Analysis of Seepage Field in Multistage Tailing Dams Area based on Drainage System

作者：Lu Ruili; Wei Wei^*; Sun Dongpo

来源：Research Journal of Chemistry and Environment, 2013, 17(7): 73-81.

• Tailings pond
• multistage dam
• numerical simulation
• original element
• combined drainage system
• seepage gradient

In order to study seepage properties in areas of tailing pond, we simulated the integrated drainage system composed numerically by constructing a specific FEM element mesh (substructure) and generalizing boundary condition. The inversion values and measured values fit great which indicate reasonable applied model parameters. According to the numerical simulation for seepage in tailing pond, seepage gradient along the flow way changes strongly. Water head in slag accumulation areas changes gently, however, in the initial dam toe the water head falls faster. Drainage facilities will decrease the seepage gradient of dam toe area significantly. @@@ A combined drainage system of drainage pipes and longitude-horizontal blind ditch performs better than a single drainage system. Single horizontal pipe drainage system decreases the seepage gradient by 8.7%-12.6%, while combined drainage system can homogenize the phreatic surface behavior and in addition, it decreases the overall gradient of 8.6% to 26.3% more than only setting the horizontal drainage pipe. The seepage gradient is influenced by size and arrangement of drainage system significantly; in addition, it presents monotone increase relevance with the effective water head of multistage dam. To meet the stability requirement for tailing dam, the drainage system should be arranged to match the height of multistage dam.

• 出版日期2013-7
• 单位武汉大学