摘要
采用永久变形分析和地震时程分析相结合的综合研究方法,开展某大型现场尾矿坝的稳定性评价。依据尾矿坝场地地震安全性评价结果,确定50年超越概率10%、5%的荷载时程输入曲线;采用修正UBCSAND模型进行隐式非线性分析;采用粘性输入边界,解决动力荷载时程较长时引起计算不收敛的问题;进行尾矿坝的三阶振型特征周期计算;进行基本烈度下永久变形分析,剖析不同坝体标高的变形特征;绘制位移云图并剖析位移变化特征;采用时程+SRM法,计算绘制50年超越概率10%和5%的安全系数时程曲线。根据永久变形和稳定性系数计算结果,综合判定尾矿坝稳定状态,据此对现场尾矿坝提出加固建议。建立的研究方法和成果可为大型尾矿坝稳定性评价工程提供参考。
By comprehensive research method combining permanent deformation and seismic time history analysis, the stability evaluation of a large field tailings bam was conducted. According to the results of seismic safety evaluation of tailings dam engineering sites, the load time history curves of that the exceedance probability while 50 years is 10% and 5% were input. The implicit nonlinear analysis was conducted by modified UBCSAND model. By cohesive input boundary, the calculation convergence problem caused by dynamic load time history was solved. The third order modal characteristics periods of tailings dam were calculated. Permanent deformation was analyzed under basic seismic intensity.Deformation characteristics under different dam elevations were analyzed. Displacement nephogram was drew, variation characteristics were analyzed. By time history and SRM method, the time history curves of that the exceedance probability while 50 years is 10% and 5% were calculated and drew. By permanent deformation and stability index results, the stability state of tailings dam was judged comprehensively, and strengthening suggestion on field tailings dam was put forward. Established research methods and results can provide reference for large tailings dam stability evaluation in site.
作者
郝喆
HAO Zhe(College of Environmental Sciences,Liaoning University,Liaoning Shenyang 110036,China;Nonferrous Geological Exploration and Research Institute,Liaoning Shenyang 110013,China)
出处
《防灾减灾学报》
2018年第4期13-18,共6页
Journal of Disaster Prevention And Reduction
基金
辽宁省百千万人才资助项目(辽百千万立项[2015]33号)
关键词
地震作用
尾矿坝
永久变形
地震稳定性分析
earthquake action
tailings dam
permanent deformation
seismic stability analysis