It has been shown that wrapping granular soil with geotextile significantly increases its bearing capacity. This finding, recently, has extended the use of soilbags to construct permanent structures. This paper investigates the compressive behavior of a new geo- column called the soilbag column. Several compression tests were performed for both end-bearing and floating columns with different diameters and lengths in a testing tank filled with loose sand. To compare the effectiveness of this method with other common techniques of soil improvement, the compressive behavior of encased sand columns was also studied. In both scenarios, induced additional confining pressure provided by the encasement is the most important factor in increasing the bearing capacity. The results indicated that the soilbag columns provide much stiffer compression behavior than the encased sand columns. Compared to an encased sand column, the superiority of using a soilbag column is more evident for the end-bearing type. The values of bearing capacity of the physically modeled encased sand columns agreed well with the values estimated by an analytical approach using cavity expansion theory. Besides, an analytical approach developed to predict the stress-strain response of the soilbags under the uniaxial compression test.

研究表明，用土工布包裹颗粒状土壤可显着提高其承载力。最近，这一发现扩大了使用土袋建造永久性建筑物的可能性。本文研究了一种称为土袋柱的新型土柱的抗压性能。在装有疏松沙子的测试罐中，对具有不同直径和长度的端承和浮柱进行了多次压缩测试。为了将这种方法与其他常用的土壤改良技术的效果进行比较，还研究了包裹砂柱的抗压性能。在这两种情况下，由外壳提供的额外限制压力是增加承载力的最重要因素。结果表明，土袋立柱提供的压缩行为要比封闭的沙柱高得多。与封闭式砂柱相比，对于端承式，使用土袋柱的优势更加明显。物理建模的包裹砂柱的承载力值与使用空腔扩张理论的分析方法估算的值非常吻合。此外，开发了一种分析方法来预测土袋在单轴压缩试验下的应力应变响应。物理模拟的包裹砂柱的承载力值与通过使用空腔扩张理论的分析方法估算的值非常吻合。此外，开发了一种分析方法来预测土袋在单轴压缩试验下的应力应变响应。物理建模的包裹砂柱的承载力值与使用空腔扩张理论的分析方法估算的值非常吻合。此外，开发了一种分析方法来预测土袋在单轴压缩试验下的应力应变响应。