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运用80 t大型三维接触面试验机,对初始静剪应力存在时粗粒土与结构接触面循环力学特性及初始静剪应力大小的影响进行了研究。循环剪切时,接触面沿初始静剪应力方向产生了明显的切向位移,且该位移与正交切向的剪切路程基本呈直线关系,该直线与初始静剪应力的夹角和初始静剪应力水平关系可用二次多项式描述。初始静剪应力大小对接触面抗剪强度、正交切向应力-应变关系形式影响较小,主要影响正交切向应力峰值、接触面剪切体变数值及剪切体变与切向位移关系等。初始静剪应力越大,该方向产生的切向位移越大,其正交切向应力峰值越小,该应力峰值对应的切向位移亦越小,接触面剪切硬化程度越高;初始剪切时接触面剪胀量越大,而后期循环剪切时剪缩量和剪胀量则越小。
The influence of initial static shearing stress on the cyclic mechanical properties and the initial static shear stress on the interface between coarse-grained soil and the structure when the initial static shear stress is applied is studied by using 80 t large three-dimensional contact surface testing machine. During cyclic shear, the contact surface has a significant tangential displacement along the direction of the initial static shear stress, and the displacement has a linear relationship with the orthogonal tangential shear path. The angle and the initial Static shear stress levels can be described by quadratic polynomials. The initial static shear stress has little effect on the contact shear strength and the form of the orthogonal tangential stress-strain relationship, which mainly affects the peak value of the orthogonal tangential stress, the value of the shear body at the contact surface, the shear body deformation and the tangential displacement Relationship and so on. The larger the initial static shearing stress, the larger the tangential displacement produced in this direction. The smaller the orthogonal tangential stress peak, the smaller the tangential displacement corresponding to the stress peak and the higher the shear hardening of the contact surface. The initial shear The larger the dilatancy at the contact surface when cutting, the smaller the amount of shear, shrinkage and dilatation at the later cyclic shear.