研究生论坛稿件“干湿循环下高液限黏土与高液限粉土压缩特性比较研究”

通过分析干湿循环后高液限黏土和高液限粉土的高度、质量和压缩系数等试验结果,比较研究了干湿循环条件下高液限黏土和高液限粉土压缩特性的变化规律,并从机理上对两者的变化规律进行了分析,结果表明高液限黏土和高液限粉土在吸失水的过程中所产生的质量和高度变化规律基本相似,质量变化率和高度的变化都是随着干湿循环次数的增加趋于平稳。两种土的压缩系数的变化规律也较为相近,在第1次干湿循环后压缩系数的增长较为明显,高液限粉土的压缩系数增长率为40%～180%,高液限黏土的压缩系数增长率为60%～120%,但都在3次干湿循环过后趋于稳定,在5次干湿循环过后两种土的压缩系数趋于相等。同时在干湿循环过程中高液限粉土的压缩系数基本上都小于高液限黏土。试验中还发现对于高液限粉土和高液限黏土来说,干湿循环是一个不可逆的过程。

Study on the different compression characteristic of high liquid limit clay and high liquid limit silt on Wetting-drying cycles

The change rules of high liquid limit clay and high liquid limit silt on wetting-drying cycles were compared and analyzed by analyzing the test results of the height,mass and compression coefficient of the two soils.The change rules of high liquid limit clay and high liquid limit silt were also studied from the mechanism aspect.From the research results,it can be found that the change rule of mass and height of high liquid limit clay is similar with that of high liquid limit silt.The rate of mass change and height change tend to smooth with the increase in the number of wet and dry cycles in these two soils.The change rule of compression coefficient is also similar in these two soils.After one wetting-drying cycle,the increase rate of the compression coefficient of high liquid limit silt and high liquid limit clay is between 40%~180% and 40%~180%,respectively.The compression coefficient of these two soil tend to smooth after three wetting-drying cycles.The compression coefficient of these two soil tend to be equal after five wetting-drying cycles.But the compression coefficient of high liquid limit silt is less than that of high liquid limit clay in wetting-drying cycles.It also can be found that the wetting-drying cycle is an irreversible process for the two soils.