砂土与结构接触面粗糙度试验研究

Experimental Study on Roughness of Sand-Concrete Structure Interface

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。

A series of sand-concrete structure shear tests were performed by large direct shear apparatus, and the effect of different roughnesses on mechanical characteristics of interface were studied. It was shown that with the increase of roughness, the initial shear modulus of contact surface becomes higher under the same normal stress and the peak value of shear stress becomes higher too. Under the condition of various roughnesses, the relationship between the shear stress and the shear strain on the interface is nonlinear likely, and the distance between the curves becomes nearer with the increase of the normal stress. Under the condition of the same roughness, the relationship between the normal stress and the shear stress on the interface is linear obviously.