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

doi:10.13722/j.cnki.jrme.2016.1221

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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。

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	王文松1
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	尹光志1
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	魏作安1
	2
	敬小非3
	杨永浩1
	2
	陈宇龙4

关键词 ：采矿工程, 细粒尾矿, 上游法, 高烈度地震区, 稳定性, 永久变形

Abstract：The present paper focuses on the study of a project called as Hetaojing tailings pond to store fine grained tailings，which is located in the active seismic area of Zhongdian—Dali. The intensity of 8 degree is specified in the design. The feasibility of upstream embankment method for tailings pond with the similar characteristics was investigated. In order to analyze the seismic response and the static and dynamic stability of the tailings dam，an integrated approach was applied，consisting of the embankment model test，geotechnical engineering test，theoretical analysis and numerical simulation. The results show that the static and dynamic stability of tailings dam in Hetaojing tailings pond can be improved to meet the requirements of national codes by means of constructions of a high starter dam，appropriate drainage and fitting the slope with rocks，which confirms the feasibility of upstream embankment method with the appropriate earthquake resistant construction for fine grained tailings pond in seismic area theoretically. It was also found that due to the generation and growth of dynamic pore water pressure，the dynamic safety factors of tailings dams fluctuated and decreased gradually during the earthquake. The excessive permanent deformation is one of the major seismic disaster forms for the fine grained tailings dam. The insufficient length and height clearance of the safety beach makes the overtopping more likely to occur after earthquake. Furthermore，the causes of the characteristics of fine grained tailings dam including the particle size grading，the shallow phreatic line and the gentle beach face were analyzed in mesoscopic view.

Key words： mining engineering fine grained tailings upstream embankment method high-intensity seismic active area stability permanent deformation

引用本文:

王文松1，2，尹光志1，2，魏作安1，2，敬小非3，杨永浩1，2，陈宇龙4. 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[J]. 岩石力学与工程学报, 2017, 36(5): 1201-1214.
WANG Wensong1，2，YIN Guangzhi1，2，WEI Zuoan1，2，JING Xiaofei3，YANG Yonghao1，2，CHEN Yulong4. Analysis of the dynamic response and stability of fine grained tailings dam by upstream embankment method in the area of high intensity earthquake. , 2017, 36(5): 1201-1214.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2016.1221 或 http://www.rockmech.org/CN/Y2017/V36/I5/1201

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