Freezing-thawing (F-T) processes can affect the slope instability of open pit mine wall in cold regions, resulting the increase of mining operations cost and decrease the safety of personnel and equipment. Therefore, estimating the degradation of rockmass geomechanical properties under the weathering agent is crucial for slope stability analysis of an open pit mine in mountain areas. Accordingly, for optimal slope stability analysis of Angouran open-pit mine in this research, variations of physico-mechanical properties of pit wall schist rock including dry density, and uniaxial and triaxial compressive strengths were firstly measured during the defined F-T cycles. Then, the related properties of slope rock mass were determined using the generalized Hoek-Brown criterion. Based on the estimated rock mass characteristics, a numerical model of mine slope was constructed and pit stability conditions was analyzed. According to the obtained results, the displacement of slope rock mass varied from 0 to 14.6 m, occurred in highly weathered schist, indicating the low probability of large collapses. To validate the achieved results, 30 prisms were installed in the north-west wall of mine and in-situ displacements were recorded three times in week for one year. Results indicated that the measured displacements from in-situ monitoring and numerical model are in good agreement, so that the determination coefficient (R) was obtained 0.80.

中文翻译：

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考虑风化剂的露天矿边坡稳定性分析：现场、实验室和数值研究

冻融过程会影响寒冷地区露天矿井壁边坡失稳，导致采矿作业成本增加、人员和设备安全降低。因此，估算风化剂作用下岩体地质力学性能的退化对于山区露天矿边坡稳定性分析至关重要。因此，为了在本研究中对 Angouran 露天矿进行最佳边坡稳定性分析，首先在定义的 FT 循环期间测量矿坑壁片岩的物理力学性质的变化，包括干密度以及单轴和三轴抗压强度。然后，利用广义Hoek-Brown准则确定边坡岩体的相关性质。根据估计的岩体特征，构建了矿井边坡数值模型并分析了矿坑稳定性条件。根据所得结果，边坡岩体位移范围为0～14.6 m，发生在强风化片岩中，发生大崩塌的可能性较低。为了验证所取得的成果，在矿井西北壁安装了 30 个棱镜，并在一年内每周记录 3 次原位位移。结果表明，现场监测实测位移与数值模型吻合较好，确定系数R为0.80。