无砂混凝土沉井在尾矿坝降水工程中的应用

Application of Caisson with Concrete without Sand in the Dewatering Engineering of Tailing Dam

通过岩土工程勘察,查明了尾矿库坝体的物理力学性能、渗透系数等,进行坝体稳定性分析计算。尾矿库浸润线过高会造成坝体不稳定,导致坝体破坏。无砂混凝土作为沉井井壁,采用有效的沉井施工方法达到设计深度。通过抽水试验和多年降水排渗运行情况,无砂混凝土作为沉井井壁,有良好透水性和反滤层的作用,有效地降低坝体浸润线,增强坝体的稳定性。

Physical and mechanical properties and permeability coefficient of the tailing dam were found out by geo-technical engineering investigation and analysis calculation on darn stability was carried out. High would cause instability. Concrete without sand was taken as the caisson wall and the proper construction method was adopted to reach the designing depth. Pumping test and dewatering discharging operation proved that taking concrete without sand as caisson wall could have good nermeabilitv and filtration function, effectively lower the saturation line and increase stability of the dam.