富家坞尾矿初期坝坝体稳定性分析及其灾害防治研究

Research on dam stability and disaster prevention of initial dam for Fujiawu tailings dam

尾矿初期坝的安全运行是保证尾矿库稳定的前提条件。针对富家坞尾矿初期坝局部已出现喷射状渗流并伴有尾矿外泄现象,基于现场调查,分析了尾矿初期坝坝体的组成结构、开展了不同工况下的坝体稳定性研究,并探讨了坝体的灾害防治措施。研究结果表明:尾矿初期坝坝体上部碎石含量少,岩土体强度较高,但其漏水现象较明显;而其下部块石堆砌杂乱,岩土体强度相对较低;针对尾矿初期坝坝体建造质量差,部分已出现贯穿性渗流的坝体宜采用注浆方式进行加固,但其注浆压力不宜超过0.2 MPa。研究成果能为富家坞尾矿库的灾害防治提供理论依据。

The safety operation of tailings initial dam is the necessary condition to ensure that the tailings dam is steady. In view of the appearing of jet shape seepage with the tailings leakage in the local Fujiawu tailings initial dam,on the basis of field investigation,the composition structure of tailings initial dam was analyzed,the study of dam stability under different working conditions was carried out,and the disaster prevention measures of dam were discussed. The results showed that in the upper dam body of tailings initial dam,the gravel content was little and the strength of rock- soil body was higher,but the water leakage phenomenon was obvious. However,the rubble was disorderly stacked and the strength of rock- soil body was relatively lower in the bottom dam body. Aiming at the tailings initial dam with poor quality of construction and the penetrating seepage appearing in partial dam body,the grouting way should be adopted to reinforce the dam,but the grouting pressure should be not more than 0. 2MPa. The results can provide the theory basis for the disaster prevention and control of Fujiawu tailings reservoir.