Centrifuge Model Test on the Consolidation Deformation and Stability of Gentle Up-stream Tailings Pond Slope
Once the tailings dam break accident occurs,it will have a serious impact on human life and properity safety and ecological environment.To examine the consolidation behavior and stability of tailings pond slopes post-closure,centrifuge model tests were conducted under both natural and saturated conditions,based on the Majiatian tailings pond.The pore pressure and soil pressure response laws were obtained by pore pressure and soil pressure sensors,and the deformation image of slope was recorded by high-speed camera.Besides,the consolidation behavior was analyzed using PIV velocity measurement technol-ogy.Test results indicate that under both conditions,the tailings pond slope primarily undergoes consolidation deformation with-out any local or overall instability,except for minor seepage erosion in shallow tailings silt.Specifically,the maximum consolida-tion deformation rate under natural conditions was recorded at 2.11×10-4 m/s,with consolidation completing in 1475 seconds.While the maximum rate of consolidation deformation in saturated conditions reached 1.03×10-4 m/s,taking 2106 seconds to complete.During consolidation deformation,pore pressure decreases due to drainage,and the relative soil pressure varies with water content changes.Overall,soil pressure steadily increases with centrifugal acceleration without sudden stress changes.Ef-fective drainage in tailings ponds is essential to shorten consolidation time and reduce the risk of instability.
tailings pond slopeconsolidation behaviorstabilitydeformation evolution lawcentrifuge model
万方数据
维普
