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上游筑坝法尾矿坝长期处于欠固结状态,密实度较低、结构松散,在频繁的矿山生产爆破地震作用下极易出现液化区,进而导致坝体失稳。针对某矿业公司对矿山生产爆破导致产生的水平地震加速度进行了测试,并将其作为输入地震波,对尾矿坝进行了动力有限元响应分析。分析结果表明,初期坝较后期堆积坝响应强烈,在爆破震动作用下尾矿坝体内没有液化区产生,因此可以认为矿山目前所采用的生产爆破规模不会对坝体稳定性产生不利影响。
The upstream dam construction tailings dam is in a state of under consolidation for a long time, with low density and loose structure. It is apt to appear liquefaction zone under the blasting earthquake of frequent mine production, which leads to instability of the dam body. Aiming at the horizontal seismic acceleration caused by blasting in a mining company, the paper analyzes the seismic acceleration of a mining company and uses it as the input seismic wave to do dynamic finite element analysis of the tailings dam. The analysis results show that the early dam has a strong response to the late dam, and there is no liquefaction zone in the tailings dam under the action of blasting vibration. Therefore, it is considered that the blasting scale currently used in the mine will not adversely affect dam stability.