Seepage Calculation And Seismic Dynamic Response Analysis Of A Tailings Dam

This dissertation states the basic situation of a tailing dam, seepage calculation andearthquake dynamic response analysis of the tailing dam has been done by FLAC2D. Drivenby7degree earthquake motion, data of pore water pressure, acceleration and displacement ofthe tailing dam constructed by upstream method was collected and showed below.1.The numerical simulation analysis of tailing dam seepage field shows: saturation lineof the tailing dam reach the highest in flood level, then the normal water level, and the lowwater level has the lowest saturation line, which indicated lower reservoir water level isbeneficial to reduce saturation line height that helps to improve the stability of the tailingdam.2. Acceleration dynamic response of the tailing dam body shows: acceleration peak valueof tailings dam occurred in the period of strong earthquake (4S~10s). acceleration peakvalue rule of other body positions in this period is: in the downstream slope of the tailingdam,acceleration peak increased initially, and then decreased gradually, in the surface of thedownstream slope, peak acceleration achieves the biggest value; Peak acceleration alsoincreases gradually in longitudinal axis of the tailing dam body and also increase with the damheight, but the variation is small.3. Displacement changing of tailing dam under earthquake action shows that the largestdisplacement is in the upper part of the downstream slope, where is unstable and vulnerable tobe damaged.4. Utilizing grade curve method and relative density method was adopted to thepreliminary liquefaction analysis, which shows that the silty fine sand and silty soil materialsof the tailing dam belongs to the possible liquefied soil layer; When the standard penetrationtest method was used for liquefaction analysis of a tailings dam, it shows that the dam’s tailsilty sand could be liquefied soil layer in the standard penetration depth is less than17.15m,liquefied phenomenon will not happen if the standard penetration depth is more than17.15m(including17.15m); Using pore water pressure numerical simulation analysis of the tailingdam in earthquake process, the pore water pressure grew up obviously in the middle part of the tailings dam, which may causing liquefaction phenomenon.