规则锯齿形节理在剪切荷载作用下的参数分析

Parametric Analysis of Regular Dentate Joints under Shear Loading

采用类岩石材料水泥砂浆,制备3种起伏角度的规则锯齿形节理试样,对各起伏角度的试件进行5种法向应力下的剪切试验得到试验曲线,分析节理剪切应力-剪切位移、法向位移-剪切位移曲线和节理破坏的特征机理;根据Coulumb-Mohr准则对不同起伏角下的剪切强度与法向强度进行拟合,得出黏聚力、摩擦角均较初始值均有大幅度提高,且剪胀角与节理面起伏角为正相关。

Joint specimens with three asperity angles were prepared by using cement mortar.A series of shear tests at five normal stresses on the joint specimens were conducted,from which the shear deformation characteristics and mechanism were analyzed in such aspects as shear stress-shear displacement curve and normal displacement-shear displacement.According to the Coulumb-Mohr guideline,the shear stress and normal stress were fitted at different asperity angles.It was concluded that the cohesion and friction angles are higher than the initial value.And the dilatancy angle is positively correlated with the asperity angle.