细粒尾矿堆积坝排渗加筋联合加固技术研究

Stability Analysis of Fine-grained Tailings Dam afterusing of Reinforced Drain Board

尾矿堆积坝稳定与库区下游居民的生命财产及周边环境息息相关。依托贵州某细粒尾矿堆积坝,采用强度折减法,开展了不同支护方案下尾矿坝稳定性分析。结果表明,当采用研发的新型排渗加筋复合构件对新筑堆料进行加固后,坝体的潜在滑动面由表层向坝体内部转移。新型复合构件加固效果与新筑填料高度相关,当新筑堆料高度为3.5 m时,坝体安全系数增大了6.4%;当新筑堆料高度为30 m时,坝体安全系数增大了25%。研究成果验证了排渗加筋支护的良好效果,对类似尾矿坝设计具有借鉴意义。

The stability of the tailings dam is closely related to the safety of people and properties of the downstream residents in the reservoir area and the surrounding environment.Based on the geological conditions of a fine-grained tailings dam in Guizhou,the strength reduction method is used to identify the stability analysis of the dam under different support schemes.The results show that the potential sliding surface of the dam is transferred from the surface to the interior of the dam after reinforcing with proposed drain board.The reinforcement effect of the drain board is related to the height of the newly built filler.When the height of the newly built stacking material is 3.5 m,the safety factor of the dam increases by 6.4%;when the height of the additional silt filler is 30 m,the dam safety factor increases by 25%.The results verify the feasibility of the proposed drain board.