黏性地基土非饱和SWCC试验研究

摘要

针对合肥地区某非饱和黏性铁路地基土,利用非饱和土压力板仪进行考虑干密度和初始含水率的非饱和SWCC试验,结合Van Genuchten模型分析干密度和初始含水率对非饱和SWCC参数的影响特性.研究结果表明:随干密度的增大,非饱和土SWCC中反映的空气进气值会增大,而孔隙尺寸反映参数会变小;随初始含水率的增大,非饱和土SWCC中反映的空气进气值会减小,而孔隙尺寸反映参数会变大.%For the unsaturated soil of one railway foundation in Hefei area, the SWCC tests were conducted with consideration of the dry density and initial moisture content by using the unsaturated soil pressure plate apparatus. For the tests, the Van Genuchten model was used for analyzing the influence of dry density and initial moisture content on the SWCC parameters. The results showed that, the air entry value reflected by the SWCC would increase with increasing dry density, but with reduced pore size. With the increase in initial moisture content, the air entry value reflected by the SWCC decreases, but the pore size increases.