锚杆对某公路边坡稳定性的影响分析

结合某公路均质土边坡支护实例，运用大型有限元软件MIDAS/GTS建立边坡的平面应变二维模型，基于有限元强度折减法，研究锚杆的锚固长度、锚杆间距、倾角等因素对边坡整体稳定性的影响。结果表明:锚杆穿过边坡滑动面后，继续增加锚杆长度对提高边坡安全系数效果不大，在锚杆倾角和锚杆间距不变的情况下，随锚杆长度增加，边坡安全系数变化较小；在保证边坡稳定性的前提下，锚杆倾角可在25°~35°范围取值；在保持锚杆倾角和锚杆长度不变的情况下，随着锚杆间距的增加，边坡安全系数出现先增大后减小的趋势。

Analysis on Effect of Anchor Bolt on Stability of a Highway Slope

In relation to a supporting example of homogeneous soil slope along highway, the paper established a 2D plane strain model with finite element software MIDAS/GTS, and then by means of finite element strength reduction, studied how the anchorage length of anchor bolt, the bolt spacing and inclination affect the slope stability. The result shows that, after the bolt passes through the slip surface, continuous increase of the bolt length has little effect on increasing the safety factor of high slope; in case of no difference on the bolt inclination and spacing, the safety factor has little change as the bolt length increases; on the premise of slope stability to be ensured, the bolt inclination may find the value between 25°~35°; in case of keeping the bolt inclination and length the same, the safety factor will increase first then decrease as the bolt spacing increases.