上游式筑坝法尾矿坝的安全系数随堆筑坝高变化分析
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摘要
对于投资较少的上游式尾矿筑坝法而言,在实际的堆积施工过程中,由于很难严格按照设计的坡比进行每一级子坝的堆筑,导致矿方无法及时、真正掌握当前尾矿坝的受力性能和稳定状态。因此,针对某典型尾矿坝剖面,采用迈达斯商业软件试用版对尾矿坝的堆积过程进行了模拟分析,利用强度折减有限元方法对施工当前状态的尾矿坝进行了边坡稳定分析,得到了当前状态尾矿坝的塑性剪应变云图和相对应的抗滑稳定安全系数。比较了尾矿坝安全系数随着子坝堆筑的变化情况,结果发现:随着堆积子坝的进行,尾矿坝的整体抗滑稳定系数逐渐减小,此外在初期坝和一级子坝的下游坡脚处容易出现相对较大的变形。此研究结果为矿部管理部门及时了解尾矿坝的稳定程度和实际生产提供了技术支持。
The upstream embankment method is widely used due to its smaller investment in the construction of tailing dams.However,the designed slope inclination is not strictly observed in the real construction of embankment,which yields the difficulty of administrator to be timely and really familiar with the stability state and mechanical performance of the current tailing dam.One typical tailing dam cross section was employed to perform the finite element analysis by using the MIDAS-trial version software and Strength Reduction Method technique.The factors of safety and plastic shear strain contours of the current tailing dam were obtained from the finite element analysis results of the MIDAS trial version.In order to find the variation of safety factor with the increment of embankment height,the factors of safety were compared against each increment of embankment.The results showed that the safety factor became gradually lower with the increment of embankment and larger deformation was found out in the toes of original tailing dam and first-stage tailing dam.The results can provide the administrator with the timely factors of safety of the current tailing dam and also can serve the real construction of increment of embankment.
The upstream embankment method is widely used due to its smaller investment in the construction of tailing dams.However,the designed slope inclination is not strictly observed in the real construction of embankment,which yields the difficulty of administrator to be timely and really familiar with the stability state and mechanical performance of the current tailing dam.One typical tailing dam cross section was employed to perform the finite element analysis by using the MIDAS-trial version software and Strength Reduction Method technique.The factors of safety and plastic shear strain contours of the current tailing dam were obtained from the finite element analysis results of the MIDAS trial version.In order to find the variation of safety factor with the increment of embankment height,the factors of safety were compared against each increment of embankment.The results showed that the safety factor became gradually lower with the increment of embankment and larger deformation was found out in the toes of original tailing dam and first-stage tailing dam.The results can provide the administrator with the timely factors of safety of the current tailing dam and also can serve the real construction of increment of embankment.
引文
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[10]李亮,董彦飞,宁娜娜,李猛,李雪梅.基于余力矩的边坡临界滑动场方法及应用[J].青岛理工大学学报2,0113,2(1):1-8LI Liang,DONG Yan-fei,NING Na-na,LI Meng,LIXue-mei.The critical slip field method with residualmoment and its application[J].Journal of QingdaoTechnological University2,0113,2(1):1-8
[11]王文星,曹平,刘业科,汪亦显,杨慧.地震条件下尾矿坝稳定性分析[J].中国安全生产科学技术,2006,2(6):58-61WANG Wen-xing,CAO Ping,LIU Ye-ke,WANG Yi-xian,YANG Hui.Analysis on stability of tailing pondunder earthquake[J].Journal of Safety Science andTechnology,2006,2(6):58-61
[12]马池香,秦华礼.基于渗透稳定性分析的尾矿库坝体稳定性研究[J].工业安全与环保2,0083,4(9):32-34MA Chi-xiang,QIN Hua-li.On the dam stability of thetailing pond based on the analysis on seepage stability[J].Industrial Safety and Environmental Protection,2008,34(9):
[2]罗建林,牛跃林,孙浩刚.圆弧条分法在尾矿库安全评价中的应用[J].中国安全生产科学技术,2006,2(3):85-87LUO Jian-lin,NIU Yue-lin,SUN Hao-gang.Safety as-sessment application of circular arc Swedish method intailing pond[J].Journal of Safety Science and Technolo-gy,2006,2(3):85-87
[3]郑欣,许开立,魏勇.尾矿坝溃坝致灾机理研究[J].中国安全生产科学技术2,0084,(5):8-12ZHENG Xin,XU Kai-li,WEI Yong.Study on the disas-ter-causing mechanism of the tailings dam falling[J].Journal of Safety Science and Technology,2008,4(5):8-12
[4]胡明鉴,陈守义,郭爱国,张华.某上游法尾矿坝抗滑稳定性浅析[J].岩土力学,2003,24增:254-258HU Ming-jian,CHEN Shou-yi,GUO Ai-guo,ZHANGHua.Opinions on the gangue-dam anti-slide stability a-nalysis[J].Rock and Soil Mechanics,2003,24(Supp.):254-258
[5]杨丽红,李全明,程五一,王云海.国内外尾矿坝事故主要危险因素的分析研究[J].中国安全生产科学技术2,008,4(5):28-31YANG Li-hong,LI Quan-ming,CHENG Wu-yi,WANGYun-hai.The analysis of main risk factors about tailingsdam accidents at home and abroad[J].Journal of SafetyScience and Technology,2008,4(5):28-31
[6]郑欣,秦华礼,许开立.导致尾矿坝溃坝的因素分析[J].中国安全生产科学技术,20084,(1):51-54ZHENG Xin,QIN Hua-li,XU Kai-li.Analysis of thefactors inducing the tailing dam falling[J].Journal ofSafety Science and Technology,2008,4(1):51-54
[7]李娟,李翠平,李春民,李仲学.支持向量回归机在尾矿坝浸润线预测中的应用[J].中国安全生产科学技术,2009,5(1):76-79LI Juan,LI Cui-ping,LI Chun-min,LI Zhong-xue.Forecasting of infiltration route in tailing dam by SupportVector Regression[J].Journal of Safety Science andTechnology,2009,5(1):76-79
[8]李亮,路世豹,于广明,褚雪松.滑面正应力假设的边坡安全系数计算方法的适用性探讨[J].青岛理工大学学报,2009,30(6):7-11LI Liang,LU Shi-bao,YU Guang-ming,CHU Xue-song.The discussion about the adaptability of the stability ana-lytical method based on the pre-definition of the normalstress on the slip surface[J].Journal of Qingdao Techno-logical University2,009,30(6):7-11
[9]路世豹,李亮,于广明,张拥军.随机多样复合形法及在边坡稳定分析中的应用[J].青岛理工大学学报,2010,31(2):12-16LU Shi-bao,LI Liang,YU Guang-ming,ZHANG Yong-jun.Random Diverse Complex Method and Application ofthe Slope Stability Analysis[J].Journal of Qingdao Tech-nological University,2010,31(2):12-16
[10]李亮,董彦飞,宁娜娜,李猛,李雪梅.基于余力矩的边坡临界滑动场方法及应用[J].青岛理工大学学报2,0113,2(1):1-8LI Liang,DONG Yan-fei,NING Na-na,LI Meng,LIXue-mei.The critical slip field method with residualmoment and its application[J].Journal of QingdaoTechnological University2,0113,2(1):1-8
[11]王文星,曹平,刘业科,汪亦显,杨慧.地震条件下尾矿坝稳定性分析[J].中国安全生产科学技术,2006,2(6):58-61WANG Wen-xing,CAO Ping,LIU Ye-ke,WANG Yi-xian,YANG Hui.Analysis on stability of tailing pondunder earthquake[J].Journal of Safety Science andTechnology,2006,2(6):58-61
[12]马池香,秦华礼.基于渗透稳定性分析的尾矿库坝体稳定性研究[J].工业安全与环保2,0083,4(9):32-34MA Chi-xiang,QIN Hua-li.On the dam stability of thetailing pond based on the analysis on seepage stability[J].Industrial Safety and Environmental Protection,2008,34(9):
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