中文摘要：

为了评价某西藏露天矿高陡边坡台阶在极端恶劣条件下的稳定性，采用SLIDE软件建立了矿区边坡台阶的计算模型，同时加栽地震载荷与暴雨荷载，分别计算岩质双台阶和三台不同结构面组合时的安全系数。结果显示，软弱结构面贯穿的台阶越多，所在台阶整体安全性就越差；作用在台阶上的荷栽越多，安全系数越小；多台阶安全系数与软弱结构面面积有关，结构面积越大，台阶安全系数越小，滑坡的可能性越大；台阶安全性与软弱结构面的个数无直接关系。建议加强对边坡监测，同时对于结构面发育的地区采用挂网喷射混凝土处理，防止大气降水和风化冻融影响的劣化。

英文摘要：

In order to evaluate the stability of high and steep slope under extreme conditions in an open pit of Tibet, calculation models of slope steps were established by SLIDE software. Meanwhile, safety factors of rocky double steps and three steps with different structural planes were respectively calculated under rainstorm load and earthquake load. The results showed that the more steps crossed the weak structural plane, the worse safety of step was. The higher load worked in steps, the smaller safety factor of step was. The safety factor of multi steps related to the area of weak structural plane. The larger area of structural plane was, the smaller safety factor was and the more possibility of land- SLIDE was. Besides, there was no direct relation between safety factor and the number of weak structure plane. It advised that the slope monitoring should be strengthened. At the same time, net and shotcreting process was used to dispose the area with developed structural plane, which can prevent the degradation of atmospheric precipitation and weathering freeze-thaw effect.