Stone columns, which are frequently employed to stabilize the liquefiable soil, are susceptible to accumulation of soil particles. The progressive accumulation of the soil particles causes clogging of the stone column which decreases its drainage capacity. The stone column can be encased with geotextile to sustain its long term drainage function. The encasement prevents the movement of the soil particles into the stone pores. In the present paper, a mathematical model is presented to assess the filtration performance of the geotextile encasement to prevent the clogging. The filtration capacity of the geotextile is related to its maximum pore size, porosity and soil characteristics. It is observed that the encased stone column dissipates the excess pore pressure at a faster rate compared to the stone column without encasement. The peak maximum excess pore water pressure (U_max) is not significantly affected due to selection of the opening size of the geotextiles for single earthquake. However, the opening size can significantly affect the peak U_max value for multiple earthquakes. Depending on the capture coefficient of the stone column, the clogging can be fully prevented for higher hydraulic gradient if geotextile with maximum opening size in between D₁₀ to D₅ is used as encasement.

经常用来稳定可液化土壤的石柱容易积聚土壤颗粒。土壤颗粒的逐渐积累会导致石柱堵塞，从而降低其排水能力。石柱可以用土工布包裹以维持其长期排水功能。包裹物可防止土壤颗粒移动到石孔隙中。在本文中，提出了一个数学模型来评估土工布套的过滤性能，以防止堵塞。土工布的过滤能力与其最大孔径，孔隙率和土壤特性有关。观察到，与没有包裹的石柱相比，包裹的石柱以更快的速率消散了多余的孔隙压力。由于选择了单次地震的土工织物的开口尺寸，因此不会显着影响U _max）。但是，孔的大小会严重影响多次地震的峰值U _max。如果使用最大开口尺寸在D ₁₀到D ₅之间的土工织物作为包裹物，则根据石柱的捕集系数，可以完全防止堵塞，以获得更高的水力坡度。