在露天边坡的开挖过程中 ,由于临空面的卸载回弹 ,天然岩体内的初始应力于坡脚附近形成一个明显的应力集中带 ,从而使得坡脚成为边坡失稳的主要部位。有限元法分析结果表明 ,边坡岩体的应力集中 ,受到初始侧向水平应力、边坡高度、坡角和坡底宽的影响 ,其中尤以侧向水平应力的影响最为关键。 During the excavation of the open slope, the initial stress in the natural rock body forms an obvious stress concentration zone near the slope foot due to the unloading rebound of the free surface, which makes the slope foot become the main part of the slope instability . Finite element analysis results show that the stress concentration of slope rock mass is affected by the initial lateral horizontal stress, slope height, slope angle and slope width. Especially the lateral horizontal stress is the most important factor.