Stability analysis of expansive soil slope and its slope remedeations

It is easy to induce landslides for cut slope in expansive soil region, especially after lasting rainfall. Its landslide characteristics are shallow layer and small scale. It is well known to us that Bishop's simplified method of slices and so on is used for calculating stability factor of common earth slope. Due to many cracks and fissures occurring in the surface of the slope the strength in the superficial layer drops considerably. Anisotropic mechanical behavior, on the other hand, is showed. In order to analyze these effects uniform cracks are presumed to distribute in superficial layer of the slope, and inter-slide forces are changed. The slope, which comprises the superficial part containing many cracks and the non-crack part, is divided into two layers. These calculating results are compared and analyzed to indicate that cracks and fissures in superficial layers exert an influence on the slope stability factor. Meanwhile, reinforcement measures for expansive soil cut slope are list and compared. It is suggested that anchor frame beam be a good method for strengthening the slope, and that more attentions be pay to research it.