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利用三轴循环加载设备对石灰改良粉质路基土进行重复加载,研究其永久变形特性。分析了循环累积应变与循环次数、围压、频率的关系。分析结果表明:路基土累积应变随应力水平和循环周数的增加而增加;累积应变的增长速率随应力水平的增大而增大,随应力水平的减小而减小;当应力水平高于临界值时,土体强度随循环周次的增加而软化、破坏。
The lime-modified silty subsoil was repeatedly loaded with three-axis cyclic loading equipment to study its permanent deformation characteristics. The relationship between cumulative strain and cycle number, confining pressure and frequency was analyzed. The results show that the cumulative strain of subgrade soil increases with the increase of stress level and cycle number. The cumulative strain increases with the increase of stress level and decreases with the decrease of stress level. When the stress level is higher than When the critical value, soil strength increases with the cycle of weeks to soften and destroy.