为探究沉积方向对各向异性结构性砂土力学特性的影响,首先采用椭圆颗粒生成两种不同沉积方向(水平与竖直)的各向异性净砂样,其次,引入一个考虑胶结厚度影响的微观胶接触模型从而生成各向异性结构性砂土。最后,对两种各向异性结构性砂土试样进行双轴压缩试验,并将水平沉积试样试验结果与室内试验结果对比验证该模型的可行性。同时,将两种不同方向试样的试验结果进行对比以探究沉积方向的影响。结果表明:两种试样应力–应变关系均呈软化及剪胀现象,水平沉积试样峰值偏应力较竖直沉积试样大,而二者残余阶段偏应力无明显差别;水平沉积试样临界孔隙比较竖直沉积试样大;胶结破坏速率及胶结破坏率变化与宏观力学特性变化相对应,且变化规律基本相同;水平方向沉积试样的胶结接触主方向始终保持竖直而竖直沉积试样的胶结接触主方向始终保持水平;在水平沉积试样中始终为水平分布颗粒长轴分布主方向,而竖直沉积试样中颗粒长轴逐渐向各向同性分布靠近。 In order to explore the effect of deposition direction on the mechanical properties of anisotropic structural sand, two types of anisotropic sand samples with different deposition directions (horizontal and vertical) were first produced by using elliptical particles. Secondly, an influence of cemented thickness Micro-plastic contact model to generate anisotropic structural sand. Finally, the biaxial compression tests of two anisotropic structural sand samples were carried out, and the feasibility of the model was verified by comparing the results of horizontal deposition test with those of in-house test. At the same time, the test results of two different direction samples are compared to explore the influence of deposition direction. The results show that the stress-strain relationship of the two samples shows the phenomenon of softening and dilatancy. The peak deviatoric stress of the horizontal sedimentary sample is larger than that of the vertical sedimentary sample, but there is no significant difference between the residual stress of the two samples. The pore size is larger than that of the vertically deposited samples. The changes of the rate of cementation failure and the rate of cementation failure correspond to the change of macroscopic mechanical properties, and the variation regularities are basically the same. The horizontal direction of the cemented contact of the sample deposited is always vertical and vertical The main direction of the cemented contact is always horizontal. In the horizontal sedimentary sample, the main direction of the horizontal distribution of the long axis of the particles is always distributed, while the long axis of the vertically deposited sample is gradually distributed toward the isotropic distribution.