关键词: 加筋碎石桩, 路堤边坡, 模型试验, 极限荷载, 砂土路堤

Abstract: Geosynthetics-encased stone columns(GESCs), a new type of column, have been widely applied in the field of ground improvement, however, it is rarely used in slope reinforcement or fast slope maintenance. Therefore, comprehensive laboratory model tests under consideration on effects of location, length, number of GESCs as well as GESCs distribution and types of geotextiles on slope reinforcement were carried out. The tests results showed that when single GESC is used in slope reinforcement, the optimum distance of column is 0.6H from slope toe, with length of 0.75H (H, slope height); for equal slope width, increasing GESCs can remarkably increase ultimate bearing capacity of the reinforced slope, for the same number of GESCs, the slope reinforcement effect with stronger geotextiles is more remarkable with higher bearing capacity compared to lower tensile geotextile; for the same size slope, after deformation occurrence under ultimate bearing capacity, the inclination angle between GESCs and vertical direction increases with the length of GESC. Horizontal displacements of slope surface near slope top and slope toe were larger, while smaller horizontal displacement were found at slope surface near the GESC top, which illustrates that geosynthetics-encased stone column can effectively control horizontal displacements around top of GESCs.

Key words: geosynthetics-encased stone column, model test, road embankment slope, ultimate load, sandy road embankment