陕北非饱和黄土应力应变关系的各向异性试验研究

Study on AnisotroPy of Stress-strain Relationships of Unsaturated Loess in Northern Shaanxi

为了研究陕北地区非饱和黄土应力应变关系的各向异性,利用西北农林科技大学的真三轴仪,分别从三个方向单独加荷,进行了5个初始固结状态b=0.1、0.3、0.5、0.7、0.9的固结不排水真三轴试验。试验结果发现:以b=0.3为分界点,无论从哪个方向加荷,在b=0.3之前,随着b值的增大,ε1、ε2、ε3表现为明显的各向异性,在b=0.3之后,ε1、ε2、ε3各向异性程度减弱。

In order to study the anisotropy of the stress and strain relationship of unsaturated loess in northern Shaanxi,the true triaxial instrument of Northwest Agricultural and Forestry University was used to add charge separately from three directions.Five true triaxial tests of consolidation without drainage were performed in the initial consolidation state b=0.1,0.3,0.5,0.7,0.9.As a result,despite the directions to increase major principal stress,b=0.3 is a division:before that,as the b increased,the anisotropy ofε1、ε2 and ε3 was obvious.After that,as the b increased,the anisotropy of ε1、ε2 and ε3 decreased.