论文部分内容阅读
尾矿库边坡稳定性多以单一安全系数为评价指标,难以反映外界条件变化的过程中尾矿库边坡稳定性演化的全过程特征。针对这一问题,提出尾矿库稳定性的时变分析方法,以安全系数时程曲线分析尾矿库边坡稳定性。以尾矿库工程实例为研究对象,建立时变分析模型进行数值模拟。研究在不同降雨入渗、库水位变动以及二者耦合条件下边坡安全系数随时间变化的规律。研究结果表明,不同强度的均匀降雨影响下,6 h以后安全系数下降速率大致相当,6 h以内雨强越大,安全系数下降越快。降雨雨型将影响安全系数变化轨迹,研究较为广泛的均匀雨型并不是最危险雨型。边坡安全系数变化滞后于库水位变动,滞后效应随水位上涨速度的减慢、下降速度的加快和涨幅的减少而减弱。耦合条件下尾矿库边坡安全系数减小将加剧。研究成果对尾矿库设计和运营具有重要意义。
The stability of tailings slope often uses single factor of safety as evaluation index and it is difficult to reflect the whole process characteristic of the stability evolution of tailings slope during the change of external conditions. In response to this problem, a time-varying analysis method of stability of tailing ponds is proposed, and the stability of tailings slope is analyzed by time-history curve of safety coefficient. Taking the example of tailings dam project as the research object, a time-varying analysis model is established for numerical simulation. The law of slope safety factor changes with time under different rainfall infiltration, reservoir water level changes and the coupling condition between the two is studied. The results show that under the influence of uniform rainfall with different intensities, the rate of decline of the safety factor after 6 h is roughly equivalent, and the greater the rainfall intensity within 6 h, the faster the safety factor declines. Rainfall type will affect the safety factor change trajectory, the research is more extensive and uniform rain type is not the most dangerous type of rain. The change of slope safety factor lags behind the change of reservoir water level, and the lag effect decreases with the rise of water level, the acceleration of decline and the decrease of increase. Under the coupling condition, the safety margin of tailings slope will be aggravated. The research results are of great significance to the design and operation of tailing ponds.