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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。
Considering the influence of frequency, the seismic inertia force is corrected, and an improved time history analysis method of blasting stability of rock slope is proposed. Combined with the stereopair projection, limit equilibrium and numerical simulation, a comprehensive evaluation method of slope stability combining qualitative and quantitative research is proposed. Take a tungsten rock slope as an example, the above evaluation method is applied. The results show that the greater the frequency of blasting vibration, the more the slope safety factor declines. However, the greater the frequency, the faster the slope dynamic response decay, and the lower the safety factor is. The time-history curves of the safety factor of plane sliding and wedge failure calculated by the limit equilibrium method all fluctuate in the static stability safety factor; the minimum value is greater than 1.3, which is consistent with the finite element calculation. This indicates that there is no risk of overall instability in the slope and that only small-scale collapse or dumping damage may occur. The research results are of great significance to the design and safe operation of open stope.