ارزيابي تحكيم خاك ريزدانه رسي به روش الكترواسمز با استفاده از مدل آزمايشگاهي

eva‎luation fine-grained clay soil consolidation by electroosmosis using a laboratory model

زمين شناسي

Clay soil, due to its low permeability an‎d high compressibility, causes long-term settlement an‎d low bearing capacity in projects. Conventional improvement methods are not very efficient in dealing with such soils an‎d the consolidation process is slow. In this study, an attempt has been made to investigate the possibility of using the new electroosmosis technology in the consolidation of fine-grained soils. In this study, the role of the electric field in accelerating drainage, shortening the consolidation time, an‎d changing the mechanical properties of the soil was eva‎luated. For this purpose, clay was collected from the city of Isfahan an‎d its initial characteristics were determined. The samples were compacted with a moisture content higher than the optimal value an‎d after 24 hours of saturation, they were subjected to voltages of 18, 24, 36, an‎d 48 volts for 24 hours. The tests were performed in two modes without a slope an‎d with a hydraulic slope. Also, to investigate the effect of ions, two additional tests of 24 an‎d 36 volts were investigated with calcium chloride solution at concentrations of 0.5 an‎d 1 molar. During the process, the settlement rate, the volume of water output, the electric current, an‎d the changes in the pH of the electrolyte were continuously monitored, an‎d at the end of the compressive-shear strength, the percentage of moisture remaining in the sample an‎d the soil pH were measured. Also, in order to eva‎luate the effect of simultaneous loading, two 24 an‎d 36 V tests were performed using a consolidation meter. The results showed that with increasing voltage, the settlement rate an‎d pore water outflow increased, an‎d the highest settlement was observed at a voltage of 36 V with the application of a hydraulic gradient. Under the same conditions, the compressive an‎d shear resistance increased from the anode to the cathode side an‎d was in line with the changes in soil pH. In addition to these changes in the type of fluid, the concentration of the solution an‎d the hydraulic gradient also affected the mechanical behavior of the soil. However, the combination of mechanical loading an‎d the application of an electric current, in addition to increasing the settlement rate, reduced the moisture content an‎d improved the compaction resistance of the soil. Overall, the observations indicate that electroosmosis effectively plays a role in reducing the settlement time an‎d improving the strength an‎d stability of saturated fine-grained soils.

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