尾矿库坝体稳定性维护研究

Study on Stability Maintenance of Tailings Dam

某尾矿库3级子坝位于基岩凸出部分附近,上游存在类似水坑的淤泥层,对坝体稳定性造成极大影响,理论上降低浸润线高度或者加固坝体是当前可采取的有效措施。采用了FLAC^(3D) 软件对该尾矿库坝体进行了桩加固的数值模拟,模拟假定了坝体均处于非静水压力状态、干滩长度25 m以内和以外分别处于非静水压力状态和静水压力状态、均处于静水压力状态3种工况。模拟生成的应力云图表明:在3种不同工况下坝体加固前后应力变化不大,应力分布改善不明显,且随着静水压力的比例增大,坝体下部基础开始受拉且受拉区呈长条形发展,从侧面反映出降低浸润线高度是提高坝体稳定性有效合理的方法。

3 stage dam of a tailings dam is located in the vicinity of bedrock bulge, upstream there is asilt layer resembling a puddle, the silt layer has greatly influence the stability of the dam, in theory,effective measures to improve dam stability is to lower the height of the phreatic line or reinforce thedam. The FLAC3D software is used to simulate the pile reinforcement of the tailings dam, the dam isassumed to be in a non hydrostatic state, or within 25 m of dry beach length is in a non hydrostaticstate, or in a hydrostatic state. The simulated stress nephogram shows, under the three different workingconditions, the stress of the dam before and after the reinforcement is little changed, the stressdistribution is not obvious, as the hydrostatic pressure increases, the lower part of the dam begins to bepulled and the tensile zone is becoming longer and longer, reflect from the side, the effective andreasonable way to improve the stability of the dam is to lower the height of the phreatic line.