地震作用下某尾矿坝三维动力稳定性分析
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摘要
应用Fortran语言进行ABAQUS二次开发,编写邓肯-张E-υ模型和等效黏弹性的Umat子程序。在此基础上,采用有效应力法对尾矿坝进行三维动力反应及液化分析,计算了正常运行工况下辽宁省北票某尾矿坝在水平地震波影响下的加速度、动剪应力、动孔压增长模式及液化区的发展趋势。结果表明:尾矿坝沿坝轴方向加速度最大值出现在距坝底3/4高度处的堆积坝坡面上,放大系数为1.82;坝体最大动剪应力呈层状分布,由坡内向坡外逐渐减小,且数值不是很大;动孔压增长为不规则曲线上升模式,在2～6 s的强震区起伏变化较大,之后趋于平缓;液化区主要集中在沉积滩浅层区域和坝体顶部浸润面以下区域,未贯穿整个坝体。
Based on secondary development of abaqus with the application of Fortran language,the Duncan E-υ model and the equivalent viscoelastic Umat subroutine are prepared.The 3D dynamic response and liquefaction analysis of tailings dam are made by the effective stress method.The acceleration,dynamic shear stress,the trend of the dynamic pore pressure and liquefaction zone of the Beipiao tailings dam in Liaoning province under normal conditions are calculated.The result of the dynamic computation shows that the magnification factor of along dam axis direction acceleration is 1.82 and the maximum values is on the slope surface of the embankment of 3/4 height of the dam;the maximum dynamic shear stress,which shows layered distribution,decreases gradually from the inside slope to the outside slope;dynamic pore pressure increases as irregular curve patterns,in the 2～6 s meizoseismal area undulated greatly,then leveled off.The liquefaction zone is mainly concentrated in the deposited beach shallow area and following the top of the dam infiltration,and not through the dam.
Based on secondary development of abaqus with the application of Fortran language,the Duncan E-υ model and the equivalent viscoelastic Umat subroutine are prepared.The 3D dynamic response and liquefaction analysis of tailings dam are made by the effective stress method.The acceleration,dynamic shear stress,the trend of the dynamic pore pressure and liquefaction zone of the Beipiao tailings dam in Liaoning province under normal conditions are calculated.The result of the dynamic computation shows that the magnification factor of along dam axis direction acceleration is 1.82 and the maximum values is on the slope surface of the embankment of 3/4 height of the dam;the maximum dynamic shear stress,which shows layered distribution,decreases gradually from the inside slope to the outside slope;dynamic pore pressure increases as irregular curve patterns,in the 2～6 s meizoseismal area undulated greatly,then leveled off.The liquefaction zone is mainly concentrated in the deposited beach shallow area and following the top of the dam infiltration,and not through the dam.
引文
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[2]沈楼燕,魏作安.探讨矿山尾矿库闭库的一些问题[J].金属矿山,2002(12):47-48.
[3]魏作安.细粒尾矿及其堆坝稳定性研究[D].重庆:重庆大学,2004.
[4]《尾矿设施设计参考资料》编写组.尾矿设施设计参考资料[M].北京:冶金工业出版社,1980.
[5]周健,徐志英.土(尾矿坝)的三维有效应力动力反应分析[J].地震工程与工程振动,1984(9):60-64.
[6]殷宗泽.土体本构模型剖析[J].岩土工程学报,1996,18(4):95-97.
[7]李广信.高等土力学[M].北京:清华大学出版社,2009.
[8]顾淦臣,沈长松,岑威钧.土石坝地震工程学[M].北京:中国水利水电出版社,2009.
[9]沈珠江.砂土动力变形计算参数的室内测定[J].水利水运科学研究,1984(2):10-18.
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