岩质边坡复杂结构面影响下稳定性的细观机制分析

Micro-mechanism of Slope Stability Analysis of Rock Slopes Considering Complex Discontinuities

岩质边坡稳定性分析是岩土工程中备受关注的问题之一,边坡中节理结构面的存在直接影响了边坡稳定性和破坏模式。针对岩质边坡结构面影响下稳定性问题和不连续破坏特征,文章采用颗粒流离散单元法PFC2D,研究了不同节理条件下岩质边坡稳定性问题,讨论了结构面倾角和间距对边坡滑移的影响规律,结果表明:节理倾角对边坡稳定性影响显著,节理倾角为60°,75°,90°对于边坡稳定性的影响较大,且节理倾角的改变直接导致边坡破坏模式转变;节理间距直接影响边坡破坏模式及范围,节理的间距越小,边坡稳定性滑动范围越大。

Rock slope stability has become a key issue in geotechnical engineering.The existence of discontinuities has a great influence on the slope stability and failure patterns.To investigate the effect of joints on the stability and discontinuous failure pattern,numerical analysis on the slope stability considering different joint geometric conditions is performed using PFC2 D code.The effect of joint dip angles and spacing on failure patterns and displacement is discussed.The results show that joint dip angle affected the slope stability.In the cases of dip angle of 60°,75°and 90°,the failure patterns of the slope is greatly affected.The spacing of joints can affect the failure pattern and region.The size of failure region increases with the decrease of joint spacing.