›› 2018, Vol. 39 ›› Issue (10): 3717-3726.doi: 10.16285/j.rsm.2017.0199

• Geotechnical Engineering • Previous Articles     Next Articles

Analysis of the permanent deformation and stability of high tailings dam under earthquake action

YIN Guang-zhi1, 2, WANG Wen-song1, 2, WEI Zuo-an1, 2, CAO Guan-sen1, 2, ZHANG Qian-gui3, JING Xiao-fei4   

  1. 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. State Key Laboratory of Oil and Gas Pond Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China; 4. College of Safety Engineering, Chongqing University of Science & Technology, Chongqing 401331, China
  • Received:2017-06-22 Online:2018-10-11 Published:2018-11-04
  • Supported by:
    This work was supported by the National Key Research and Development Program of China (2017YFC0804609) and the National Natural Science Foundation of China (51304170, 51404049).

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Abstract: The permanent deformation and dynamic stability of high tailings dam are analyzed by using time-history analysis method, global deformation analysis method (equivalent nodal force method and modulus soften method) and limit equilibrium method with Xiaodae tailings pond as an example. This paper analyzes the influence of length of dry beach, height of tailings dam and seismic acceleration on the safety factor and permanent deformation of tailings dams, and analyzes the time-history change laws of safety factors of tailings dams. It is found that the permanent deformation of the tailings dam is different from that of the general earth-rock dam. The permanent deformation in the horizontal direction of the tailings embankment is greater than that in the vertical direction, and the permanent deformation is not monotonous with the dam height. The minimum safety factor of the tailings dam in the earthquake is linearly related to the influencing factors, and the seismic subsidence at the crest has a nonlinear relationship with the influencing factors. The calculation methods of the minimum average safety factor for seismic safety are improved based on the characteristics of the fluctuation and reduction of the transient safety factors in the earthquake. The results show that the seismic performance of the tailings dam of Xiaodae tailings pond can meet the requirements of the corresponding seismic fortification.

Key words: high tailings dam, dynamic stability, permanent deformation, safety factor, equivalent nodal force method, modulus soften method

CLC Number: 

  • TD 926
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