土工基础

›› 2014, Vol. 28 ›› Issue (2): 133-137.

• 工程实录 • 上一篇    下一篇

露天采场岩质高边坡爆破稳定性之综合评价

张 登1, 2，简文彬1, 2   

  1. （1.福州大学 环境与资源学院，福州 350108；2.福州大学 岩土工程与工程地质研究所，福州 350108）
  • 收稿日期:2013-05-15 出版日期:2014-04-21 发布日期:2014-04-25
  • 作者简介:张登（1989-），男，硕士研究生，研究方向为岩土工程。
  • 基金资助:

    基金项目：国家自然科学基金(41072232)、福建省自然科学基金（2010J01254）

Stability of High Open Pit Rock Slopes under Blast Loading

ZHANG Deng1, 2, JIAN Wenbin1, 2   

  1. (1. College of Environment and Resources, Fuzhou University, Fuzhou, 350108;
    2. Institute of Geotechnical and Geological Engineering, Fuzhou University, Fuzhou, 350108)
  • Received:2013-05-15 Online:2014-04-21 Published:2014-04-25

摘要： 考虑频率的影响，对地震惯性力加以修正，提出一种改进的岩质边坡爆破稳定性时程分析法。结合赤平投影、极限平衡和数值模拟法提出定性和定量研究相结合的边坡稳定性综合评价方法。以某钨矿岩质边坡为例，对上述评价方法加以应用。研究结果表明,爆破振动频率越大，边坡安全系数下降越多。但由于频率越大边坡动力响应衰减越快，安全系数下降幅度有限。用极限平衡法计算的平面滑动和楔体破坏安全系数时程曲线都在静力稳定安全系数上下波动；其最小值大于1.3，与有限元计算结果相吻合。这表明边坡不存在整体失稳的危险，仅可能发生小范围的崩塌或倾倒破坏。研究结果对露天采场设计和安全运营有重大意义。

关键词: 岩质高边坡, 爆破振动, 改进时程法, 综合评价

Abstract: Instabilities are prone to be induced under the blast loading for the high rock cut slopes in open pit mines. An improved method, which considering the frequency effect of the seismic inertia, is used in the time history analysis of the rock slope stability under the blast load. Combined with kinematical method, limit equilibrium method and numerical method, a comprehensive evaluation method for the cut slope stability was proposed. The improved method was applied to evaluate a rock slope of a tungsten mine. The results show that the higher the vibration frequency is, the more the safety factor decreases. But the higher the vibration frequency is, the faster the dynamic response attenuates and the extent of the safety factor reduction is limited. The time history curve of the safety factor of planar and wedge failure calculated by limit equilibrium method fluctuates around the static safety factor. The minimum value of the safety factor is 1.3, which is in accordance with the results of the FEM method. All of these indicate that the general failure of the slope is unlikely, but toppling or rockfall failure of small scale is probable.

Key words: High Rock Slopes, Blasting Vibrations, Improved Time History Analysis, Comprehensive Evaluations