Instability characteristics and stability analysis of a tailings dam based on fluid-solid coupling theory

LI Qiang; ZHANG Li-ting; QI Qing-lan; ZHOU Zhan-lei

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Instability characteristics and stability analysis of a tailings dam based on fluid-solid coupling theory

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- Instability characteristics and stability analysis of a tailings dam based on fluid-solid coupling theory
- Vol. 33, Issue S2, (2012)
- 作者机构：
  
  1. 石家庄铁道大学土木工程学院,石家庄,050043
  2. 石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,石家庄,050043
- 作者简介：
- 基金信息：
- DOI：
  CLC： TV3
- Online First：11 December 2012，
  
  Published：2012
- 稿件说明：
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LI Qiang, ZHANG Li-ting, QI Qing-lan, et al. Instability characteristics and stability analysis of a tailings dam based on fluid-solid coupling theory[J]. 2012, 33(S2).
DOI：

LI Qiang, ZHANG Li-ting, QI Qing-lan, et al. Instability characteristics and stability analysis of a tailings dam based on fluid-solid coupling theory[J]. 2012, 33(S2). DOI：

摘要

选用典型的尾矿库工程实例，采用流固耦合和强度折减法相结合对其尾矿坝进行稳定性分析，确定尾矿库渗流场分布及浸润线的位置，该浸润线位置与实测浸润线位置吻合较好。建议强度折减过程中尾矿坝的失稳准则，计算安全系数，确定潜在滑裂面的位置，并与极限平衡法计算出的安全系数及临界滑裂面位置进行比较，表明强度折减法得出的结果与Bishop法结果接近，流固耦合-强度折减法在尾矿库稳定性分析的可行性。在该基础上研究尾矿坝潜在的失稳模式，将尾矿坝潜在的失稳模式分为局部失稳和整体性失稳两种，局部失稳为尾矿坝的部分坝面发生滑移，整体失稳为整个尾矿坝坝体发生失稳，并分析导致该尾矿坝两种失稳模式的主要因素，认为浸润线埋深过浅是导致局部失稳的主要原因。

Abstract

The stability analysis for a typical tailings dam is carried out by combining the fluid-solid coupling method with the strength reduction method. Then the seepage field

the location of potential sliding surface and the safety factor are determined; and the tailings dam failure criterion in strength reduction method for tailings dam is suggested. By comparison

the location of the saturation line by the above determined seepage field is in accordance with the field measured saturation line; meanwhile

the location of the potential sliding surface and the safety factor is well consistent with the results by Bishop method

so as to show the feasibility of the stability analysis for the tailings dam by combining the fluid-solid coupling method with the strength reduction method. Based on the above results

the instability model of the tailings dam is studied; and two instability models are concluded

one is the local instability which the instability takes place in the part of the tailings dam sliding; and the other is global instability which can cause the whole tailings dam failure. Moreover the main factors which lead to the two failure models are analyzed; and the result shows the important factor of the local instability is caused by the too shallow saturation line in the tailing dams.

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