不同前期降雨类型下涩草湖尾矿坝渗流稳定性规律研究

Study on Seepage Stability of Secaohu Tailings Dam under Different Rainfall Types in the Early Stage

为探究不同类型前期降雨下涩草湖尾矿坝的渗流稳定性变化差异较大的问题,利用Geostudio软件对涩草湖尾矿坝进行了数值模拟,得到了不同表层、纵深孔压及安全系数变化规律。结果表明,前期降雨过程中表层孔压不断升高,而在前期降雨接近结束时孔压则逐渐降低或增速减缓,短历时、强降雨下主降雨过程中,孔压有个突然升高的过程;前期降雨条件下,尾矿坝安全系数呈持续下降的规律,在主降雨过程中,安全系数降幅更大,最终安全系数降幅逐渐减小并最终趋于稳定。不同类型前期降雨影响了涩草湖尾矿坝的长期安全稳定性的规律。

For the purpose of exploring the seepage stability law of Secaohu tailings dam under different types of early rainfall,based on the software Geostudio,numerical simulation was carried out to obtain different surface layer,depth pore pressure and safety coefficient.The results show that the surface pore pressure was increasing in the early rainfall process,while the pore pressure gradually decreased or the growth rate slowed down at the end of the early rainfall.In the process of short duration and strong rainfall,the pore pressure appeared a sudden rise process.Under the early rainfall condition,the safety factor of the tailings dam decreases gradually and finally tends to be stabilized.Different types of early rainfall affect the long-term safety and stability of the tailings dam.