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利用大型多功能界面剪切仪进行了砂土与结构物的接触面剪切试验,研究了粗糙度对接触面力学性质的影响。试验结果表明:在法向应力不变条件下,随着粗糙度在增加,接触面的初始剪切模量和剪切应力的峰值都相应增大。不同粗糙度条件下,接触面的切向位移和剪切应力都表现出相近的非线性关系,并且随着法向应力的增加,切向位移和剪切应力关系曲线直接的距离越来越小。相同粗糙度条件下,接触面上的法向应力和剪切应力表现出明显的线性关系。
The large-scale multi-functional interfacial shear tester was used to test the contact surface shear of sand and structure, and the influence of roughness on the mechanical properties of the contact surface was studied. The experimental results show that with the increase of roughness, the initial shear modulus and shear stress of the contact surface increase correspondingly under the normal stress. Under different roughness conditions, the tangential displacements and shear stresses of the contact surfaces all show a similar nonlinear relationship, and as the normal stress increases, the direct distance between the tangential and shear stress curves becomes smaller and smaller . Under the same roughness condition, the normal stress and the shear stress on the contact surface show a clear linear relationship.