| The depth of the immersion line is one of the important factors affecting the stability of the tailings pond.This paper takes the Xuejiping tailings pond as the research object.Data such as permeability coefficient and shear strength parameters of tailings were obtained based on Darcy penetration test and consolidated undrained triaxial shear test.Analysis of Stability of The Tailings Pond by Midas GTS NX Software.The following research results were obtained.(1)The effects of different sedimentary methods,different dryland lengths and 24-hour continuous heavy rainfall on stability of tailings pond were analyzed in detail.The research shows that under the three factors,The immersion line at the upper part of the dam slope and the foot of initial dam is relatively shallow,which is prone to seepage damage.Among the influencing factors of different sedimentary methods,considering the characteristics of the granularity of the granules from the initial dam to the sedimentation of the tailings and the thin interbedded structure of the tailings,the immersion depth of the tailings reservoir is the shallowest,and the overall stability coefficient of the tailings pond is the smallest.The minimum safety factor of tailings ponds between different sedimentary methods differs by 0.05.Among the influencing factors of different dry beach lengths,the shorter the dry beach is,the more difficult it is for the stability of the tailings pond.Dry beach length reduced by 50 meters,the saturation line of the pile dam rises by about 6m on average.saturation line of the initial dam rises by about 1.8m on average,and the stability coefficient decreases by about 0.15.After 24 hours of continuous heavy rainfall,after the rainfall,saturation line of the initial dam increased by 3.1 m;saturation line of the accumulation dam rose by 0.46 m.The overall minimum safety factor of the tailings pond differs by 0.159 before and after rainfall.Therefore,among the three factors,the 24-hour continuous heavy rainfall has the most significant effect on the stability of the tailings pond.(2)Among the three different influencing factors,the minimum safety factor of the tailings pond is 1.513 when considering the sedimentary modes of the two sedimentary features;the minimum safety factor of the tailings pond is 1.364 when the length of the drywall is 50m;after 24 hours of continuous heavy rainfall,The minimum safety factor of the tailings pond is 1.354,and the safety factor is the smallest.Therefore,regardless of the above factors,the tailings pond is generally stable,providing a solid foundation for the next expansion of the tailings pond.(3)The simulation of the stability of the 24-hour heavy rainfall in the tailings pond after expansion was carried out.The results show that after expansion,under the condition of 165 m in dry beach,saturation line of the initial dam is shallow before and after rainfall.After the rainfall,the initial dam saturation line increased by 1.347 m on average;saturation line of the pile dam rose 1.20 m on average.Before and after rainfall,the maximum displacement in the X direction is in the front of the tailings expansion,and the maximum displacement is between 23 cm and 28 cm.Before and after rainfall,the maximum shear strain is the initial dam and the front area of the tailings.The front of the tailings may form a potential slip surface extending from the bedrock towards the dam slope.After rainfall,the minimum safety factor is only 1.055,which is slightly higher than the relevant national standards.In order to ensure the absolute safety of the tailings pond,necessary safety measures need to be taken.For example,strengthen drainage and increase the length of dry beach. |
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