贯通型单台阶岩体结构面剪切性质及应用

发布时间：2018-01-02 04:32

  本文关键词：贯通型单台阶岩体结构面剪切性质及应用　出处：《中南大学学报(自然科学版)》2016年06期 　论文类型：期刊论文

  更多相关文章： 岩体力学 结构面 剪切变形 剪切强度 颗粒流

【摘要】：利用二维颗粒流(PFC2D)方法模拟研究台阶高长比(H/L)对贯通型单台阶岩体结构面剪切变形及强度影响。研究结果表明:台阶损伤破坏模式可分为压切和张剪破坏2种基本类型,随着H/L增大,压切模式逐渐转化为张剪模式,但其与法向应力基本无关。当台阶张剪损伤破坏时(H/L0.45),受弯矩及剪切力偶合作用,台阶根部易张裂;当台阶压切损伤破坏时(H/L≤0.45),主要受斜向上的剪切力作用而使其尖角剪断,沿剪切面呈现明显的爬坡效应,具剪胀特性。针对实际岩体结构面台阶高长比H/L常较小(压切模式),建立同时考虑结构面爬坡与啃断效应的剪切强度经验公式,并运用于边坡稳定性计算的参数取值。
[Abstract]:Simulation of step height to length ratio (H- / L) by using two-dimensional particle flow PFC2D method. The effect of shear deformation and strength on the structural plane of single step rock mass is studied. The results show that the damage and failure mode of step can be divided into two basic types: compression shear and tensional shear failure. With the increase of H / L, the compression shear mode is gradually transformed into tension-shear mode, but it is independent of normal stress. When the step is damaged by tension-shear damage, H / L _ (0.45) is subjected to the coupling of bending moment and shear force. The root of step is easy to crack; When the step is damaged by compression shear damage, H / L 鈮，

本文编号：1367716