Centrifugal model tests on composite foundation reinforced by geosynthetic- encased stone columns under embankment loads
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摘要: 进行了2组不同筋材刚度土工织物散体桩复合地基路堤离心模型试验,和1组碎石桩复合地基路堤的对比试验,以研究其在真实应力条件下的性状及稳定性。研究结果表明：随着筋材刚度的增大,地基中的超孔隙水压力略有减小,桩顶和桩间土沉降明显减小,而桩顶和桩间土之间的差异沉降明显增大;桩土应力比随筋材刚度的增大先增长明显,而后趋于缓慢;当筋材刚度较低或上覆荷载很大时,土工织物散体桩可发生显著的弯曲变形而引起较大的沉降,碎石桩则在软土中容易发生鼓胀变形而引起很大的沉降,但两者均未在复合地基中形成剪切滑移的趋势。Abstract: The centrifugal model tests are performed on embankments on composite foundation reinforced by two groups of geosynthetic-encased stone columns (GECs) with different stiffnesses and by a group of ordinary stone columns (OSCs) as a comparison test. The behavior and stability of GECs under actual stress conditions are studied. The results show that an increase in geosynthetic stiffness leads to a little decrease in the excess pore water pressure, apparent decrease in the settlements at the top of the columns and the soils, whereas apparent increase in the differential settlement. The stress concentration ratio increases with an increase in the geosynthetic stiffness, but the rate of increase decreases gradually. When the geosynthetic stiffness is low or embankment load is large, GECs can bend significantly so as to incur apparent settlement, while OSCs are apt to bulge to incur larger settlement. However, there is no tendency of shear sliding in the soils treated by GECs and OSCs.
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