Experimental study on synergistic electroosmotic treatment of soft soil with green carbonaceous materials

Soft soil has the characteristics of high water content and low shear strength. Under such geological conditions, the construction of foundation treatment is difficult and the construction period is long. In order to practice the concept of green foundation treatment and improve the effect of electro-osmotic consolidation of soft soil foundation, seven groups of laboratory tests were carried out by self-made model box using the electro-osmotic synergistic consolidation with recyclable carbonaceous materials. During the test, the variation regulations of the current, water discharge, shear strength and other parameters were monitored. At the same time, the microstructure pictures of the soil were obtained by SEM scanning electron microscope. The changes of soil pore characteristics after the reinforcement were analyzed by image processing software PCAS, and the mechanism of consolidated soil was explored from the microscopic point of view. The test results showed that the electro-osmotic drainage effect can be effectively improved by adding recyclable carbon materials, and the composite conductor formed by carbon materials and soil particles could significantly improve the current transport capacity and bearing capacity. Compared with the control group, water discharge increased by 17.28% ~ 79.77 % after adding the recyclable carbon material, and the bearing capacity near the anode increased significantly by about 20 kPa ~ 60 kPa. In addition, the concept of ecological efficiency foundation evaluation factor was presented innovatively, which could correctly evaluate the impact of the optimized electro-osmotic method on the environment, and is inversely proportional to the size of the material.