Justification of slope parameters for benches and pit walls in clayey rock mass bases on studies into geological structure and physical and mechanical properties of rocks of various lithological varieties. The upper layers of pit walls occur in weak clayey overburden, in the crust of weathering and in transition zone with conglomerates, up to 150 m in total thickness. In this case, it is required to calculate accurately angles of clayey slopes, to undertake cutback at recommended angles and to eliminate heavy flow of melt water and rain water from ground surface to the slopes. Mining within the design pit wall limits should be accompanied by continuous instrumental monitoring of pit wall slopes.

中文翻译：

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粘土岩体露天矿边坡稳定性

黏性岩体台阶和坑壁边坡参数的论证基于对各种岩性岩石的地质结构和物理力学性质的研究。坑壁上层出现在弱粘土覆盖层、风化地壳和砾岩过渡带中，总厚度可达150 m。在这种情况下，需要准确计算粘土质斜坡的角度，按推荐的角度进行削坡，并消除融水和雨水从地表向斜坡的大量流动。在设计坑壁限制范围内的开采应伴随着对坑壁斜坡的连续仪器监测。