尾矿砂的动模量和阻尼比特性试验研究

尾矿砂的动模量和阻尼比特性对尾矿库的地震反应分析具有重要作用。通过对某中线法铜矿尾矿库的尾粉砂、尾细砂和尾中砂开展共振柱试验，系统地研究了三种尾矿砂的动剪切模量和阻尼比特性，并与相同密实度下的石英标准砂进行比较。试验结果表明：相同围压下，尾粉砂的动剪切模量最小，阻尼比最大；石英砂的动剪切模量最大，阻尼比最小；尾细砂的动剪切模量比尾中砂的略大，阻尼比比尾中砂的略小。此外，还得到了各围压下三种尾矿砂的动模量和阻尼比衰减曲线，回归拟合出了Hardin-Drnevich模型参数。

Experimental Study of Dynamic Shear Modulus and Damping Ratio Characteristics of Tailings Sand

The dynamic shear modulus and damping ratio of tailings sand play an important role in the seismic response analysis of tailings ponds. The dynamic shear modulus and damping ratio characteristics of the three kinds of tailings sand were systematically studied by carrying out resonant column tests on the underflow tailings sand, overflow tailings sand and full tailings sand of a centerline method copper mine tailings pond. And then compare with the quartz standard sand under the same relative density. From the test results, we can know that, under the same confining pressure, the dynamic shear modulus of the overflow tailings sand is the smallest and the damping ratio is the largest , the quartz standard sand has the largest dynamic shear modulus and the smallest damping ratio, and the dynamic shear modulus of underflow tailings is slightly larger than that of full tailings, and the damping ratio is slightly smaller than that of full tailings. In addition, the dynamic modulus and damping ratio attenuation curves of the three kinds of tailings sand under different confining pressures are obtained, and the Hardin-Drnevich model parameters are regression-fitted.