中文摘要：

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。

英文摘要：

The stress state in potential slip zone in the loess slopes which exist widespread in Guanzhong to Huanglin area was calculated by using the elastic-plastic finite element method.Furthermore,the effect of c and φ values on slope stability factor with different slope heights was analyzed by employing the Coulomb theory.The results show that（1） Loess slope stability is more influenced by the value of c in lower slopes and more influenced by φ value in higher slopes.In the middle range of slope heights,the values of c and φ influence slope stability about equally.The probability of failure is highest in the middle range of slope heights,and it is about 30 m high in Guanzhong to Huanglin area.（2） There are different failure mechanisms on different slopes.Steep slopes commonly develop shallow sliding surfaces with sharply centralizing stress in slope foot,c value has relatively high influence on slope stability.Gentle slopes develop deep sliding surface with a large normal stress on slip surface.φ value has relatively high influence on slope stability.Excavation of the steep slope in loess foundation and road,a reasonable estimation of c should be taken,while for the gentler slope such as large-scale high slope and landslide φ value is a more important estimation index.