矸石山稳定性非线性极限分析上限法

总结了矸石山几种失稳模式，在分析矸石散体剪切强度非线性机理的基础上，依据塑性极限分析原理，考虑矸石散体抗剪强度的非线性，利用极限分析上限定理针对矸石山内部滑坡进行稳定分析.结果表明，在中低围压下，采用线性强度准则低估了矸石山的稳定性；考虑矸石散体强度非线性可体现随高度增加矸石山稳定性降低的实际状态；当矸石散体黏聚力为零时，由非线性准则可得到合理的临界滑裂面.

Nonlinear plasticity limit analysis upper bound method of gangue hill stability

Summarized several failure patterns of gangue hill and discussed the nonlinear mechanism of gangue shear yield rule.The analysis result shows that the Mohr failure envelopes for gangue exhibit significant nonlinearity particularly in low and medium stresses.The strength of gangue exhibits nonlinearity and the curved failure envelope could be described by exponential relationship.Based on the analysis results and the plastic limit analysis upper bound theorem,the gangue hill stability was analyzed with strength nonlinearity taken in account.Stability(analysis) of gangue hill slope indicates that safety factor of nonlinear analysis is bigger than linear analysis in low and medium stresses.Safety factor based on nonlinear rule vary with gangue hill height,but that of linear analysis is constant.The slip surface of linear analysis is shallow when the cohesion is zero,but that of nonlinear analysis is deep.The calculated outcome of nonlinear rule is more reasonable than that of linear rule.