《Canadian Geotechnical Journal》刊登“采用堆石堤坝加固的上游尾矿坝的数值分析”

作者：Ormann, Linda；Zardari, Muhammad Auchar；Mattsson, Hans；Bjelkevik, Annika；Knutsson, Sven

刊物：《Canadian Geotechnical Journal》，2013年6月，第50卷第4期，391-399页

关键词：固结；优化；堆石护堤；边坡稳定；分期施工；尾矿坝；

摘要：由于上游尾矿坝的固结过程比较缓慢，随着坝体的升高，超孔隙压力的增加会降低坝体的稳定性。但可以通过在下游面修筑堆石护堤来加强坝体的安全稳定性。本文介绍了一项关于堆石护堤加固上游尾矿坝的案例研究。通过有限元分析，模拟大坝分期施工和优化堆石护堤的体积。大坝分11个阶段升高；每一个阶段包括筑坝阶段和固结阶段。研究表明，大坝在坝体升高阶段由于超孔隙压力的增加而使边坡稳定性降低。通过在下游侧修筑堆石护堤可以成功改善大坝的稳定性。使堆石护堤体积优化技术可以在成本最小的前提下获得要求的稳定性。本文研究表明，在模拟上游尾矿坝的固结过程和保证坝体稳定性的前提下获得堆石护堤最优体积的优化过程中，有限元法是一种有用的工具。

Numerical analysis of strengthening by rockfill embankments on an upstream tailings dam

Authors：Ormann, Linda；Zardari, Muhammad Auchar；Mattsson, Hans；Bjelkevik, Annika；Knutsson, Sven

Journal：Canadian Geotechnical Journal. Jun2013, Vol. 50 Issue 4, p391-399.

Key Word：consolidation；optimization；rockfill berms；slope stability；staged construction；tailings dams

Abstract：The consolidation process could be slow in an upstream tailings dam; therefore, the stability can reduce due to an increase in excess pore pressures when the dam is raised. The safety of the dam can be enhanced by constructing rockfill berms on the downstream side. This paper presents a case study on the strengthening of an upstream tailings dam with rockfill berms. The finite element analyses were performed for modeling the staged construction of the dam and for optimizing the volume of the rockfill berms. The dam was raised in 11 stages; each stage consisting of a raising phase and a consolidation phase. The study shows that the slope stability of the dam reduced due to an increase of excess pore pressures during the raising phase. The stability of the dam was successfully improved by utilizing rockfill berms as supports on the downstream side. A technique has been presented to minimize the volume of the rockfill berms so that the required stability can be achieved at minimum cost. This paper shows that the finite element method can be a useful tool for modeling the consolidation behaviour of an upstream tailings dam and minimizing the volume of the rockfill berms that may be needed to maintain the stability of the dam during staged construction.

原文链接：https://vpn2.nlc.gov.cn/prx/000/http/web.ebscohost.com/ehost/detail?vid=4&sid=ac043b4f-a1de-4aa4-84bc-46bb6fdf2013%40sessionmgr114&hid=124&bdata=Jmxhbmc9emgtY24mc2l0ZT1laG9zdC1saXZl#db=a9h&AN=87095759