论文部分内容阅读
核桃箐尾矿库位于中甸—大理地震带,其抗震设防烈度为8度,且入库尾矿为细粒尾矿。为论证其采用上游式工艺进行筑坝的可行性,综合运用堆坝模型试验、土工测试、理论分析和数值模拟等多种方法,对其动力反应与静、动力稳定性进行了系统研究。结果表明,通过高筑初期坝、合理设置排渗设施并增设块石贴坡,可以使核桃箐尾矿库尾矿坝的静、动力稳定性达到规范要求,从理论上证明了通过采取合适的抗震措施,在8度地震区的细粒尾矿库采用上游法筑坝是可行的。研究中还发现,由于动孔隙水压力的产生和增长,尾矿坝的动力安全系数在地震过程中呈波动下降的趋势。较大的永久变形是细粒尾矿堆坝的主要震害形式之一,当干滩面长度和安全超高不足时,震后容易发生漫坝事故。并从细观角度,对细粒尾矿堆坝颗粒分级不明显、浸润线埋深浅、滩面坡度缓等特点的成因进行了分析。
Walnut tailings tailings in the Zhongdian - Dali seismic zone, the seismic fortification intensity of 8 degrees, and the tailings into the fine tailings. In order to demonstrate its feasibility of damming with upstream technology, the dynamic response, static and dynamic stability of the dam are systematically studied by comprehensively applying various methods such as dam-dam model test, geotechnical test, theoretical analysis and numerical simulation. The results show that the static and dynamic stability of the tailings dam of walnut 箐 tailings dam can meet the standard requirements by building the initial drainage dam and setting up the drainage facilities properly and adding the blocks and slope. It is theoretically proved that by adopting a suitable It is feasible to use the upstream method to dam-stop the fine-grained tailings dam in the 8 degree earthquake area. The study also found that due to the dynamic pore water pressure generation and growth, tailings dam dynamic safety factor showed a downward trend during the earthquake. Larger permanent deformation is one of the main forms of damage for the tailing dam of a fine-grained tailing dam. When the dry-land length and safety overshoot are insufficient, a dam-over accident is easily occurred after the earthquake. And from the perspective of microscopic analysis, the causes of the grading of the tailings dam are not obvious, the depth of the infiltration line is shallow, and the slope of the beach is gentle.