应力作用下非饱和重塑黏土土水特征曲线研究

利用最新研制的全自动非饱和土固结仪,研究了竖向应力对非饱和重塑黏土土水特征曲线的影响,并采用FX模型,通过最小二乘法对试验结果进行拟合。结果表明,竖向应力越大,试样的空气进入值越大,曲线越平缓,水越难排出,相同吸力下含水率越高。FX模型可以较好的描述本次试验各组试样的土水特征曲线。通过分析拟合参数,提出一个只与竖向应力有关的土水特征曲线经验公式。

Experimental Study of Stress State-dependent SWCC of Remolded Unsaturated Clay

Automatic instruments of unsaturated soil consolidation were used to analyze the influences of vertical stress on SWCC of remolded unsaturated clay .Through least-square method ,FX model was chosen to fit the test data .The re-sults show that the higher the vertical stress ,the flatter the curve with higher air entry value and higher water content un-der the same suction .Through the fit results of SWCC ,it was found that FX model can reflect the ability of water-retain-ment of clay in this study well .Besides ,An empirical formula of SWCC only related with vertical stress has been pro-posed .