硅质板岩剪切蠕变特性及边坡变形机理研究

Shear Creep Characteristics and Slope Deformation Mechanism of Siliceous Slate

为研究硅质板岩的时效蠕变效应和高边坡变形破坏演化规律,该文采用室内岩体剪切蠕变试验,通过绘制不同法向应力下硅质板岩的剪切蠕变历时曲线、剪切位移‒时间曲线和不同法向荷载及剪切荷载下蠕变速率‒时间曲线,研究了硅质板岩平均蠕变速率与剪切荷载变化规律,并采用稳态蠕变速率法确定了硅质板岩长期抗剪强度参数。研究表明:蠕变试验中,黏聚力敏感度高于内摩擦角;以十堰至巫溪高速公路ZK33+450硅质板岩高边坡为例,基于摩尔‒库仑模型采用有限差分法对该典型硅质板岩高边坡剪切蠕变条件下的变形破坏机制进行了研究分析。

To study the time-dependent creep effect of siliceous slate and the deformation and failure evolution law of high slope,in this paper,the shear creep test of indoor rock mass was carried out to plot the shear creep duration curves of siliceous slate under different normal stresses,the shear displacement-time curve,and the creep rate-time curve under different normal loads and shear loads.The average creep rate and shear load variation of siliceous slate were studied,and the long-term shear strength parameters of siliceous slate were determined by the steady-state creep rate method.The results show that in the creep test,the sensitivity of cohesion is significantly greater than that of internal friction angle.Finally,the high slope of ZK33+450 siliceous slate on the Shiyan-Wuxi Expressway is used.Based on the Mohr-Coulomb model,the finite difference method was used to analyze the deformation and failure mechanism of the high slope of the typical siliceous slate under shear creep conditions.