强震条件下陡底坡尾矿坝动力稳定性分析
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摘要
沟底纵坡是尾矿库选址中考虑的重要因素之一。针对高地震烈度区、陡底坡上游法尾矿坝,采用有限元法对尾矿坝动力响应及稳定性进行分析,研究了坝体动力加速度、地震永久变形、液化情况及动力抗滑稳定性。结果表明:9度地震条件下,陡底坡尾矿坝动力响应较大,坝顶加速度放大系数2.16倍,坝体沉陷及向下游方向位移较大,液化区主要集中在库内浸润线以下尾砂层内,动力抗滑稳定安全系数1.065,能够满足动力稳定要求。研究成果可为类似工程的研究及设计提供参考。
The ratio of base slope is one of the important factors during damsite selecting of tailings dam.Based on one upstream tailings dam located on steep slope in high seismic intensity area,the dynamic response and dam stability ware studied by using the method of FEM.The response of acceleration,permanent deformation,liquefaction region and stability of dam in the condition of grade 9.0 earthquake intensity ware analyzed in detail.The results show that under the earthquake with M=9.0,the response of acceleration of tailings dam is more with amplification coefficient of 2.16 times,the larger permanent deformation and displacement toward downstream also appeared on the top of dam,the liquefaction region appeared in tailings under saturation line in the pond,the minmum safety factor of the dynamic time history is 1.065,which can meet the specification.The results can provide reference for similar engineering research and design.
The ratio of base slope is one of the important factors during damsite selecting of tailings dam.Based on one upstream tailings dam located on steep slope in high seismic intensity area,the dynamic response and dam stability ware studied by using the method of FEM.The response of acceleration,permanent deformation,liquefaction region and stability of dam in the condition of grade 9.0 earthquake intensity ware analyzed in detail.The results show that under the earthquake with M=9.0,the response of acceleration of tailings dam is more with amplification coefficient of 2.16 times,the larger permanent deformation and displacement toward downstream also appeared on the top of dam,the liquefaction region appeared in tailings under saturation line in the pond,the minmum safety factor of the dynamic time history is 1.065,which can meet the specification.The results can provide reference for similar engineering research and design.
引文
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[2]潘建平.尾矿坝抗震设计方法及抗震措施研究[D].大连:大连理工大学,2007.
[3]VICK S G.Risk based approach to seismic stability and Inundation Hazard for upstream tailings dams[C]∥Proceedings of International Symposium on Safety and Rehabilitation of Tailings Dams.1990.
[4]《中国有色金属尾矿库概论》编委会.中国有色金属尾矿库概论[R].中国有色金属工业总公司.1992:252-257.
[5]张超,杨春和,白世伟.尾矿料的动力特性试验研究[J].岩土力学,2006(1):35-40.
[6]周汉民.库水位对尾矿坝抗震液化稳定性的影响分析[J].中国矿业,2011,20(10):103-106.
[7]何淼,刘恩龙,刘友能.地震动荷载作用下尾矿坝动力分析[J].四川大学学报:工程科学版,2016,48(S1):33-38.
[8]朱亚林,孔宪京,邹德高,等.河谷地形对高土石坝动力反应特性影响的分析[J].岩土工程学报,2012,34(9):1590-1597.
[9]魏作安,万玲.细粒尾矿堆积坝的地震稳定性分析[J].有色金属,2006(1):79-81.
[10]赵剑明,常亚屏,陈宁.高心墙堆石坝地震变形与稳定分析[J].岩土力学,2004(S2):423-428.
[11]崔旋,周汉民,甘海阔.废石中线法在强震区高尾矿坝建设中的应用[J].有色金属:矿山部分,2015,67(6):104-106,111.
[12]么伦强,牛志伟,侯世超.地震高烈度区尾矿坝抗震有限元分析[J].水利水电技术,2017,48(2):45-49,55.