变形场和渗流场耦合作用下的尾矿坝静力稳定性分析

对尾矿坝稳定性分析中的几种方法进行了对比,建立了能考虑塑性变形、温度、饱和度和孔隙比等对材料特性影响、土?水特性曲线并采用扩展的Mohr-Coulomb屈服准则、以屈服接近度为安全指标的尾矿坝流固耦合有限元分析模型,对龙都尾矿坝干滩面为100 m和初期坝堵塞两种工况下的饱和-非饱和渗透场和变形场的耦合响应特性进行了模拟,获得坝体变形、浸润线等重要指标,以及考虑各种影响因素的屈服接近度分布,据此可直观全面地了解不同工况下坝体安全的全场信息,对尾矿坝的稳定性分析评价以及加固与维护决策具有一定的参考价值。

Analysis of the Static Stability of Tailings Dam under Coupled Deformation and Seepage Fields

The static stability of a tailings dam is analyzed with a finite element approach,which takes into account the effect of plastic deformation,temperature,saturation and void ratio on the properties of soil materials,the effect of water and soil interaction and the extended Mohr-Coulomb failure criterion.The concept of yield ap-proaching degree is introduced,which is defined as the ratio of the existing equivalent stress to the yield stress taking into account the effects of different influencing factors.The response of the tailing dam subjected to the coupled saturated/unsaturated seepage and deformation is simulated,considering that the dry beach is 100-me-ter long and the starter dam is jammed,respectively.The important indexes such as the deformation and the phreatic surface of the dam are obtained.The distribution of the yield approaching degree in the whole dam un-der the given condition is obtained,which can provide not only a general stability assessment of the dam,but al-so important information to the decision-making for the reinforcement and maintenance of the dam.