Permanent displacement analysis and stability assessment of a tailings dam under seismic effects

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Jun.2025, Vol.48 No.6: 839-845

DOI: 10.3969/j.issn.1003-5060.2025.06.020

Authors

SHEN Xin $ ^{1} $, GUO Zhaoqiang $ ^{2} $, HUANG Xudong $ ^{1} $, GAO Yong $ ^{1} $, YU Jiaji $ ^{3} $, PAN Qiujing $ ^{3} $

(1. China Civil Engineering Construction Corporation, Beijing 100038, China; 2. China Railway Construction Corporation Limited, Beijing 100855, China; 3. School of Civil Engineering, Central South University, Changsha 410075, China)

Abstract and Keywords

Abstract: Taking the tailings dam of a project in Indonesia as a case study, a method for calculating seismic-induced foot displacement of the dam is proposed, based on a discrete mechanism combined with the upper-bound method and the Newmark method. The influence of the dam's geometric parameters and soil strength characteristics on the stability of the dam is also investigated. The results show that under design seismic motion, the foot displacement of the most critical sliding surface of the dam is 0.12 cm. The slope angle of the dam significantly affects foot displacement; as the slope angle increases to $ 25^{\circ} $, the dam reaches the defined instability threshold. With an increase in dam height, the foot displacement initially increases rapidly before stabilizing, indicating the need for careful height design to balance stability and cost-effectiveness. An increase in the internal friction angle significantly enhances the seismic resistance of the dam, particularly when using moderately weathered materials. A higher internal friction angle reduces post-seismic foot displacement and improves seismic stability of the dam. The seismic displacement behavior of the dam, considering the linear increase of soil cohesion with depth, is analyzed. It is found that accounting for non-homogeneous cohesion results in smaller displacement calculations, which are not overly conservative. The findings provide guidance for the design and construction of tailings dams.

Keywords: tailings dam; seismic; Newmark displacements; stability; upper-bound analysis

作者信息

沈欣 $ ^{1} $，果召强 $ ^{2} $，黄旭东 $ ^{1} $，高永 $ ^{1} $，余家骥 $ ^{3} $，潘秋景 $ ^{3} $

（1. 中国土木工程集团有限公司，北京 100038；2. 中国铁道建筑集团有限公司，北京 100855；3. 中南大学土木工程学院，湖南长沙 410075）

摘要和关键词

摘要: 以印度尼西亚某项目尾矿坝为例,文章基于离散机制,结合极限分析上限法及 Newmark 法,提出一种地震作用下尾矿坝坝脚位移的计算方法,探究坝体几何参数和土体强度参数对尾矿坝稳定性的影响。结果表明:在设计规范地震动下,该项目尾矿坝最危险滑动面坝脚位移为 0.12 cm;尾矿坝倾角对坝脚位移影响显著,随着倾角增大至 $ 25^{\circ} $,坝体达到界定失稳标准;随着尾矿坝高度增大,坝脚位移迅速增大后趋于平缓,需合理设计高度以平衡稳定性和经济性;内摩擦角的增大会显著提高坝体的抗震能力,尤其在使用中风化石料时,内摩擦角较高能有效减少震后坝脚位移,提升尾矿坝的地震稳定性。分析了土体黏聚力随深度线性增大情况下的尾矿坝震后位移变化规律,考虑黏聚力非均匀性导致位移计算值偏小,不趋于保守。该研究结果对尾矿坝的设计和施工具有一定指导作用。

关键词: 尾矿坝；地震；Newmark位移；稳定性；上限分析

Funding

国家自然科学基金资助项目（52378424）

合肥工业大学学报(自然科学版)

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