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针对顺层岩质边坡岩层结构面倾角θ和边坡角α两个参数,采用离散单元法研究了不同工况下总计270个边坡模型的变形破坏特征,统计得到不同变形破坏模式对应的岩层结构面倾角θ与边坡角α的范围,并基于强度折减法研究了两个参数与边坡稳定性的关系,揭示了顺层岩质边坡变形破坏机制及稳定性特征.研究结果表明:依据边坡变形破坏特征,提出了四种顺层岩质边坡变形破坏模式,即坡脚沿岩层结构面的滑移-剪切破坏,坡顶沿岩层结构面的滑动-剪切破坏,岩层下缘弯曲-剪切破坏,以及岩层上缘翻折-拉裂破坏.在此基础上,分析并归纳了这四种模式的产状、变形特征以及可能的破坏模式等一般规律.边坡安全系数fs随结构面倾角θ的增大先减小后增大,在减小过程中达到最小值后迅速上升,然后变缓回落.边坡安全系数fs随结构面倾角θ变化过程中,当θ约等于α-7.3°时,fs取得最小值,此时对应的边坡稳定性最差.
According to the two parameters of slope angle θ and slope angle α of rock mass slope, the deformation and failure characteristics of a total of 270 slope models under different operating conditions were studied by discrete element method. The corresponding deformation failure modes corresponding to different deformation failure modes The relationship between the two parameters and the slope stability is studied based on the strength reduction method and the deformation and failure mechanism and stability characteristics of the bedding rock slope are revealed.The results show that : According to the deformation and failure characteristics of the slope, four kinds of deformation and failure modes of bedding rock slope are proposed, that is, the slip-shear failure of the slope foot along the rock face, the sliding-shear failure of the slope top along the rock face, The bending and shear failure of the lower edge of the rock formation, and the folding-uplift failure of the upper edge of the rock formation.On the basis of this, the general laws of occurrence, deformation and possible failure modes of the four modes are analyzed and summarized. The safety factor fs firstly decreases and then increases with the increase of the inclination angle θ of the structural plane, then rises rapidly when it reaches the minimum value in the decreasing process and then decreases slowly. During the change of the slope safety factor fs with the inclination angle θ of the structural plane, θ is approximately equal to α-7.3 °, fs Have a minimum value, the worst case corresponding to slope stability.