基于FLAC^(3D)余震对尾矿坝稳定性影响的研究  

The Impact of Aftershocks on the Stability of Tailings Dam based on FLAC^(3D)

作　　者：曹进海 胡军[1] CAO Jinhai;HU Jun(School of Civil Engineering, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China)

机构地区：[1]辽宁科技大学土木工程学院,辽宁鞍山114051

出　　处：《中国钨业》2017年第4期68-73,共6页China Tungsten Industry

基　　金：国家自然科学基金项目(51274053)

摘　　要：针对余震对尾矿坝稳定性的影响问题,以某上游式尾矿坝为例,基于完全非线性有限差分法,从不同余震烈度、网格变形、位移变化及超孔压比等方面对尾矿坝进行数值模拟分析,结果表明:余震对坝体会造成非常严重的破坏,余震产生的位移偏移量大于主震产生的位移偏移量,以监测点B为例,余震结束时产生的水平位移偏移量是主震结束时产生的水平位移偏移量的1.75倍;坝体位移偏移量的大小跟余震的烈度有关,余震烈度越大,坝体的偏移量就越大;当坝体内土体处于饱和时,余震发生时坝体内超孔压比能够迅速达到主震作用时的超孔压比值,尤其当强余震作用时这种现象更为明显,从而证明余震对坝体的稳定性是有较大影响的,其分析结果可为后续尾矿坝的抗震设计及坝体的防灾减灾提供参考依据。In light of the influence of aftershocks on the stability of tailings dams,this paper studies performs numerical simulation analysis of an upstream tailings dam from the aspects of aftershock intensity,grid deformation,displacement change and excess pore pressure ratio.The results show that the aftershocks cause very serious damage to the dam for the displacement caused by aftershocks is greater than that of the main shock.Taking the monitoring point B as an example,the horizontal displacement generated at the end of the aftershock is1.75times generated at the end of the main shock.The greater the aftershock magnitude is,the greater the displacement of the dam will be.When the soil in the dam is saturated,the overpressure ratio in the dam after the aftershock can quickly reach the overpressure ratio when the main shock is applied,especially under the conditions of strong aftershocks.It shows that the aftershock has a large impact on the dam stability.The results provides favorable reference for the seismic design,disaster prevention and reduction of tailings dam.

关 键 词：尾矿坝 完全非线性 超孔压比 余震 FLAC3D 坝体稳定性 

分 类 号：TD926.4[矿业工程—选矿]