength, high salinity and significant structural and rheological property, therefore, of Marine soft clay foundation treatment technology is more complex. At present the main means of Marine soft clay foundation treatment using (vacuum preloading or stack preloading) drainage consolidation method, these methods mainly exist the following problems:(1) the low strength of soil, the reinforced settlement deformation is big, poor uniformity, established engineering also has different degree of engineering quality problems; (2) stack preloading and vacuum preloading drainage consolidation method for a long time, the sedimentation rate is stable, harder for deep soft soil foundation reinforcement effect is not ideal, processing depth is limited, sometimes even difficult to reinforce the purpose desired.Electroosmotic drainage method compared to other traditional methods are fast drainage consolidation, the advantages of small impact on the surrounding environment, the salinity in the Marine soft clay CLP drainage consolidation effect is not ideal, mainly involving high conductivity caused by excessive energy consumption and metal arc (Yang) extremely severe corrosion. And in this paper, we study the electroosmosis chemical grouting method is different from traditional electroosmotic drainage method, this method not only includes the principle of electroosmotic drainage consolidation and strengthening of Marine soft clay, through to the anode made in salt solution, and produces a series of physical and chemical reaction, the reaction changed the soil structure and increase the coupling strength between particles (set), make the strength of the soils increased significantly, however, the mechanism of consolidation is imperfect, the lack of design and calculation method, the high energy consumption for restricted the electroosmosis chemical grouting engineering application, therefore, necessary to carry out the Marine soft clay electrical penetration for the further study of the chemical grouting.According to the above problems, this paper mainly studied the following issues:1, This paper summarizes the electric permeability and electric permeate the development course of chemical grouting method, the research present situation, the actual application in the geotechnical engineering condition and the prospect for its future application. In detail elaborated the electroosmosis chemical grouting mechanism and the influence factors of electroosmosis chemical grouting, this paper expounds the electroosmosis the advantages and disadvantages of chemical grouting.2, According to the test theory, developed by test rig to yingkou coastal industrial base, dalian Marine soft clay PuLanDian donggang district taiping bay port and dalian Marine soft clay as test object, the indoor test, the test process by pumping chemical solution, in the process of test parameters such as current, resistance, power consumption, soil temperature and soil when electricity stopped after different age have to measure the bearing capacity of the various regions, and according to the electrochemical grouting theory, study the reinforcement mechanism of the regional soil and reinforcement scope, according to different age when soil bearing capacity of effectively reduce energy consumption of electrochemical means, and through the test that the essential difference between electrochemical grouting and electroosmotic drainage experiment.3, The anode and cathode of cemented soil samples for chemical analysis and macroscopic observation, the electroosmosis chemical grouting experiment, due to the pumping of the chemical solution, a series of chemical reaction, the reaction changed soil structure and increase the coupling strength between particles (set), cause changes in the chemical composition of soil, increase soil strength.4, According to the laboratory test results, in view of the new campus of dalian ocean university and dalian donggang CBD of Marine soft clay in the field test, fully verify the accuracy of the laboratory test and electrochemical method of grouting reinforcement of Marine soft clay engineering feasibility, provide the certain reference value for practical engineering application.