非饱和含黏砂土的广义土-水特征曲线试验研究

Experimental study of generalized SWCC of unsaturated sand and containing clay

利用非饱和土4联固结仪和非饱和三轴仪,解决了用压力板仪测试土-水特征曲线无法考虑体变、净竖向压力和净平均应力影响的问题,进行了考虑净竖向压力和净平均应力影响的土-水特征曲线研究,对未考虑净竖向压力或净平均应力的土-水特征曲线同考虑净竖向压力或净平均应力的广义土-水特征曲线的试验结果得出,净竖向压力或净平均应力是影响非饱和土土-水特征曲线的重要因素,试验结果与理论公式稳合较好,并结合非饱和理论和试验结果,拟合了可以反映净竖向压力或净平均应力影响的广义土-水特征曲线公式,与试验结果吻合较好。

Using four consolidation apparatus and triaxial instrument for unsaturated soils, they have advantages that could measure volume change and take into account effect of net mean stress that pressure plate apparatus could not. A seriers of tests with considering and without considering net normal pressure or net mean stress about generalized SWCC, are carried out. Test studies indicate that net normal pressure or net mean stress plays an important role in the SWCC. The test results are consistent with the theoretical formula. Combining unsaturated soils theories with practices, a formula of generalized SWCC under without considering and considering net normal pressure or net mean stress affect. Test results well agree with theoretical formula.