土工织物包裹碎石桩复合地基承载特性模型试验

Research on the Bearing Characteristics of the Composite Foundation Reinforced by Geo-encased Stone Columns

本文通过模型试验对比分析土工织物包裹碎石桩、传统碎石桩复合地基和未加固地基的受力和变形特性,研究包裹碎石桩对软土地基的加固效果。结果表明:包裹碎石桩复合地基的极限承载力较未加固地基和传统碎石桩复合地基提高945.45%和360.00%;桩顶以下3倍桩径深度范围内,包裹碎石桩的径向变形和桩周水平向土压力均显著小于传统碎石桩;土工织物能有效提高包裹碎石桩的整体性和刚度。

Model tests were conducted for the composite foundation improved by the geo-encased stone column,the unreinforced ground,and the conventional gravel pile composite foundation.The mechanical properties and deformation characteristics are discussed in detail.Results show that,comparing with the unreinforced ground and the conventional gravel pile composite foundation,the ultimate bearing capacity of the composite foundation improved by the geo-encased stone column could be enhanced by 945.45% and 360.00%.Within the depth range of 3 times the pile diameter,the radial deformation and the horizontal soil pressure of the geo-encased stone column are smaller than that for the conventional gravel pile.The integrality and stiffness of the pile are improved by the geotextile.