Rock-like materials and Barton’s standard joint curve were used to make filled joint specimens, and the shear characteristics of the filled joints were studied. Discrete element software was used to analyze the failure mechanism during filled joint shearing. Based on the experimental findings, a new theoretical model of joint shear strength was proposed. It was found that joint roughness has a great effect on filled joint shear failure, which is manifested via three different morphologies. The effects of the filler on the shear stress–strain curve are mainly a higher slope in the elastic phase and a lower slope in the plastic phase. The shear failure of the filled joint starts from local small damage of the filling and then progresses to failure of the bonding surface or the filling itself. Based on the proportion of the joint failure surface area to the joint surface area, a new formula for calculating shear strength is proposed.

用岩石样材料和巴顿标准节理曲线制作实心节点试样，研究实心节点的剪切特性。使用离散元软件分析了填缝剪切过程中的破坏机理。基于实验结果，提出了一种新的抗剪强度理论模型。发现接头粗糙度对填充接头的剪切破坏有很大影响，这通过三种不同的形态表现出来。填料对剪切应力-应变曲线的影响主要是弹性相的较高斜率和塑性相的较低斜率。填充接头的剪切破坏从填充物的局部小损伤开始，然后发展到粘结表面或填充物本身的破坏。