强降雨下铀尾矿库地下渗流流态及稳定性分析试验研究

为了分析强降雨作用下铀尾矿库地下渗流流态及坝体的渗流稳定性,以中国南方某铀尾矿库为研究对象,结合尾矿坝实际运行情况,根据相似原理建立坝体物理模型,并利用GEO-studio有限元分析软件进行验证和预测。结果表明:在2种降雨量的降水压力作用下,各位移监测点的沉降处于整体下降的趋势;浸润线上升高度并不明显,各水位监测点水位先增大后减小,水位监测点1、点4、点5坝体内部已经出现渗透破坏,水位监测点2、点3未发生渗透破坏;4个位移传感器监测处均出现大幅度的横向位移和沉降,即该铀尾矿坝在2种强降雨条件下的稳定性不能满足要求;数值模拟浸润线略低于物理模型试验,位移数值模拟值与物理模型试验值相近,说明模拟效果良好,有限元模型可用于模拟强降雨条件下铀尾矿坝地下渗流流态及稳定性。

Experimental study on the underground seepage flow pattern and stability of uranium tailings reservoir under heavy rainfall

In order to analyze the underground seepage flow pattern of uranium tailings reservoir and the seepage stability of the dam body under heavy rainfall,this paper takes a uranium tailings reservoir in southern China as the research object,and based on the actual operation of the tailings dam,establishes the physical model of the dam according to the similarity principle,and GEO-studio finite element analysis software is used to verify and predict the results. The results show that the each displacement monitoring point is in a decreasing trend under the precipitation pressure of the two rainfalls;the rising height of the saturation line is not obvious,and the water level of each monitoring point increases first and then decreases. At the water level monitoring points 1,4,and 5 osmotic damage has occurred inside the dam. No osmotic damage occurred at the water level monitoring points 2 and 3. The four displacement gauges showed large lateral displacement and settlement. That is to say the stability of uranium tailings dam cannot meet the requirement under two heavy rainfall conditions;the numerical simulation saturation line is slightly lower than the physical model experiment,numerical simulation value of displacement is close to the experimental value of physical model,indicating that the simulation effect is good and that the finite element model can be used to simulate the underground seepage flow pattern and stability of uranium tailings dam under heavy rainfall.