摘要
土工席垫是尾矿坝常用的一种土工合成材料,具有优越的排水性能和较强的水平加筋作用。结合某高尾矿坝工程,采用饱和渗流有限元法分析了尾矿坝土工席垫的渗流控制效果,并应用强度折减法分析了坝坡的稳定性及土工席垫的增稳机制。结果表明:土工席垫的排渗及加筋作用共同提高了尾矿坝边坡的稳定性,且排渗作用占主导;正常蓄水位下,当土工席垫正常工作时,排渗效果显著,可有效降低坝体浸润线(最大17.57m),提高坝坡稳定性(安全系数提高28.0%);当其完全淤堵时,浸润线埋深较浅,但其加筋作用促使坝坡滑动由深部的圆弧滑动转为坝坡表层滑动,仍可使安全系数提高7.6%。设计时可综合考虑土工席垫的排渗及加筋作用对尾矿坝坝坡稳定性的影响,其加筋作用可以作为尾矿坝坝坡稳定安全评价的安全储备。
Geomat is a geosynthetic material commonly used in tailings dam,which had excellent drainage performance and strong horizontal reinforcement.Combined with a high tailings dam project,the seepage control effect of the geomat of the tailings dam was analyzed by saturated seepage Finite Element Method,and the stability of the dam slope and the stabilizing mechanism of the geomat were analyzed by strength reduction method.The results show that,the stability of the tailings dam slope is improved by the water seepage drainage and reinforcement of the geomat,and the effect of water seepage drainage is dominant.Under the normal water level,when the geomat is working normally,the effect of the dropping dam saturation line(maximum 17.57 m)is significant,which can improve the stability of the dam slope(safety coefficient increases by 28.0%).When the geomat is completely silted up,the saturation line is buried shallow,but the reinforcement effect makes the dam slope slide change from the deep circular slide to the surface slide,and the safety factor can still be increased by 7.6%.The influence of the seepage drainage of the geomat and reinforcement on the slope stability of tailings dam can be considered comprehensively in the design.The reinforcement effect can be used as the emergency capacity for the slope stability evaluation of tailings dam.
作者
林杰
沈振中
满健铭
李舸航
LIN Jie;SHEN Zhenzhong;MAN Jianming;LI Gehang(College of Water Conservancy and Hydropower,Hohai University,Nanjing,Jiangsu 210098,China)
出处
《矿业研究与开发》
CAS
北大核心
2020年第11期28-32,共5页
Mining Research and Development
基金
国家自然科学基金/雅砻江联合基金项目(U1765205)。
关键词
土工席垫
尾矿坝
强度折减法
渗流
边坡稳定
Geomat
Tailings dam
Strength reduction method
Seepage
Slope stability
