双折线形体变控制的三轴试验研究

Experimental study of triaxial test controlled by double fold linear volumetric strain

通过控制最大排水体变的双折线形应变路径三轴试验,研究了控制排水条件对抗剪强度的影响。试验结果表明双折线形应变路径加载条件下,土体的峰值抗剪强度仅与受剪土样的最大排水体变相关,两者近似呈线性关系;在双折线形应变路径试验剪切全程中,试样都不会达到临界状态;体变与剪应变对于试样的剪切特性影响与剪应变水平有关。

The study on the effect of drainage conditions on clay strength was carried out with double fold linear strain path triaxial test controlled by maximum drainage volumetric strain. The results show that under the condition of double fold linear strain path,the peak shear strength is merely linear to the maximum drainage volumetric strain of soil. In the whole test the sample does not reach the critical state. The effect of volumetric strain and shear strain on shear characteristic are related to shear strength level.