Analysis of the dynamic response and stability of fine grained tailings dam by upstream embankment method in the area of high intensity earthquake
WANG Wensong1，2，YIN Guangzhi1，2，WEI Zuoan1，2，JING Xiaofei3，YANG Yonghao1，2，CHEN Yulong4
(1. State Key Laboratory of Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400030，China；
2. College of Resources and Environmental Sciences，Chongqing University，Chongqing 400030，China；
3. College of Safety Engineering，Chongqing University of Science and Technology，Chongqing 401331，China；
4. Department of Civil Engineering，the University of Tokyo，Tokyo 113–8656，Japan)
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.
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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2017, Vol. 36 
