弹塑性极限平衡法分析复杂岩质边坡的稳定性

笔者采用弹塑性极限平衡法来研究分析复杂岩质边坡的稳定性 ,即以塑性极限理论为基础 ,应用逐渐降低材料强度来逼近系统的极限平衡 ,并以屈服区的贯通来表征系统的极限平衡状态。此时 ,系统达到临界平衡状态时所对应的材料强度降低倍数即为整体最小安全系数 ,临界平衡状态定义为边坡内的塑性屈服区能够形成潜在的滑移通道时的状态。以城门山露天矿南帮边坡为研究对象 ,通过自行改编的NCAP -FS程序进行了数值分析 ,结果表明 ,南帮边坡现阶段是安全稳定的 ,与现场观测结果一致。

Elasto-Plastic Limit Equilibrium Method for Stability Analysis of Complex Rock Slope

Elasto-Plastic limit equilibrium was adopted to analyze the stability of complex rock slope. Based on the limit theory of plasticity, an elastic limit equilibrium method was presented for stability analysis of complex rock slope. The limit equilibrium state of a system was defined as the state in which the yielding zone of the system ran through the rock slope, and approximated step by step with decrement of material strength. The minimum safety coefficient was defined as the reduction coefficient, when the system was fairly close to the limit equilibrium state through decrement of material strength step by step. The south slope of Chengmenshan open-pit was studied. NCAP-FS program was adopted to evaluate the stability of the slope. The results from the calculation analysis showed that the south slope is safe and stable, and complies with the result observed on-site.