高烈度地震区细粒尾矿上游法筑坝动力反应与稳定性分析

发布时间：2018-07-08 18:55

  本文选题：采矿工程 + 细粒尾矿　； 参考：《岩石力学与工程学报》2017年05期

【摘要】：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。
[Abstract]:Juuqing tailing reservoir is located in the Zhongdian-Dali seismic belt, its seismic fortification intensity is 8 degrees, and the tailings into the reservoir are fine tailing. In order to prove the feasibility of dam construction with upstream technology, the dynamic response, static and dynamic stability of the dam were studied systematically by using various methods, such as dam model test, geotechnical test, theoretical analysis and numerical simulation. The results show that the static and dynamic stability of the tailings dam of Juuqing tailing reservoir can be achieved by setting up the seepage drainage facilities reasonably and adding the block slope at the initial stage of the dam. It is proved theoretically that appropriate anti-seismic measures can be taken to ensure the static and dynamic stability of the tailings dam in Juuqing tailing reservoir. It is feasible to use upstream method to dam the fine tailing reservoir in 8 degree earthquake area. It is also found that the dynamic safety factor of tailings dam fluctuates and decreases during the earthquake due to the generation and increase of dynamic pore water pressure. Large permanent deformation is one of the main seismic damage forms of fine tailing dam. When the length of dry beach surface and the safety of super-high are insufficient, the dam overrun is easy to occur after the earthquake. From the point of view of meso, the causes of the characteristics of fine tailing dam are analyzed, such as the grain classification is not obvious, the depth of infiltration line is shallow, the beach slope is slow, and so on.
【作者单位】： 重庆大学煤矿灾害动力学与控制国家重点实验室;重庆大学资源及环境科学学院;重庆科技学院安全工程学院;东京大学土木工程系;
【基金】：国家自然科学基金资助项目(51404049)~~
【分类号】：TD926.4
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本文编号：2108426