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采用弹塑性有限元法,计算了陕西关中—黄陵地区边坡潜在滑带内的应力状态,应用莫尔库仑强度理论分析了不同坡高坡度下c、φ值对边坡稳定系数的影响。结果表明:黄土c值对低坡稳定性起控制作用,φ值对高坡稳定性起控制作用,中间有一过渡坡高段,c、φ值对边坡稳定性都有较大的影响,在过渡坡高段黄土边坡失效概率最大,关中—黄陵地区边坡的过渡坡高大约在30 m左右。对于不同坡度的边坡,其破坏机理不同,陡坡滑面浅,坡脚应力严重集中,c发挥效用相对较高;缓坡滑面深,滑面内正应力大,φ发挥效用相对较高。对坡度陡的黄土基坑及公路低边坡,需合理估计c值,而对于坡度较缓的高边坡或滑坡,合理估算φ值更为重要。
Using the elasto - plastic finite element method, the stress state in the potential sliding zone of the slope in Guanzhong - Huangling area of Shaanxi Province was calculated. The effects of c and φ values on the stability coefficient of the slope were analyzed by using the theory of Mohr - Coulomb strength. The results show that the c value of loess plays a controlling role in the stability of low slope, the φ value plays a controlling role in the stability of high slope, and there is a high transitional slope in the middle. The c and φ values have a great influence on slope stability. The failure probability of the loess slope in the transition slope is the highest, and the transition slope of the slope in the Guanzhong-Huangling region is about 30 m. For slopes with different slopes, the failure mechanisms are different. The steep slopes are shallow, the stress at the slopes is serious, and c plays a relatively high utility effect. The slopes of gentle slopes are deep, the normal stresses in the landslides are large, and the effects of φ are relatively high. For steep loess pit slopes and low slopes, the c value should be estimated reasonably. For high slopes or landslides with a gentle slope, it is more important to estimate the φ value reasonably.