露天矿高边坡破坏机理研究的强度折减法

Damage Mechanism Research on High Slope Stability of Open-pit Mine Based on Strength Reduction Method

依据岩质边坡渐进破坏特征,应用有限元强度折减方法,利用RFPA模拟软件建立了露天矿边坡的数值分析模型,模拟边坡失稳的全过程,计算出不同高度和坡角下的强度储备安全系数,获得了安全系数与边坡高度和角度之间的变化关系,分析了不同边坡的破坏特征与稳定性的演化规律。研究结果表明:边坡的破坏位置和滑坡类型与边坡的高度有关,中低边坡、高边坡、超高边坡所采取的防治措施不尽相同;强度储备安全系数会随着边坡的变高、变陡而逐渐减小;当边坡高度大于500 m时,由于发生整体滑坡的趋势下降,安全系数的下降速率变缓。

According to rock slope,s features of progressive failure,the strength reduction method of finite elements is applied to establish a mechanical model for different height slopes by using RFPA simulation software,simulate the course of slope instability,calculate the safety factors of slope under different height and angle,so as to gain the relationship between safety factor,slope heights and angle,and analyze features of different heights landslides and evolvement rule of stability.The results show that： The location of the slope failure and the type of landslide are related to the height of slope. Therefore,the prevention and control measures taken for the medium-low slope,the high slope and the ultra-high slope are not the same;The safety factor of slope will gradually decrease with the increase of height and angle;When the slope height is greater than 500 m,the decline rate of safety factor will slow down because of the declining trend of overall landslide.