基于吸应力的强度分析

Strength Analysis Based on Suction Stress

土中含水量或孔隙水压力与孔隙气压力变化引起的有效应力可通过吸应力特征曲线表示,与土-水特征曲线相互联系,通过非饱和黄土压力板仪试验结果拟合出吸应力与有效饱和度之间的关系曲线。与直剪试验和三轴剪切试验结果进行对比分析发现,对于非饱和黄土来说,吸应力特征曲线可通过剪切强度试验来确定,从而为压力板仪试验得出的吸应力特征曲线提供参照。

The effective stress part caused by the change of water content or pore water pressure and pore gas pressure in the soil can be represented by suction stress characteristic curve.The suction stress characteristic curve and the soil-water characteristic curve are interrelated.The relationship between the suction stress and the effective saturation fitted by the pressure plate test results is compared with the results of unsaturation and loess pressure plate test.The results of direct shear test and the triaxial shear test are compared.For unsaturation and loess,suction stress characteristic can be determined through shear strength.This provides good reference for the suction stress characteristic curve obtained by the pressure plate test.