The impact of considering the vertical seismic coefficient kv on the pseudostatic slope stability analysis of downstream tailings sand dams

Camilo Morales, Alberto Bard, C. Palma
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Abstract

In Chile, the limit equilibrium analysis under pseudostatic conditions is compulsory according to the Supreme Decree 248 (DS248, 2007), which establishes a minimum factor of safety (FoS) of 1.2 for stability analysis. In Chilean geotechnical practice, it is usually considered just the horizontal seismic coefficient (kh) for the analyses. However, there is a constant discussion about the necessity of applying both horizontal and vertical seismic coefficient (kv) into the analyses. In addition, there is uncertainty about what kv/kh should be considered and the effect that the sense of application (upward or downward) could have on the FoS. This paper presents an analysis of the effect of considering different |kv|/kh from 0 to 1 on both analysis directions for generic downstream tailings sand dam. Based on this, different dam heights, beach lengths and seepage conditions are also analysed. The obtained results show that when both kh and kv are applied, the FoS increase if kv acts downward and decrease when it acts upward. In addition, the effect for |kv|/kh ≤ 0.5 is almost neglectable, especially for kh ≤ 0.15. Furthermore, although a short beach length significantly impacts the FoS, the influence of applying both kh and kv seems to be independent of the beach length
考虑竖向地震系数kv对下游尾砂坝拟静力边坡稳定性分析的影响
在智利,根据最高法令248 (DS248, 2007),伪静态条件下的极限平衡分析是强制性的,该法令规定了稳定性分析的最小安全系数(FoS)为1.2。在智利的岩土工程实践中,通常只考虑水平地震系数(kh)进行分析。然而,人们一直在讨论将水平和垂直地震系数(kv)同时应用于分析的必要性。此外,还不确定应该考虑多少千伏/千赫,以及应用的感觉(向上或向下)可能对FoS产生的影响。本文分析了一般下游尾砂坝在0 ~ 1范围内考虑不同kv /kh对两个分析方向的影响。在此基础上,对不同坝高、滩长和渗流条件进行了分析。结果表明,同时施加kh和kv时,kv向下作用时FoS增大,kv向上作用时FoS减小。此外,当kv /kh≤0.5时,影响几乎可以忽略不计,尤其是当kh≤0.15时。此外,虽然较短的海滩长度显著影响FoS,但施加kh和kv的影响似乎与海滩长度无关
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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