软弱夹层作为一种典型地质结构是影响整个边坡安全稳定性的关键因素。为了更好地分析软弱夹层的性质及对边坡稳定性的影响，针对某含软弱夹层矿山露天岩质边坡，运用正交对照法对边坡软弱夹层的埋深、倾角、数量及夹层间结构面间距等4种夹层赋存状态，进行变量4×4正交模拟，揭示了不同赋存状态下边坡稳定性及变形规律。研究结果表明：①边坡软弱夹层的赋存状态对边坡稳定性有显著影响，随软弱夹层的埋藏深度的增加边坡安全系数随之增大，当埋深达到一定后边坡安全系数趋于稳定；②随着软弱夹层角度的增大，破坏机制表现为层间错动、顺层蠕滑和沿软弱结构面的剪切滑移递进式变化；③随软弱夹层层数增多，边坡整体性下降致使变形不均匀，边坡安全系数减小，水平方向位移增大；④对比同等埋深结构面间距较小的软弱夹层边坡，结构面间距对边坡安全系数的影响较小。

As a typical geological structure, soft interlayer is a key factor affecting the safety and stability of the entire slope. In order to better analyze the properties of soft interlayers and their influence on slope stability, for a mine open-pit rock slope with soft interlayer, the orthogonal control method was used to simulate the four occurrence states of the sandwich depth, inclination angle, quantity and structural surface spacing between the layers of the slope soft interlayer, and the stability and deformation law of the slope were revealed under different occurrence states.The results show that: (1) The occurrence state of the soft and weak interlayer of the slope has a significant impact on the stability of the slope, and the safety factor of the slope increases with the increase of the burial depth of the soft interlayer, and the safety factor of the slope tends to be stable after the burial depth reaches a certain level. (2) With the increase of the angle of the soft interlayer, the failure mechanism is manifested as interlayer mismotion, creep slip along the layer and progressive change of shear-slip along the soft structural surface; (3) With the increase of the number of soft interlayer layers, the overall decline of the slope leads to uneven deformation, the safety factor of the slope decreases, and the horizontal displacement increases; (4) Compared with the soft sandwich slope with the same buried depth structural surface spacing is small, the structural surface spacing has less influence on the slope safety factor.

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国家自然科学基金项目（面上项目，重点项目，重大项目）；国家磷资源开发利用工程技术研究中心开放基金