Tailings Dam Stability Shortest Path Strength Reduction Limit Analysis
Research on the stability of tailings dam is often achieved through the finite element method with strength reduction.The influence of shear strength parameters(c,φ)of tailings dam stability varies.In this paper,the theory of shortest path strength reduction is introduced to conduct a stability analysis of a large tailings dam in Northeast China.The main conclusions are as follows:1)Approximating the actual unit weight of tailings using Optum G2,stability analysis of tailings dam with shortest path strength reduction under seepage conditions is conducted to obtain the minimum safety factor of the slope and potential failure surfaces.2)During unequal strength reduction,as the reduction ratio increases,the length of the reduction path first decreases and then increases,indicating that the minimum safety factor obtained by the shortest reduction path corresponds to the most unfavorable limit state of the tailings dam.3)The minimum safety factor obtained through the limit analysis of shortest path strength reduction is slightly lower than the results of the Swedish slip circle method and simplified Bishop method,but overall,it is in good agreement.4)With the increase in height of the tailings dam,the minimum safety factor continues to decrease,and the range of potential sliding bodies of the tailings dam increases,with the corresponding sliding surface expanding towards the reservoir.
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