高尾矿坝的有效应力地震反应分析  

SEISMIC RESPONSE ANALYSIS OF HIGH TAILING DAMS USING EFFECTIVE STRESS FINITE ELEMENT METHOD

作　　者：柳厚祥[1] 廖雪 李宁[3] 余志江[1] 潘旭东[1] 

机构地区：[1]长沙理工大学岩土研究所,长沙410076 [2]湖南省交通厅,长沙410011 [3]西安理工大学岩土工程研究所,西安710048

出　　处：《振动与冲击》2008年第1期65-70,92,共7页Journal of Vibration and Shock

基　　金：湖南省自然科学基金(03JJY3078、04JJ40032);湖南省教育厅重点科研基金(03A006);长沙理工大学基金(30007)资助课题

摘　　要：基于目前尾矿坝分析方法存在的不足,为研究高尾矿坝的动力稳定性和抗液化能力,系统地提出了高尾矿坝的有效应力地震反应分析方法。在工程地质勘察、静动力试验和静力有限元分析的基础上,采用不排水有效应力和排水有效应力法两种地震反应有限元分析方法,探讨高尾矿坝在地震过程中和地震后的孔隙水压力的产生、扩散和消散规律及其加速度、动应力和孔隙水压力的响应值。分析结果表明:坝体内应力均为压应力,其应力水平均小于1.0,安全系数均大于1.0,坝体内每个单元的抗液化安全系数大于1.5。同时,坝体的抗震性能和抗液化能力明显增强,坝顶部液化区的范围和深度大大地减小。Based on the shortcomings of analysis methods for high tailing dams in the world,an effective stress analysis method for seismic response of tailing dams is developed in order to study dynamic stability and anti-liquidizing ability of high tailing dams.According to the results of engineering geological prospecting, static and dynamic test and static analysis of Baizhishan tailing dam of 113.5m high,seismic response analysis adopting undrained and drained effective stress finite element methods are carried out.The law of producing,diffusion and dissipation of seismic pore water pressure during and after earthquake is foud,and the responses of the tailing dam's acceleration,seismic dynamic stress and pore water pressure are obtained.The analysis results show that the interior stress is compressive stress,the average stress level is less than 1.0 and the safety coefficient is greater than 1.0.The safety coefficient of anti-liquidizing of each element in the tailing dam is greater than 1.5 according to the seismic response analysis for the tailing dam by effective stress FEM.In addition,the aseismic and anti-liquidizing ability of the tailing dam are strengthened remarkably,and the range and the depth of the liquidizing area on the top of the dam are reduced greatly.

关 键 词：尾矿坝 地震反应分析 有效应力 抗液化 孔隙水压 消散规律 

分 类 号：O3[理学—力学] TU435[建筑科学—岩土工程]