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运用80t三维多功能土工试验机对粗粒土与结构接触面在一定初始静剪应力下的三维单调力学特性进行了试验研究。结果表明:接触面在不同剪切方向下均先剪缩后剪胀,剪胀主要在加载后期接触面接近和达到抗剪强度、切向位移较大时产生;接触面切向变形存在非共轴现象,切向位移增量方向随剪切的进行与切向应力逐渐靠近;切向位移间关系基本为直线,且其与初始静剪应力间的夹角和剪切方向角存在良好的数学关系;接触面抗剪强度包线基本为圆形,呈各向同性;剪切方向对接触面剪缩量、体变与切向位移关系、体变与切向应力关系及切向应力-应变关系有较大影响。
80t 3D multi-purpose geotextile testing machine was used to test the three-dimensional monotonic mechanical properties of the coarse grained soil and the structural contact surface under some initial static shear stress. The results show that the contact surface dilates after being sheared and sheared first in different shearing directions. The dilatancy occurs mainly when the contact surface approaches and reaches the shear strength at the later stage of loading, and the tangential displacement is larger. Axial phenomenon, the direction of increment of tangential displacement with shear and tangential stress gradually close; the relationship between the tangential displacement is basically a straight line, and there is a good mathematical relationship between the initial shear stress angle and shear angle The shear strength of the contact surface is basically round and isotropic. The relationship between the shearing direction and the amount of shear, the relationship between body deformation and tangential stress, the relationship between body deformation and tangential stress and the tangential stress-strain Relationship has a greater impact.